Answer:
78m
Explanation:
The Doppler effect A. is the basic explanation for the green shift of light in our Universe. B. occurs when the frequency of sound waves received is lower if the wave source is moving toward you than if it's moving away. C. can be applied to sound waves. D. occurs when the pitch of a sound gets lower if the source is approaching.
Answer:
B
Explanation:
hope that helps!
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.
Answer: we can ues all the time
Explanation: and have fun with it
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)
Answer:
nebula also called solar nebula
Explanation:
A student drops a bag of mass m onto a cart of mass M that is sliding with speed vo along a horizontal track with negligible friction. Immediately after the bag lands in the cart, the cart-bag system moves with speed uf. Which of the following statements correctly relates the two speeds and gives a correct reason for this relationship?
A. vf
B. Uf 00, because the kinetic energy of the bag decreases.
C. Uf > Vo, because the linear momentum of the bag is added to the linear momentum of the cart.
D. Uf = vo, because the bag is moving perpendicular to the cart.
When the bag lands on the cart, it follows that vf < vo given the fact that some mechanical energy is now lost by the system.
What is friction?The term friction refers to the force that opposes motion. The direction of the frictional force is opposite to the force that causes motion.
When the bag lands on the cart, it follows that vf < vo given the fact that some mechanical energy is now lost by the system. Note that the potential energy of the bag is converted to kinetic energy.
Learn more about kinetic energy: https://brainly.com/question/999862?
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 !!!
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 sound signal traveling underwater has a frequency of 230 hertz. The speed of sound under water is 1. 45 × 103 meters/second. What is the wavelength of the sound signal? A. 6. 3 meters B. 2. 3 meters C. 3. 0 meters D. 1. 2 meters E. 9. 3 meters.
Answer:
A.6.3
Explanation:
Please help me!!!!!!!!
Please help! thank you!
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 can be done to improve the efficiency of a ramp?
A.) Make it shorter and steeper.
B.) Add a rough surface.
C.) Insulate the surface with foam.
D.) Smooth the surface
The efficiency of the ramp can be improved by smoothening the surface. The correct option is D.) Smooth the surface
Efficiency
Efficiency is the percent of work put into a machine by the user that becomes work done by the machine.
It could also be defined as the percentage ratio of the output energy to the input energy.
The closer to 100 percent a machine’s efficiency is, the better it is at reducing friction.
Therefore, a surface that would provide a lower friction would increase the efficiency of the ramp.
A smooth surface reduces friction.
Hence, the efficiency of the ramp can be improved by smoothening the surface. The correct option is D.) Smooth the surface
Learn more on Efficiency here: https://brainly.com/question/25143359
What is the difference between light and electromagnetic wave?.
Explanation:
Explanation:Light is a form of electromagnetic radiation. Other forms of electromagnetic radiation include radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays, and gamma rays. ... The only difference between them is their wavelength, which is directly related to the amount of energy the waves carry.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?
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 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?.
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.
Read more about Electrostatics at; https://brainly.com/question/18108470
Which planet in our solar system has the largest ring system?.
Answer:
Saturn
Explanation:
Saturn has the most spectacular ring system, with seven rings and several gaps and divisions between them.
What happens to velocity when elasticity decreases.
Answer: An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. ... They collide, bouncing off each other with no loss in speed.
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?
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
What is the power output of a pump which can raise 60kg of water height to height of 10m every minute
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.
On a cosmic calendar, in which the history of the universe is compressed into one year, how long is the average human life span?.
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
An emergency vehicle blowing its siren is moving
away from you with a speed of 23 m/s. The sound you
hear has a frequency of 590 Hz. What is the frequency
produced by the siren?
The frequency produced by the siren is 631.12 Hz
Doppler effectThe variation in frequency when a source of sound moves relative to an observer is determined by the doppler effect.
Frequency of observerSo, the frequency of the observer f' = (v ± v')f/(v ± v") where
f' = 590 Hz
f = frequency of source or siren ,
v = speed of sound = 330 m/s,
v' = speed of observer = 0 m/s (since you are stationary) and
v" = speed of source = 23 m/s
Since the source moves away from the detector, the sign in the denominator is positive and v' = 0 m/s
So, f' = (v + 0)f/(v + v")
f' = vf/(v + v")
Since, we require the frequency of the source, make f subject of the formula, we have
Frequency of sirenf = (v + v")f'/v
Substituting the values of the variables into the equation, we have
f = (v + v")f'/v
f' = (330 m/s + 23 m/s) × 590 Hz/330 m/s
f' = 353 m/s × 590 Hz/330 m/s
f' = 208270 m/sHz/330 m/s
f' = 631.12 Hz
The frequency produced by the siren is 631.12 Hz
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A neutral metal sphere is attracted to a positively-charged amber rod. Why does this occur?.
Hi there!
A neutral metal sphere is comprised of both ELECTRONS and PROTONS.
Recall that electrons have a NEGATIVE (-) charge, and protons have a POSITIVE (+) charge.
Opposite charges attract, and like charges repel.
In this instance, the positively-charged rod will cause the electrons in the neutral metal sphere to move towards the side facing the rod (opposite charges attract), which causes the two to be attracted to one another.
Who was th efirst person to come up with the idea of the atoms.
Answer:
Democritus
Explanation:
Democritus was a Greek philosopher who was the first person to use the term atom . However ,John Dalton was the first to adapt Democritus’ theory into the first modern atomic
model
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?
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
Evidence that the universe is expanding is best provided by the.
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.
Answer:
9.8 meters per second squared
Explanation:
Answer:
9.8 meters per second squared
Explanation:
edge
water has a specitic hect capacity of 4200J/kg°.How much heat energy must be supplied to raise the temperature of 1.5 kg of water by
10°c
Answer:
Q=MCT Q= 1.5 kg*4200*10. Q=63000 joule
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
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:
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?
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
What is the frequency of a wave with speed 3m/s and wavelength 6m?
(please with an explanation i'm stoopid) <3
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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How would decreasing the time it takes you to run a certain distance affect your speed? Explain your reasoning.
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.
What is the net force needed to accelerate a 21.4 kg grocery sack upward at 1.5 m/s2?
Answer:
32.1 N Please Give Brainliest
Explanation:
force = mass x acceleration
Explain how the force of electric interactions is related to the force of magnetic interactions.
Explanation:
An electric force is a force of attraction or repulsion between charged particles, which have unequal numbers of protons and electrons.
Similar to electric charges, opposite poles attract, and like poles repel. The stronger the magnets and the closer together they are, the stronger the magnetic force between them.
