Answer:
C. 2042
Explanation:
trust me I know the answer
In 2042 the Social Security fund will dry up at its current level. The correct option is C.
The answer is not entirely clear, as projections can vary depending on various economic and demographic factors. However, based on the 2021 Social Security Trustees Report, the projected depletion date for the Social Security Trust Fund is 2034. This means that at the current rate of payouts and contributions, the Trust Fund will only be able to pay out about 78% of scheduled benefits after 2034.
Therefore, the closest option to the projected depletion date of the Social Security Trust Fund is C. 2042. However, it is important to note that this projection may change as economic and demographic factors change over time.
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PLEASE HURRYYYYY!!
Two figure skaters skate toward each other then push of each other's hands sending them spinning in the opposite direction opposite. Which one of Newton's laws is this
A 1st
B 2nd
C 3rd
D 4th
Answer:1st
Explanation:and object in motion stays in motion unless acted upon by another object
Two figure skaters skate toward each other then push of each other's hands sending them spinning in the opposite direction opposite; - This is Newton's 3rd law of motion. Hence, option (C) is correct.
What is Newton's third law of motion?Newton's third law states that if object A exerts a force on object B, then object B must apply a force to object A that is equal in magnitude and directed in the opposite direction.
This law illustrates a symmetry in nature whereby forces always occur in pairs and whereby no body can exert a force without also being subjected to one.
When two figure skaters skate toward each other then push of each other's hands, they applied force on each other. As according to Newton's third law of motion every action has equal and opposite reaction, they moves the opposite direction opposite.
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Suppose one night the radius of the earth doubled but its mass stayed the same. What would be an approximate new value for the free-fall acceleration at the surface of the earth?
Answer:
g' = g/4
Explanation:
The value of the free-fall acceleration at the surface of the earth, can be obtained applying Newton's 2nd law, assuming that the only force acting on an object at the surface of the earth, is the one produced by the mass of the Earth, i.e. gravity.This force can be expressed according the Newton's Universal Law of Gravitation , as follows:[tex]F_{g} = G*\frac{m_{x} *m_{E} }{r_{E}^{2} } (1)[/tex]
From Newton's 2nd Law, we have:[tex]F = m* a (2)[/tex]Since the left sides in (1) and (2) are equal each other, both right sides must be equal each other also.Simplifying the mass m, we can write the acceleration a in (2) as the acceleration due to gravity, g, as follows:[tex]g = G*\frac{m_{E} }{r_{E}^{2} } (3)[/tex]
Since G is an universal constant, and the mass mE remains constant, if we double the radius of the Earth, the new value for the acceleration due to gravity (let's call it g'), is as follows:[tex]g' = G*\frac{m_{E} }{(2r_{E})^{2} } =G*\frac{m_{E} }{4*r_{E}^{2} } = g*\frac{1}{4} =\frac{g}{4} (4)[/tex]
Which equation is most likely used to determine the acceleration from a velocity vs. time graph?
Answer:
a = t over delta v.
Explanation:
What is the flash of light commonly associated with thunderstorms called?
a. Downdrafts
b. Updrafts
c. Return stroke
d. Thunder
e. Step-leader
Answer:
C.
Explanation:
Return stroke
A return stroke is termed to be the most visible part of a lightning, which in itself is accompanied by a thunderstorm. Lightning causes thunder, which like I said, is a sound from the shock wave that develops like gases in the areas of the discharge. While experiencing a sudden increase in its pressure. Lightning occurs naturally and is electrically charged.
The speed of revolution of particle going around a circlr is doubled and its angular speed is havled. What happen to the centripetal acceleration?
a) unchanged
b) doubles
c) halves
d) becomes four times
Answer: The correct answer is C
Explanation:
I NEED HELP THIS DUE TODAY! ”What are 12 facts about ENERGY?” 50 points if answered!!
Answer:
The average U.S. home uses about 11,000 kilowatt hours of electricity per year.
Electricity travels at the speed of light – over 186,000 miles per second.
Electricity can be produced from fossil fuels, large hydro power plants, nuclear power plants, or renewables like wind or solar.
Birds and other small animals can perch on power lines without being electrocuted unless they simultaneously touch another line, which would create a complete circuit.
