Physics homework 3 questions ASAP
I need these question explained in detail and work shown due Sunday 27th
2. A bullet with a mass of 0.01 kg is fired horizontally into a block of
wood hanging on a string. The bullet sticks in the wood and causes
it to swing upward to a height of 0.1 m. If the mass of the wood
block is 2 kg, what was the initial speed of the bullet?
4. A person on a swing moves so that the chain is horizontal at the
turning points ( ● Figure 3.48). Show that the centripetal accelera-
tion of the person at the low point of the arc is exactly 2 g, regard-
less of the length of the chain. This means that the force on the
chains at the low point is equal to three times the person’s weight.
(Hint: The vertical distance between the turning point and the low
point equals the length of the chain.)
6. The “shot” used in the shot-put event is a metal ball with a mass of
7.3 kg. When thrown in Olympic competition, it is accelerated to a
speed of about 14 m/s. As an approximation, let’s say that the athlete
exerts a constant force on the shot while throwing it and that it
moves a distance of 3 m while accelerating.
(a) What is the shot’s kinetic energy?
(b) Compute the force that acts on the shot.
(c) It takes about 0.5 s to accelerate the shot. Compute the power
required. Convert your answer to horsepower.
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