1. If you double the stretched length of a spring, the potential energy stored i
ID: 1293779 • Letter: 1
Question
1. If you double the stretched length of a spring, the potential energy stored in the spring goes up by a factor of _______.
2
4
16
1/4
none of the above
2. The distance between the crest of a water wave and the next trough is 2m. If the frequency of a particular wave is 2 Hz, what is the speed of the wave?
4 m/s.
1 m/s
8 m/s.
2 m/s.
need more information.
3. A block-spring system vibrating on a frictionless, horizontal surface with an amplitude of 6.0cm has a total energy of 12J. If the block is replaced by one having twice the mass of the original block and the amplitude of the motion is again 6.0cm, what is the energy of the more massive system?
12J.
24J.
6J.
48J.
None of the above.
4. A simple pendulum has a period of 2.5s. What is its period if its length is made four times as large?
0.625s
1.25s
2.5s
3.54s
5.0s
5. If you cut a long spring so that it is half as long, what happens to its spring constant? (Assume that Hooke's Law remains valid).
It becomes 1/4 as large.
It becomes 1/2 as large.
It becomes twice as large.
It becomes four times larger.
It stays the same.
6. What happens to the speed of a wave on a string when the frequency is doubled? Assume the tension in the string remains the same.
It becomes 1/4 as large.
It becomes 1/2 as large.
It becomes twice as large.
It becomes four times larger.
It stays the same.
7. Which of the following is true?
Hooke's Law is always valid.
Hooke's Law is never valid.
Hooke's Law is an approximation that is not always valid.
Hooke's Law violates conservation of energy.
None of the above.
8. A mass of 0.5 kg is hung from a spring with k = 20 N/m. How much does the spring stretch in order to establish equilibrium? (assume g = 10 m/s2)
2m
4m
1/2 m
1/4 m
1 m
9. What length should a pendulum be in order to have a period of 1.00s?
x
24.8cm
24.8m
4.03m
0.04cm
None of the above
10. Which of the following is true about waves?
Longitudinal waves oscillate in the direction of propagation.
Transverse waves oscillate perpendicular to the direction of propagation.
Light waves in vacuum travel about 1 million times faster than sound waves in air.
Traveling waves can meet and pass through each other without being destroyed or altered.
All of the above
2
4
16
1/4
none of the above
Explanation / Answer
only answers
1.4
2. 16 m/s
3. im not sure about this 24 J
4.1.25 s
5.it stays the same
6.becomes twice as large
7. none of the above hookes law valid up to elastic limit consevation of energy happens and after the limit energy does not conserve
8. 1/4 m
9. none of the above
10.all the above
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