For electricity to come into your home, it travels from generation facilities to a high-voltage switchyard, to transmission lines, to a substation, to a distribution line, to a transformer, to your house.
Geothermal energy comes from the Earth. It consists of hot water and hot rock that’s just a few miles beneath the Earth’s surface, and can go even deeper to very hot molten rock called magma. It’s considered clean and sustainable.
Renewable energy comes from perpetual sources like wind, solar or geothermal. Most electricity, though, is produced from nonrenewable sources like fossil fuels (coal, crude oil, natural gas, and uranium). They are nonrenewable because there is a finite amount of them that were formed from buried remains of plants and animals that lived millions of years ago. They cannot be replenished the way renewable energy sources can.
In the U.S., the areas most favorable for geothermal energy use are in Nevada, Oregon, Idaho, Arizona, Utah, Colorado and New Mexico. Geothermal plants are located where water has seeped into the Earth’s crust, and they force the water back up through permeable rock.
Saving energy can be as simple as switching from incandescent light bulbs to CFL or LED versions.
About 40 percent of energy from all resources is used for electricity, which means that our resources are used more for that purpose than for any other.
CFL bulbs consume 80% less electricity than standard bulbs
Natural Gas Facts
When we think about energy facts, we usually focus on electricity, but our homes use natural gas, too! Natural gas is a gaseous mixture of hydrocarbon compounds used as fuel to generate electricity. In order to be used in your home, it must first be processed and converted into dry natural gas. To learn more about its use in your home, check out the natural gas facts below.
10 Facts about Natural Gas
The main component of natural gas is methane, with butane, propane, ethane, or pentane sometimes included.
The “rotten egg” smell of natural gas is actually added by power companies so that your nose can detect a gas leak. In its initial state, natural gas is colorless and nearly odorless.
Most natural gas is delivered via pipeline; there are enormous networks that deliver it to processing facilities, which then transport it to the end consumer. Along the route, there are compressors and metering stations to monitor pressure, flow, and leaks.
When natural gas is transported between countries, it travels by ship in liquid form. This way, it takes up less volume. Once it reaches land, it is regasified (or returned to gas form) and sent to the pipelines for distribution.
In the U.S., there are more than 2.5 million miles of pipeline used for transporting natural gas directly into homes and businesses.
It’s reported that 85 percent of the natural gas consumed in the United States is produced domestically.
Energy facts suggest that natural gas is one of the cleanest choices for fossil fuels. It produces less carbon and pollution than other fossil fuels.
The natural gas and oil industry employs nearly 10.3 million Americans. That’s equals to about 5.6 percent of all of U.S. employment.
Approximately 66 million homes and 5 million businesses in the U.S. use natural gas as an energy source.
This is one of the more important natural gas facts: transportation is one of the most difficult and fragile aspects to its use. Because the main component to natural gas is methane, which is a potent greenhouse gas, undetected leaks can contribute to climate change.
The "rotten smell" is added to the natural gas so your nose can detect a gas leak
Energy Conservation
What Is Energy Conservation?
Your energy use can really affect your energy bill, and directly impacts the environment. In a world of scarce resources, find out how you can conserve energy and save.
Water Conservation
What Is Water Conservation?
Though water is a renewable resource, fresh clean water is in limited supply. Check out our energy tips for conserving water to benefit the environment –– and your wallet.
Answer:
The average U.S. home uses about 11,000 kilowatt hours of electricity per year.
Electricity travels at the speed of light – over 186,000 miles per second.
Electricity can be produced from fossil fuels, large hydro power plants, nuclear power plants, or renewables like wind or solar.
Birds and other small animals can perch on power lines without being electrocuted unless they simultaneously touch another line, which would create a complete circuit.
For electricity to come into your home, it travels from generation facilities to a high-voltage switchyard, to transmission lines, to a substation, to a distribution line, to a transformer, to your house.
Geothermal energy comes from the Earth. It consists of hot water and hot rock that’s just a few miles beneath the Earth’s surface, and can go even deeper to very hot molten rock called magma. It’s considered clean and sustainable.
