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  3. a) a student stretches an elastic band by 0.8 m in

A) A student stretches an elastic band by 0.8 m in 0.5 seconds. The spring constant of...

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Physics

A)

A student stretches an elastic band by 0.8 m in 0.5 seconds. Thespring constant of the elastic band is 40 N/m. What was the powerexerted by the student?

25.6 W
64.0 W
12.8 W
32 W

B)

A student pushes a 0.2 kg box against a spring causing thespring to compress 0.15 m. When the spring is released, it willlaunch the box vertically into the air. What is the maximum heightthe box will reach if the spring constant is 300 N/m?

0.3 m
5.8 m
1.7 m
3.4 m

C)

A student connects a 1 hp motor to a bicycle. How much time willit take for the bicycle to accelerate from rest to a speed of 5.0m/s if the combined mass of the student and the bicycle is 120 kg?(1 hp = 746 W)

0.5 s
1500 s
2.0 s
300 s

Answer & Explanation Solved by verified expert
4.3 Ratings (963 Votes)
AGivenThe energy of the spring when it is compressed by an amount d isgiven bythe    See Answer
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