f a glass of water is on a table with a piece of paper under it, it is relativel
ID: 1327470 • Letter: F
Question
f a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because, with a quick pull:
a)p on the glass will be less since t is less.
b)the force on the glass will be less.
c)the momentum of the paper will be greater.
d)the coefficient of kinetic friction will be less.
2. A diver begins a high dive with an angular velocity of 6.3 rad/s. By tucking himself into a ball, he decreases his moment of inertia by a factor of 9.0. What is his new angular speed?
a)84 rad/s
b)0.70rad/s
c)57rad/s
d)19 rad/s
Explanation / Answer
1.
Momentum of glass will not change much, so glass will not move
a)p on the glass will be less since t is less.
2.
By conservation of angular momentum :
Ii*wi = If*wf
wf = wi*(Ii/If)
= 6.3*(9)
= 56.7 rad /s
Answer: c
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.