Homework 5
Chapter 8
Review Questions: 2, 6, 15, 23, 27, 30, 32
Plug and Chug: All of them
Ranking: 4
Exercises: 12, 20, 30, 42, 46, 48, 50, 60
Problems: 2, 4
Chapter 10
Review Questions: 1, 3, 5, 9, 13, 16, 18, 20, 22
Ranking: 2, 4
Exercises: 2, 8, 12, 16, 20, 28, 30, 42, 58, 60
Problems: 2, 4, 6, 8
Problem II: Perform the Tension-Torque problem on slide 34 of Lecture Series 1, with a 100kg box sitting
2 meters from the right end of a 6 meter long 20kg platform.
Problem III: Harry wants to be a punter on the football team, so he uses a very precise stop watch to
calculate his hang time. His trial goes awry however, when after punting the ball in an alley, it lands on
the roof of an adjacent building. Predicting this outcome, he has the where withal to stop the stop
watch at the moment that the ball reaches its maximum height. The stopwatch says 2.0 seconds. He
then measures the height of the roof where the ball lands and finds it to be 15.0 meters high. He finds
the horizontal displacement at this point to also be and 15.0 meters (in the x-direction), from where it is
punted. Assume that the ball is kicked from ground level and calculate the following: (Remember, use a
convention and stick by it, i.e. if down vectors are negative up vectors are positive.) (assume g =
10.0m/s
2
)
a)
What is the initial vertical velocity (
𝑣
o
?
) of the football when it leaves Harry’s f
oot?