1) A basketball is thrown
into the basket. The ball leaves the player's hand at t = 0 and reaches the basket at
t = 3s. Which best represents the ball's kinetic energy as a function of time?
2) Work is measured in
what unit?
a) Newtons
b) Joules
c) meters/second
d) Watts
3) What is
the minimum power developed by a 75 kg person who climbs a set of stairs 4.5 m high in 5.0
s?
4) A 3.5 kg
projectile was launched vertically at 75 m/s. The projectile reached a maximum height
of 180 m. How much energy was lost to heart while the projectile was rising?
5) A 50 kg
crate is pulled 40m along a horizontal floor by a constant force exerted by a person, Fp
= 100 N, which acts at a 37o angle above the horizontal. The floor exerts a
friction force Ff = 50 N. Determine:
- the work done by each force acting on the crate.
- the net work done on the crate.
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6) A 5.20
kg block sliding at 9.40 m/s across a horizontal frictionless surface collides head on with
a stationary 8.60 kg block. The 5.20 kg block rebounds at 1.80 m/s. How much
kinetic energy is lost during the collision?
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