Renewable energy comes from perpetual sources like wind, solar or geothermal. Most electricity, though, is produced from nonrenewable sources like fossil fuels (coal, crude oil, natural gas, and uranium). They are nonrenewable because there is a finite amount of them that were formed from buried remains of plants and animals that lived millions of years ago. They cannot be replenished the way renewable energy sources can.
In the U.S., the areas most favorable for geothermal energy use are in Nevada, Oregon, Idaho, Arizona, Utah, Colorado and New Mexico. Geothermal plants are located where water has seeped into the Earth’s crust, and they force the water back up through permeable rock.
Saving energy can be as simple as switching from incandescent light bulbs to CFL or LED versions.
About 40 percent of energy from all resources is used for electricity, which means that our resources are used more for that purpose than for any other.
CFL bulbs consume 80% less electricity than standard bulbs
Natural Gas Facts
When we think about energy facts, we usually focus on electricity, but our homes use natural gas, too! Natural gas is a gaseous mixture of hydrocarbon compounds used as fuel to generate electricity. In order to be used in your home, it must first be processed and converted into dry natural gas. To learn more about its use in your home, check out the natural gas facts below.
10 Facts about Natural Gas
The main component of natural gas is methane, with butane, propane, ethane, or pentane sometimes included.
The “rotten egg” smell of natural gas is actually added by power companies so that your nose can detect a gas leak. In its initial state, natural gas is colorless and nearly odorless.
Most natural gas is delivered via pipeline; there are enormous networks that deliver it to processing facilities, which then transport it to the end consumer. Along the route, there are compressors and metering stations to monitor pressure, flow, and leaks.
When natural gas is transported between countries, it travels by ship in liquid form. This way, it takes up less volume. Once it reaches land, it is regasified (or returned to gas form) and sent to the pipelines for distribution.
In the U.S., there are more than 2.5 million miles of pipeline used for transporting natural gas directly into homes and businesses.
It’s reported that 85 percent of the natural gas consumed in the United States is produced domestically.
Energy facts suggest that natural gas is one of the cleanest choices for fossil fuels. It produces less carbon and pollution than other fossil fuels.
The natural gas and oil industry employs nearly 10.3 million Americans. That’s equals to about 5.6 percent of all of U.S. employment.
Approximately 66 million homes and 5 million businesses in the U.S. use natural gas as an energy source.
This is one of the more important natural gas facts: transportation is one of the most difficult and fragile aspects to its use. Because the main component to natural gas is methane, which is a potent greenhouse gas, undetected leaks can contribute to climate change.
The "rotten smell" is added to the natural gas so your nose can detect a gas leak
Energy Conservation
What Is Energy Conservation?
Your energy use can really affect your energy bill, and directly impacts the environment. In a world of scarce resources, find out how you can conserve energy and save.
Water Conservation
What Is Water Conservation?
Though water is a renewable resource, fresh clean water is in limited supply. Check out our energy tips for conserving water to benefit the environment –– and your wallet.
An apple is dropped from the top of a building and hits the ground 2 seconds later. How tall is the building?
Hello! :)
[tex]\large\boxed{19.6 m}[/tex]
Use the kinematic equation below to solve for the height of the building:
[tex]d = \frac{1}{2} at^{2}[/tex]
Where:
d = distance, or height of the building (m)
a = acceleration due to gravity (9.8 m/s²)
t = time (seconds)
Plug in the given values into the equation:
[tex]d = \frac{1}{2} (9.8)2^{2}\\\\d = \frac{1}{2} (39.2)\\\\d = 19.6 m[/tex]
Two clear but non-mixing liquids each of depth 15 cm are placed together in a glass container. The liquids have refractive indices of 1.75 and 1.33. What is the apparent depth of the combination when viewed from above?
Answer:
The apparent depth d = 19.8495 cm
Explanation:
The equation for apparent depth can be expressed as:
[tex]d = \dfrac{d_1} {\mu_1}+\dfrac {d_2}{\mu_2}[/tex]
here;
[tex]d_1 = d_2 = 15 \ cm[/tex]
[tex]\mu_1[/tex] = refractive index in the first liquid = 1.75
[tex]\mu_2[/tex] = refractive index in the second liqquid= 1.33
∴
[tex]d = \dfrac{15}{1.75}+\dfrac{15}{1.33}[/tex]
[tex]d = 15( \dfrac{1}{1.75}+\dfrac{1}{1.33})[/tex]
[tex]d = 15( 0.5714 +0.7519)[/tex]
d = 15(1.3233 ) cm
d = 19.8495 cm
When will the human brain be fully developed?
