Directions: Read each question carefully and answer
1. When the energy of a substance decreases, the motion of its molecules change. A substance has these 4 characteristics:
1. Molecules moving freely start to slow down
2. Collisions between molecules are less energetic
3. Intermolecular forces have more effect as molecules become closer
4. Molecules start vibrating in fixed positions
Answers
Related Questions
What is the power output of a pump which can raise 60kg of water height to height of 10m every minute
Answers
Answer:
Power = Work Done/time=> Power = 60×10×10/60
=> Power = 6000/60
=> Power = 100 Watt
Hence the power output of a pump is 100 Watts.
Tarzan is hanging onto a vine, while standing on a branch. What will be his speed when he gets to the bottom of the swing if the branch was 6 m above this lowest point of his swing?
Answers
Answer: His weight plus the centripetal force must equal 1170 N
Explanation:
83.0 [g + (v^2 / r)] = 1170
v^2 / 18.0 = (1170 / 83.0) - 9.81
Earth's gravity acts upon objects with a steady force of __________. A. 8. 9 meters per second B. 9. 8 meters per minute C. 8. 9 meters per minute squared D. 9. 8 meters per second squared Please select the best answer from the choices provided. A B C D.
Answers
Answer:
9.8 meters per second squared
Explanation:
Answer:
9.8 meters per second squared
Explanation:
edge
State the basic assumptions of the kinetic theory.
a- All matter is composed of small particles;
b- The particles are in constant motion;
c- Molecules are smaller than atoms.
d- The energy lost in the collisions is negligible.
e- These particles are constantly colliding;
i need help so fast pls im in a exam !!!
Answers
Answer:
option a
Explanation:
a- All matter is composed of small particles.
Explanation:
The following are the basic assumptions of the Kinetic Molecular Theory: The volume occupied by the individual particles of a gas is negligible compared to the volume of the gas itself. ... Gas particles are in a constant state of random motion and move in straight lines until they collide with another body.
A 25.0 kg object moving at +15.0 m/s strikes a 15.0 kg
mass moving at -10.0 m/s. If the 25.0 kg object moves off
at -2.00 m/s, what is the velocity of the 15.0 kg object?
Answers
The final velocity of the 15 kg mass is 18.33 m/s.
Conservation of linear momentumThe final velocity of the 15 kg mass can be determined by applying the principles of conservation of linear momentum as follows;
[tex]m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2\\\\[/tex]
Where;
m₁ is the mass of the first object = 25 kgu₁ is the initial velocity of the first object = 15 m/sm₂ is the mass of the second object = 15 kgu₂ is the initial velocity of the second object = -10 m/sv₁ is the final velocity of the first object = -2 m/sv₂ is the final velocity of the second objectThus, the final velocity of the 15 kg mass after the collision is 18.33 m/s.
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A speeding train slams on the brakes when it sees a car is on the tracks in front of it. It takes the train 25 seconds for it to go from an initial speed of 75 m/s to come to a complete stop. What is the train’s acceleration?
Answers
Answer:
Acceleration of the train is -3 m/s²
Explanation:
Since it stops,
final velocity (v) = 0 m/s
time (t) = 25 seconds
initial velocity(u) = 75 m/s
Now,
accelereation = (v-u)/t
or, a = (0-75)/25
or, a = -75/25
so, a = -3 m/s²
. A 225-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate
Answers
The acceleration of the crate is 1.196 m/s².
What is acceleration?This can be defined as the rate of change of velocity.
To calculate the acceleration of the crate, we use the formula below.
Formula:
a = (F-mgμ)/m................. Equation 1Where:
a = acceleration of the cratem = mass of the crateF = Force applied to the crateμ = Coefficient of frictionFrom the question,
Given:
m = 225 kgF = 710 Ng = 9.8 m/s²μ = 0.20Substitute the values above into equation 1
a = [710-(225×9.8×0.20)]/225a = (710-441)/225a = 269/225a = 1.196 m/s²Hence, The acceleration of the crate is 1.196 m/s²
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How would decreasing the time it takes you to run a certain distance affect your speed? Explain your reasoning.
