1. Ml3 5.3.x·004 My Notes -4 points Answer these questions about the rate of cha

Question

1. Ml3 5.3.x·004 My Notes -4 points Answer these questions about the rate of change of momentum (dp/dt): (a) A block oscillating up and down on a spring comes to the top of its path, where it is momentarily at rest. At the instant it is at rest, is the rate of change of its momentum (dp/dt) + zero, up, or down? zero (b) You throw a ball straight up into the air. At the instant the ball reaches its highest location, is the rate of change of its momentum (dp/dt) zero, up, or down? up (c) A basketball travels straight down, hits the floor, and bounces back straight up. At the moment when it is in contact with the floor and its speed is zero, is the rate of change of its momentum (dp/dt) zero, up, or down? zero (d) A tennis ball traveling horizontly to he right hits a wall and bounces straight back with nearly the same speed. While the ball is in contact with the wall, is the rate of change of its entum ídn/dt) zero, to the left, or to the right? Select-- to the left to the right 2. ÷ 1 points My Notes Which of the following are you not asked to compute in your challenge for Activity-05.II? o the linear frequency of the ball o the mass of the ball o the centripetal force acting on the ball the tension in the string o the period of the ball 3. -2 points MI3 5.4.X.021 My Notes If the radius of a merry-go-round is 5 meters, and it takes 9 seconds to go around once, what is the speed of an atom at the outer rim? m/s What is the direction of the velocity of this atom? O towards the center o away from the center O tangential

Explanation / Answer

3: speed is given by |w×r|, vector product'magnitude

i.e |v|= 5×(2/9) = 10/9= 3.49m/sec.

Velocity is always tangential around the circle

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