A. By age 15
B. The early 20s
C. The late 20s
D. The 30s
Answer:
C.
Explanation:
The human brain isn't fully developed until 25 years of age. Everything is there except for the frontal cortex, which is the last thing to mature. An immature frontal cortex explains the spectrum of teenage behaviors: it's what makes adolescents adolescent, says Sapolsky.
Answer:
25!
Explanation:
Match the scienntist with their accomplishment / discoveries
Answer:
newton - motion, gravity
kepler - orbital paths
brahe - the sun goes around the earth
Explanation:
im not sure about brahe but its the only one that makes sense
A rigid tank contains an ideal gas at 300 kPa and 600 K. Now half of the gas is withdrawn from the tank and the gas is found at 100 kPa at the end of the process. Determine (a) the final temperature of the gas and (b) the final pressure if no mass was withdrawn from the tank and the same final temperature was reached at the end of the process.
On Venus, the atmospheric temperature is a hot 720 K due to the greenhouse effect. It consists mostly of carbon dioxide (molar mass 44 g/mol) and the pressure is 92 atm. What is the total translational kinetic energy of 3 moles of carbon dioxide molecules?
Answer:
The value is [tex]E_t = 17958.2 \ J[/tex]
Explanation:
From the question we are told that
The atmospheric temperature is [tex]T_a = 720 \ K[/tex]
The molar mass of carbon dioxide is [tex]Z = 44 \ g/mol[/tex]
The pressure is [tex]P = 92 \ atm =[/tex]
The number of moles is [tex]n = 3 \ moles[/tex]
Generally the translational kinetic energy is mathematically represented as
[tex]E_t = \frac{f}{2} * n * R T[/tex]
Here R is the gas constant with value [tex]R = 8.314 J\cdot K^{-1}\cdot mol^{-1}[/tex]
Generally the degree of freedom of carbon dioxide in terms of translational motion is f = 3
So
[tex]E_t = \frac{ 3}{2} * 2 * 8.314 * 720[/tex]
=> [tex]E_t = 17958.2 \ J[/tex]
please help me .....explain an experiment of phenomenon of rainfall
Answer:
Hindi ko alam pasensya ka ha godbless
A cylindrical pulley is driven by a belt. The pulley is a cylinder with radius 0.0160 m and mass 2.75 kg. The tension in the belt is 30.0 N.
a. Calculate the torque on the pulley.
b. Calculate the moment of inertia of the pulley.
c. Calculate the angular acceleration of the pulley.
d. If the pulley begins at rest, how long will it take to reach 285 rpm
Answer: 0.48Nm ; 0.000352kgm^-2 ; 1363.6363 rad/sec ;
Explanation:
A cylindrical pulley is driven by a belt. The pulley is a cylinder with radius 0.0160 m and mass 2.75 kg. The tension in the belt is 30.0 N.
a. Calculate the torque on the pulley.
b. Calculate the moment of inertia of the pulley.
c. Calculate the angular acceleration of the pulley.
d. If the pulley begins at rest, how long will it take to reach 285 rpm
Given that :
Radius (r) = 0.0160 m
Mass (m) = 2.75 kg
Tension in belt (F) = 30 N
A.) The Torque on the pulley : circular moment ;
Force * Radius
= 30kg * 0.0160 m
= 0.48 Nm
B.) Calculate the moment of inertia of the pulley.
= 0.5mr²
= 0.5 * 2.75 * 0.0160^2m
= 0.5 * 2.75kg * 0.000256
= 0.000352kgm^-2
C.)angular acceleration :
Torque / moment of inertia
0.48 / 0.000352
= 1363.6363 rad/sec
The period of a satellite circling planet Nutron is observed to be 84 s (seconds) when it is in circular orbit with a radius of 8.0 x 106 m. What is the mass of planet Nutron?
a. 6.2 x 1028 kg
b. 5.0 x 1028 kg
c. 5.5 x 1028 kg
d. 4.3 x 1028 kg
e. 3.7 x 1028 kg
Answer:
d. 4.3 x 10²⁸ kg.