Answers
Explanation:
The speed is determined by the distance that is traveled by an object during a given amount of time. If the time is decreased, the speed would increase. The reason for this is that time is inversely proportional to the speed of an object.
43.5 kg. Shawn rides his bike 1.3 km in
10.4 min at a constant velocity.
The acceleration of gravity is 9.8 m/s^2.
What is Shawn’s kinetic energy?
Answer in units of J.
Answers
Answer:
K.E is 90.625 J
Explanation:
Data:
Mass = m = 43.5kg
Distance = d = 1.3km = 1300 m
Time = t = 10.4 min = 624 sec
Accelaration = a or g = 9.8
Formula for kinrtic energy
K.E = 1/2mv²
Find velocity
V = d/t = 1300/624 = 2.0833333333333 m/s
Put values in formula
K.E = 1/2 (43.5)(2.084)² = 90.624999999995
Mark brainliest if you understand it
Evidence that the universe is expanding is best provided by the.
Answers
Light from distant stars and galaxies has a Doppler shift, indicating that the universe is expanding (moving away from a central point). Because all matter goes away from the point of origin following a "bang," the Big Bang Theory is possible.
Hope that helps! Have a good day :)
Under which circumstances would protesters’ right to assembly most likely be protected?
if protesters were picketing on an alleged criminal’s front lawn
if protesters were marching on the statehouse in favor of marriage for all
if protesters were inciting others to destroy restaurants serving unhealthy foods
if protesters were throwing rocks at police to prevent arrest
Answers
Answer:
Explanation:
Mob violence is never protected. Organizers are always careful about not letting things get out of hand. Not D
That remark sort of applies to C as well. Property destruction is never protected.
B is something assemblies are allowed to do. So B.
A falls into the same category as C and D. You may not like the fact that he/she is doing something illegal, but you can't take away their privacy.
Answer:
if protesters were marching on the statehouse in favor of marriage for all. choice B
Explanation:
A force has both______ and _______. Question 1 options: Speed and impact Magnitude and direction Motion and speed Direction and motion.
Answers
Answer:
magnitude
and direction
Explanation:
As force is a vector quantity, force has both magnitude and direction.
What is vector quantity?A physical quantity that has both directions and magnitude is referred to as a vector quantity.
A lowercase letter with a "hat" circumflex, such as "û," is used to denote a vector with a magnitude equal to one. This type of vector is known as a unit vector.
The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body.
It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
A spring balance can be used to calculate the Force. The Newton is the SI unit of force.
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On a cosmic calendar, in which the history of the universe is compressed into one year, how long is the average human life span?.
Answers
Answer:
If one were to use 5 billion years as the age of the universe and 75 years as the average human life span then
T = 75 / 5 E9 = 1.5E-8
The number of seconds in a year is 3600 * 24 * 365 = 3.2E7
If t = N * T seconds in a year * fraction of human life span
t = 1.5E-8 * 3.2E7 = .48
A human life span is about 1/2 second compared to the life of the universe if the universe were compressed to a single year
What is the gravitational potential energy of a 2.0-kg book 1.5 m above the floor?
Answers
Answer:
Gravitational potential energy is 29.4 J
Explanation:
Data :
Mass = m = 2 kg
Height = h = 1.5 m
Applying Gravitational Potential formula
U = mgh
U = 2 × 9.8 × 1.5
U = 29.4 J
A certain 800-kg car has a motor whose power output is
30 kW. If the car is carrying two passengers whose total mass
is 150 kg, how long will it need to accelerate from 70 to 110
km/h?
Answers
Based on the relationship between power and time, the time required is 10.67 seconds
What is the time required for the car to accelerate from 70 to 110 km/h?Force produced by the car = mass × acceleration
Force produced by the car engine = 30 kW = 3000 kW
mass of car = 800 Kg
acceleration of car = changein velocity / time
acceleration = 110 - 70/t = 40/t
3000 = 800 × 40/t
t = 32000/3000
time, t = 10.67 seconds
Therefore, the time required is 10.67 seconds
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A velocity-time graph shows how ____ changes over time.
