Question 1

A simple pendulum,2.0 m in length,is released from rest when the support string is at an angle of 25° from the vertical.What is the speed of the suspended mass at the bottom of the swing?

Accepted Answer

The answer of A simple pendulum,2.0 m in length,is released...

Question 2

A 70-kg high jumper leaves the ground with a vertical velocity of 6.0 m/s.How high can he jump?

Accepted Answer

The answer of A 70-kg high jumper leaves the ground...

Question 3

While running,a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass.If a 60-kg person runs with a power of 70 Watts during a race,how fast is the person running? Assume a running step is 1.5 m long.

Accepted Answer

The answer of While running,a person dissipates about 0.6 J...

Question 4

When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road.If the power developed in an engine is 50.0 hp,what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.

Accepted Answer

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Quiz 8: Conservation of Energy

A simple pendulum,2.0 m in length,is released from rest when the support string is at an angle of 25° from the vertical.What is the speed of the suspended mass at the bottom of the swing?

A 70-kg high jumper leaves the ground with a vertical velocity of 6.0 m/s.How high can he jump?

While running,a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass.If a 60-kg person runs with a power of 70 Watts during a race,how fast is the person running? Assume a running step is 1.5 m long.

When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road.If the power developed in an engine is 50.0 hp,what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.