## Fundamentals of Physics Study Set 2

Physics & Astronomy

## Quiz 7 :

Kinetic Energy and Work

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Q12 Q12 Q12

A sledge (including load)weighs 5000 N.It is pulled on level snow by a dog team exerting a horizontal force on it.The coefficient of kinetic friction between sledge and snow is 0.05.How much work is done by the dog team pulling the sledge 1000 m at constant speed?

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Q14 Q14 Q14

Camping equipment weighing 6000 N is pulled across a frozen lake by means of a horizontal rope.The coefficient of kinetic friction is 0.05.How much work is done by the campers in pulling the equipment 1000 m if its speed is increasing at the constant rate of 0.20 m/s

^{2}?Free

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Q35 Q35 Q35

A 0.50-kg object moves on a horizontal frictionless circular track with a radius of 2.5 m.An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around.If it starts from rest, then at the end of one revolution the radial component of the force of the track on it is:

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Q40 Q40 Q40

A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30 with the horizontal.His force is parallel to the slope.If the speed of the crate decreases at a rate of 1.5 m/s

^{2}, then the work done by the man is:Free

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Q47 Q47 Q47

An ideal spring, with a pointer attached to its end, hangs next to a scale.With a 100-N weight attached, the pointer indicates "40" on the scale as shown.Using a 200-N weight instead results in "60" on the scale.Using an unknown weight X instead results in "30" on the scale.The weight of X is:

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Q50 Q50 Q50

An ideal spring is hung vertically from the ceiling.When a 2.0-kg mass hangs at rest from it, the spring is extended 6.0 cm from its relaxed length.A downward external force is now applied to the mass to extend the spring an additional 10 cm.While the spring is being extended by the force, the work done by the spring is:

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Q52 Q52 Q52

An ideal spring is hung vertically from the ceiling.When a 2.0-kg mass hangs at rest from it, the spring is extended 6.0 cm from its relaxed length.An upward external force is then applied to the block to move it upward a distance of 16 cm.While the block is being raised by the force, the work done by the spring is

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