Answers
Please help! thank you!
Answers
Answer:
A: The kinetic energy of the two vehicles is transferred to potential energy when it stops.
B: The more mass an object has the more kinetic energy it will have.
Explanation:
This may be the right answer for your question but if it isn't my bad.
What is the frequency of a wave with speed 3m/s and wavelength 6m?
(please with an explanation i'm stoopid) <3
Answers
The frequency of the radio wave is
1
×
10
8
H
z
Explanation:
Let's use the this formula:
C
=
λ
×
v
C represents the speed of light, which has a value of approximately
3.00
×
10
8
m
s
λ
represents the wavelength and the units should be in meters.
v represents the frequency, which should have units of
H
z
or
s
−
1
. Hz is hertz or reciprocal seconds.
Now let's rearrange the equation to solve for v:
C
λ
=
v
v
=
3.00
×
10
8
m
s
/
(
3
m
)
=
1
×
10
8
s
−
1The frequency of the radio wave is
1
×
10
8
H
z
Explanation:
Let's use the this formula:
C
=
λ
×
v
C represents the speed of light, which has a value of approximately
3.00
×
10
8
m
s
λ
represents the wavelength and the units should be in meters.
v represents the frequency, which should have units of
H
z
or
s
−
1
. Hz is hertz or reciprocal seconds.
Now let's rearrange the equation to solve for v:
C
λ
=
v
v
=
3.00
×
10
8
m
s
/
(
3
m
)
=
1
×
10
8
s
−
1The frequency of the radio wave is
1
×
10
8
H
z
Explanation:
Let's use the this formula:
C
=
λ
×
v
C represents the speed of light, which has a value of approximately
3.00
×
10
8
m
s
λ
represents the wavelength and the units should be in meters.
v represents the frequency, which should have units of
H
z
or
s
−
1
. Hz is hertz or reciprocal seconds.
Now let's rearrange the equation to solve for v:
C
λ
=
v
v
=
3.00
×
10
8
m
s
/
(
3
m
)
=
1
×
10
8
s
−
1The frequency of the radio wave is
1
×
10
8
H
z
Explanation:
Let's use the this formula:
C
=
λ
×
v
C represents the speed of light, which has a value of approximately
3.00
×
10
8
m
s
λ
represents the wavelength and the units should be in meters.
v represents the frequency, which should have units of
H
z
or
s
−
1
. Hz is hertz or reciprocal seconds.
Now let's rearrange the equation to solve for v:
C
λ
=
v
v
=
3.00
×
10
8
m
s
/
(
3
m
)
=
1
×
10
8
s
−
1
The frequency of the wave with a speed of 3 m/s and wavelength of 6 m is 0.5 Hz or 1/2 Hz.
What is Frequency?Frequency is the number of occurrences of a repeating event per unit of the time taken. Frequency is also occasionally referred to as temporal frequency, and it is distinct from that of angular frequency. Frequency is measured in SI unit of hertz (Hz) which is equal to one event per second time.
The frequency of a wave can be calculated as:
f = v/ λ
where, f = frequency of the wave,
v = speed or velocity of wave,
λ = wavelength of the wave
Therefore, the frequency of the wave will be:
f = 3/ 6
f = 1/2 or 0.5Hz
The frequency of the wave is 0.5Hz.
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Consider a point on the outer edge of the tire. What is the centripetal acceleration, ac, at this point in m/s2
Answers
The centripetal acceleration is obtained as v^2/r.
What is centripetal acceleration?Circular motion refers to motion along a circular path. There are two forces that act on a body undergoing circular motion;
Centripetal force which keeps it in the pathCentrifugal force which throws it out of the pathThe centripetal acceleration is obtained as v^2/r where v is the linear velocity and r is the radius. The unit is m/s2.
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What is the difference between speed and velocity?
Answers
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Speed is a scalar quantity.Speed ascertain how fast a body moves.[tex] \large \sf \: Speed = \frac{distance}{time} [/tex]____________________________
Velocity is a vector quantity.Velocity Ascertain the object speed & the director on it takes while moving.[tex] \large \sf \: velocity = \frac{displacement}{time} [/tex]Hope Helps~The difference between the two concepts lies in the type of magnitude they represent, speed is a scalar magnitude, while velocity is a vectorial magnitude.
