Question

1. The Empire State Building in New York City is 381 meters tall. If a penny were dropped from rest at that height, how many seconds would it take to strike the street below? Air resistance would make a significant difference in the real world case, but ignore air resistance for now.
2. As a 5 kg ball rolls down a ramp, the net force on it is 15 N. What is its acceleration?
3. A long-distance runner has an average speed of 0 m/s during a race. How far, in meters, does the runner travel in 10 minutes?
4. If I take a spring with some spring constant k out of a box and hook it to a mass M, I can measure its frequency to be some value f. If I then remove the first mass and put a new mass of size 2M on the same spring, which statement below would be true?

    The frequency would be larger.

    The frequency would smaller.

    The frequency would remain the same.

    Not enough information to answer

5. A child attaches a rubber ball on a string and whirls it around in a circle overhead. If the string is .75 m long and the ball's speed is 8.0 m/s, what is the ball's centripetal acceleration, in units of m/s^2?
6.   When a roulette wheel is set spinning and then released, it eventually slows down to a stop. Explain, with specific concepts from the class, why the wheel doesn't simply keep spinning forever.

Answer 1

0 ta 2H color 2x 381 8. 82 sec J Z 19 9.80 2 a = Gl = 3 m/g2 o vta oxlo -10 om 3 4 = fram L afa fram frequency would be smaller, (8) 185.33/ red mig? 32 dep 8-75 6 Because friction stops the wheel.