Explanation:
The force that keeps the satellite circling the planet, is the centripetal force, which can be expressed as follows:[tex]F_{c} = m_{s}* \frac{v^{2}}{r} (1)[/tex]
This force is not a different force, is just the net force acting on the satellite towards the planet, which is simply the gravitational force between the planet and satellite masses, that we can write as follows, according the Newton's Universal Law of Gravitation:[tex]F_{g} = G*\frac{m_{s}*m_{p} }{r^{2}} (2)[/tex]
From (1) and (2) as they are equal each other we could get the mass of the planet.However, we don't know the value of the linear speed v, but we know the value of the period T instead.By definition, T is the time needed for the satellite to complete a single circumference of the orbit, so, applying the definition of average velocity, we get:[tex]T = \frac{\Delta s }{v} = \frac{2*\pi *r}{v} (3)[/tex]
Solving (3) for v, replacing the value in (1), and solving finally for mp in (2), we get:[tex]m_{p} = \frac{4*\pi ^{2} *r^{3} }{T^{2}*G} = 4.3e28 kg (4)[/tex]The mass of planet Nutron is ; ( D ) [tex]M_{b} = 4.3 * 10^{28} kg[/tex]
Given data :
Satellite period of circling ( T ) = 84 secs
Radius ( r ) = 8.0 * 10⁶ m
Determine the mass of the planet Nutron
we will apply the equation representing the centripetal force
Centripetal force ( Fc ) = [tex]m_{s} * \frac{v^2}{r} ----- ( 1 )[/tex]
applying Newton's universal law of Gravitation to equation ( 1 )
Fg = [tex]G * \frac{m_{s} * m_{b} }{r^2}[/tex] ------ ( 2 ).
note : equation ( 1 ) equals equation ( 2 )
First step : express T in terms of v and change in position ( Δs )
Given that v ( linear speed ) is unknown
T = Δs / v = [tex]\frac{2\pi r}{v}[/tex] --- ( 3 )
∴ v = [ 2 * π * ( 8 * 10⁶ ) ] / ( 84 )
= 598639.45 m/s
Input result in equation ( 1 ) and solve for the mass of planet Nutron in equation 2
∴ Mass of planet Nutron = [tex]M_{b} = 4.3 * 10^{28} kg[/tex]
Hence we can conclude that The mass of planet Nutron is ; ( D ) [tex]M_{b} = 4.3 * 10^{28} kg[/tex]
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6. Drawing reliable conclusions from scientific evidence is important. Which of the following is a question that you can ask yourself to evaluate the reliability of conclusions and claims made by other scientists? How much money did they spend on their experiment? What evidence supports the claim? Do I like their results? Do I agree with their claim?
Answer:
What evidence supports their claim.
Explanation:
In the end, all that really matters in an experiment, is what scientific evidence supports the claim being made.
Answer:
What evidence supports their claim.
Explanation:
Circus a path along which electric current flows how would changing the battery in a circuit from 9 V to 1.5 V most likely affect the circuit
Please help!!
A person is driving in a circle at 20m/s. Are they accelerating?
Question 2 of 15
The molar mass of a gas is
OA. a constant for all gases
D B. dependent on the type of gas
C. the mass of a mole of the gas
DD. dependent on the temperature
Answer:
I think it's C
Explanation:
Molar mass (M) is equal to the mass of one mole of a particular element or compound; as such, molar masses are expressed in units of grams per mole (g mol–1) and are often referred to as molecular weights. The molar mass of a particular gas is therefore equal to the mass of a single particle of that gas multiplied by Avogadro’s number (6.02 x 1023 ). To find the molar mass of a mixture of gases, you need to take into account the molar mass of each gas in the mixture, as well as their relative proportion.
A circular loop of wire of area 25 cm2 lies in the plane of the paper. An increasing magnetic field B is coming out of the paper. What is the direction of the induced current in the loop?
a. counter-clockwise then clockwise
b. clockwise then counter-clockwise
c. counter-clockwise
d. clockwise
e. There is no current induced in the loop.
