Which of the following statements describe the speed of sound? Select all that apply.
2 answers:
Answer:
The speed of sound is faster in aluminum than in water.
Sound moves faster in most solids than in gasses.
The speed of sound is slightly faster in the summer than in the winter.
Explanation:
As we know that the speed of sound is given by the formula
(in solids)
(in gases)
So here from above formulas we can say that elasticity of solids is more than the elasticity of liquids or gases
so here we have
1). The speed of sound is faster in aluminum than in water.
3). Sound moves faster in most solids than in gasses.
Also as we can see that the speed of sound is directly depends on the temperature of the medium or gas
so here as we increase the temperature the speed of the sound in that medium will increase
so here we have
5). The speed of sound is slightly faster in the summer than in the winter.
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You will have to use this formula:
Final Velocity (V) = 4m/s
Initial Velocity (Vo) = 8m/s
Acceleration (a) = ? m/s^2
Time (t) = 2 secs
Then:
-> 4 = 8 + a x 2
-> 4 - 8 = 2a
-> -4 = 2a
-> a = -4/2
-> a = -2 m/s^2
Ps: It's value is negative because the she was in retrograde motion.
Answer: Her acceleration is -2 m/s^2.
Final Velocity (V) = 4m/s
Initial Velocity (Vo) = 8m/s
Acceleration (a) = ? m/s^2
Time (t) = 2 secs
Then:
-> 4 = 8 + a x 2
-> 4 - 8 = 2a
-> -4 = 2a
-> a = -4/2
-> a = -2 m/s^2
Ps: It's value is negative because the she was in retrograde motion.
Answer: Her acceleration is -2 m/s^2.
First of all we need to convert everything into SI units.
Let's start with the initial angular speed,
. Keeping in mind that
we have
And we should also convert the angle covered by the centrifuge:
This is the angle covered by the centrifuge before it stops, so its final angular speed is
.
To solve the problem we can use the equivalent of
of an uniformly accelerated motion but for a rotational motion. It will be
And by substituting the numbers, we can find the value of
, the angular acceleration:
Let's start with the initial angular speed,
we have
And we should also convert the angle covered by the centrifuge:
This is the angle covered by the centrifuge before it stops, so its final angular speed is
To solve the problem we can use the equivalent of
of an uniformly accelerated motion but for a rotational motion. It will be
And by substituting the numbers, we can find the value of