What is speed?It is the variation of distance in a certain time as a consequence of the movement of a mobile element.
What is velocity?It is the vectorial magnitude that shows and expresses the variation in terms of position of an object and as a function of time.
Therefore, we can conclude that speed is a scalar magnitude that determines the ratio of the distance traveled by a body and velocity is a vectorial magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction.
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The origin of our solar system is attributed to the collapse of a single, rotating interstellar cloud of gas and dust known as a(n)
Answers
Answer:
nebula also called solar nebula
Explanation:
Joaquin is at rest at the top of a hill on a skateboard. Four seconds later, he reaches the bottom of the hill at a final velocity of 20 m/s. What was his acceleration?
Answers
Explanation:
Given: Initial Velocity=0
Final Velocity= 20 m/s
Time= 4 s
Accleration: Unknowns
Use kinematic equation
[tex]v _{f} = v _{i} + at[/tex]
[tex]20 = 0 + at[/tex]
[tex] \frac{20m}{s} = a(4s)[/tex]
[tex]a = \frac{5m}{ {s}^{2} } [/tex]
so a = 5 m/s^2
how does a push or pull affect motion?
Answers
Answer:
The motion of an object acted on by a force depends partly on the strength of the push or pull. The stronger the push or pull, the faster the object will move.
Explanation:
2. An overseas jet requires 6 hours to fly 9700 km. What is the jet's speed?
Answers
Answer:
Most commercial aircraft typically fly at around 460-575 mph, or 740-930 km/h, according to Flight Deck Friend. But private jet speed can vary depending on a variety of factors, such as the weight onboard and the weather conditions.
5) What type of substance can seep
groundwater and make it unusable?
Answers
Answer:
I believe chemicals, though I might be wrong.
Explanation:
A small metal ball is given a negative charge, then brought near to end a of the rod (figure 1). What happens to end a of the rod when the ball approaches it closely this first time?.
Answers
What happens to end a of the rod when the ball approaches it closely this first time is; It is strongly attracted.
ElectrostaticsI have attached the image of the rod.
We are told that the ball is much closer to the end of the rod than the length of the rod. Thus, if we point down the rod several times, the distance of approach will experience no electric field and as such the charge on end point A of the rod must be comparable in magnitude to the charge on the ball.
This means that their fields will cancel.
Finally, we can conclude that when a charge is brought close to a conductor, the opposite charges will all navigate to the point that is closest to the charge and as a result, a strong attraction will be created.
This also applies to a strong conducting rod and therefore it is strongly attracted.
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What is the net force needed to accelerate a 21.4 kg grocery sack upward at 1.5 m/s2?
Answers
Answer:
32.1 N Please Give Brainliest
Explanation:
force = mass x acceleration
Which planet in our solar system has the largest ring system?.
Answers
Answer:
Saturn
Explanation:
Saturn has the most spectacular ring system, with seven rings and several gaps and divisions between them.
Use the table of electric force between objects in two different interactions to answer the question
Which conclusion about the interactions is correct?
A. The objects in interaction A are farther apart than in interaction B.
B. The objects in interaction A are smaller than in interaction B.
C. Repulsive forces are stronger than attractive forces
D. Positive charges are stronger than negative charges.
Answers
Answer: we can ues all the time
Explanation: and have fun with it
What happens to gravitational potential energy as a rollercoaster moves down a hill? Question 4 options: It is converted to elastic potential energy It increases It is converted to kinetic energy It remains constant.
Answers
The gravitational potential energy as a rollercoaster converts to kinetic energy when it moves downhill.
What is kinetic energy?
The kinetic energy of an object or body is due to its motion. When the roller coaster moves downhill it accelerates, thus the gravitational potential energy as a rollercoaster converts to kinetic energy.
The gravitational potential energy of an object or body is due to its position above the ground.
Therefore, the gravitational potential energy as a rollercoaster converts to kinetic energy when it moves downhill.
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