Answer:
D clockwise
Explanation:
The direction of the induced current in the loop is in the Clockwise direction
12 points , just need help with this question
Answer:f 30
Explanation: I am not really sure but try this
N
Using the graph below, how many adults do NOT carpool to work?
Transportation to Work
Account
80
ashboard
70
60
50
Dunes
Number of Adults
40
30
Hondar
20
10
DOK
0
Bus
Walk
Car
Carpool
Method of Transportation
cory
2
160
O 15
50
130
Answer:130
Explanation:just answered it
A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. If the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall?
a. 9.8 kN.
b. 8.4 kN.
c. 7.7 kN.
d. 9.1 kN.
e. 1.2 kN.
Given that,
Mass of the object, m = 1.2 kg
Initial speed of the object, u = 8 m/s
Final speed of the object, v = -6 m/s (in opposite direction)
Time, t = 2 ms
To find,
The average force on the object by the wall.
Solution,
Let F be the force. Using Newton's second law of motion,
F = ma, a is acceleration
[tex]F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{1.2\times ((-6)-8)}{2\times 10^{-3}}\\\\=8400\ N[/tex]
or
F = 8.4 N
So, the magnitude of average force in the object by the wall is 8.4 N.
A police officer standing at the side of the road uses a radar emitting frequency of 24.15 GHz. A car is going away from the officer at a speed of 50mph. What will be the difference in frequency of the beam reflected by the car received back by the radar?
a. 4.0 kHz (lower frequency)
b. 1.8 kHz (higher frequency)
c. 4.0 kHz (higher frequency)
d. 1.8 kHz (lower frequency)
Answer:
The correct answer is C
Explanation:
From the question we are told that
The frequency of the radar is [tex]f = 24.15 \ GHz = 24.15 *10^{9} \ Hz[/tex]
The speed of the car is [tex]v = 50 mph = \frac{50}{2.237} = 22.35 \ m/s[/tex]
Generally the difference frequency reflected by the car and the frequency which the radar receives back is mathematically represented as
[tex]\Delta f = \frac{f * 2 * v }{ c }[/tex]
Here c is the speed of light with value [tex]c = 3.0 *10^{8} \ m/s[/tex]
=> [tex]\Delta f= \frac{2 * 24.15 *10^{9} * 22.35}{ 3.0*10^{8}}[/tex]
=> [tex]\Delta f = 4000 \ Hz[/tex]
=> [tex]\Delta f = 4.0 \ kHz[/tex]
Given that the value is positive then it a higher frequency
What would be the coefficient of performance if the refrigerator (operating between the same temperatures) was instead used as a heat pump?
COP =
Complete Question
A certain refrigerator, operating between temperatures of -8.00°C and +23.2°C, can be approximated as a Carnot refrigerator.
What is the refrigerator's coefficient of performance? COP
(b) What If? What would be the coefficient of performance if the refrigerator (operating between the same temperatures) was instead used as a heat pump? COP
Answer:
a
[tex]COP = 8.49[/tex]
b
[tex]COP_1 = 9.49[/tex]
Explanation:
From the question we are told that
The lower operation temperature of refrigerator is [tex]T_1 = -8.00^oC = 265 \ K[/tex]
The upper operation temperature of the refrigerator is [tex]T_2 = 23.2 ^oC = 296.2 \ K[/tex]
Generally the refrigerators coefficient of performance is mathematically represented as
[tex]COP = \frac{T_1}{T_2 - T_1 }[/tex]
=> [tex]COP = \frac{265}{296.2 - 265 }[/tex]
=> [tex]COP = 8.49[/tex]
Generally if a refrigerator (operating between the same temperatures) was instead used as a heat pump , the coefficient of performance is mathematically represented as
[tex]COP_1 = \frac{T_2}{ T_2 - T_1}[/tex]
=> [tex]COP_1 = \frac{296.2}{ 296.2 - 265 }[/tex]
=> [tex]COP_1 = 9.49[/tex]
The coefficient of performance if the refrigerator is used as a heat pump is 9.5.
