Download Chapter 5 Review_2014_key

Chapter 5 Review
Physics 11
1.
What is the distance between a 128 kg object and a 136 kg object if the gravitational force of
attraction between them is 6.582x10-10 N?
2.
The force of gravity between two objects is 1200 N when the objects are 60 m apart. Find the
force of gravity between the objects when they are 480 m apart.
3.
Can a car be moving if all forces acting on it are balanced (ie: if Fnet = 0 N)? Explain.
4.
Two students are on a skateboards and push away from each other. A 48 kg student accelerates
away at 2.6 m/s2. Find the acceleration of the other student if their mass is 32 kg.
5.
A 42.0 N force is applied to a 6.00 kg block but it only accelerates at 5.50 m/s2. Determine both
the force and the coefficient of friction.
6.
A 3.5 kg model rocket accelerates at 9.0 m/s2 into the air for 4.0 s. Find the thrust force provided
by the rocket’s engine.
7.
Want a challenge? Find the maximum height of the rocket in question #6 (remember that it will
continue to rise after the rockets stop firing).
8.
A go-cart, traveling at 65 km/h, skids to a stop. If the coefficient of friction between the tires and
the asphalt is 0.59, how far does the go-cart skid?
9.
What is the size of the normal force from the floor of an elevator on a rider whose weight is
490 if the elevator accelerates up at a rate of 0.650 m/s2?
10.
A 2.5 kg and 3.6 kg mass are hung on either side of pulley and released. Find the acceleration of
the larger mass, and the tension in the string.
11.
Find the impulse acting on a 2.7 g ping pong ball that is moving at 12 m/s before being struck
and given a velocity of 26.5 m/s backwards.
12.
What is the force applied to a 17.0 kg object that changes its velocity from 18.0 m/s to –38.5 m/s
in a time of 14.0 s?
13.
An 800 kg Volkswagen bug traveling at 6.4 m/s [E] bumps into a 5400 kg dump truck that is
traveling at 2.8 m/s [W]. If the speed of the Volkswagen after the collision is 3.5 m/s [W], what
is the final velocity of the dump truck?
14.
What is the final velocity of a 28.0 kg object that has an initial velocity of 12.5 m/s and an
applied force of 98.0 N as it slides for 6.80 s across a rough floor where =0.480 ?
15.
A 490 kg grand piano is suspended on the end of a 2.35 m (rest length) spring. If the spring
constant is 595 N/m, what is the extended length of the spring?
.