The given parameters;
initial temperature, T₁ = -8 ⁰C = -8 + 273 = 265 Kfinal temperature, T₂ = 23.2°C = 23.2°C + 273 = 296.2 KThe coefficient of performance if the refrigerator is used as a heat pump is calculated as follows;
[tex]COP = \frac{T_2}{T_2 - T_1}\\\\COP = \frac{296.2}{296.2 - 265} \\\\COP =9.5[/tex]
Thus, the coefficient of performance if the refrigerator is used as a heat pump is 9.5.
"Your question is not complete, it seems to be missing the following information";
A certain refrigerator, operating between temperatures of -8.00°C and +23.2°C, can be approximated as a Carnot refrigerator.
What would be the coefficient of performance if the refrigerator (operating between the same temperatures) was instead used as a heat pump?
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Match the following. Match the items in the left column to the items in the right column.
1. index fossil
study of fossils
2. law of original lateral continuity
study of rock layers and the processes that form them
3. law of superposition
a fossil that is widespread geographically but only occurs in one layer or a small number of layers of rock
4. paleontology
sediment deposited into water will spread in a horizontal and continuous sheet
5. stratigraphy
any undisturbed sequence of layered rocks has the oldest rock on the bottom and newest rock on the top
Answer:
1. A fossil that is widespread geographically but only occurs in one layer or a small number of layers of rock
2. Sediment deposited into water will spread in a horizontal and continuous sheet
3. Any undisturbed sequence of layered rocks has the oldest rock on the bottom and newest rock on the top
4. Study of fossils
5. Study of rock layers and the process that form them
Sorry if any of these are wrong
characteristics of projectile motion.
Answer:
Objects experiencing projectile motion have a constant velocity in the horizontal direction and a constantly changing velocity in the vertical direction. The trajectory resulting from this combination always has the shape of a parabola.
Explanation:
A 4 kg block is pushed up an incline that makes a 30° angle with the horizontal, as shown in the figure. Once the block is pushed a distance of d = 5.0 m up the incline, the block remains at rest.
What is the approximate change in the gravitational potential energy of the block-Earth system when the block is held at rest compared to its original location at the bottom of the incline?
A) OJ
B) 100 J
C) 100/33 J
D) 200 J
Answer:
B) 100 J
Explanation:
Assuming the distance given is measured along the incline, the vertical change in height is (5 m)(sin 30°) = 2.5 m. Then the change in potential energy is ...
∆PE = mg(∆h) = (4 kg)(10 m/s^2)(2.5 m) = 100 J
The force is defined as the product of the mass and the acceleration. The energy stored in an object which is converted into kinetic energy is called potential energy.
The formula for the potential energy is mgh.
The correct answer is B that is 100J.
As the surface is inclined the vertical change in height is[tex](5 m)(sin 30^o) = 2.5[/tex]m.
Therefore the potential energy after solving it is as follows:-
[tex]PE = mg(h) \\= (4 kg)(10 m/s^2)(2.5 m)\\\\= 100 J[/tex]
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What does meaningful learning require the learner to do? 1.Relate new knowledge to what is already known 2.Use rote learning strategies to memorize facts 3.Eliminate prior schema 4.Teach others
Answer: I think the answer is A Relate new Knowledge
Explanation:
It kinda just makes sense.
Answer:
A. Relate new knowledge to what is already known
Explanation:
I took the test
Marie walks to the store, 10 blocks east of home. She returns home for lunch and then goes back to the school in 1.5 hours. What is her displacement? What is her speed?
The speed and displacement are 6.66 m/s and 10 blocks east, respectively. The total distance traveled is larger than the displacement between those two points if an object changes direction while traveling.
Displacement: Is it a distance?
Sometimes people mistakenly believe that distance and displacement are simply two different labels for the same thing. Displacement and distance, however, are two distinct ideas. The overall distance traveled by an object during its voyage will be larger than the displacement if it changes direction.
What does displacement mean in one sentence?
The smallest (straight line) distance between a body's initial location and its final position—represented by an arrow pointing from the starting position to the final position—is referred to as a body's displacement when it moves from one position to another.
Briefing:
speed=10/1.5
=6.66m/s
displacement=10 block toward east.
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