Motion in Two Dimensions
Practice Test
1.
In Figure 6-1, if the baseballs fell a vertical distance of 1.6 m from the first to the last image, what is the time interval between frames?
a.
0.095 s
b.
0.081 s
c.
0.071 s
d.
0.23 s
Hint
2.
Which of the following situations is physically the most like that depicted in Figure 6-9a?
a.
You step upwards on an upward-moving escalator.
b.
You walk toward the rear of a forward-moving train.
c.
You jump up in an elevator that is going down.
d.
You slide to the right on the seat of a forward-moving bus.
Hint
3.
Any moving object that moves through the air only under the force of gravity (after initial thrust) is a(n) __________.
a.
vector
b.
projectile
c.
satellite
d.
free floater
Hint
4.
You are riding in a boat that is traveling 15.0 m/s in still water. You move from the bow to the stern at 3.0 m/s. What is your speed relative to the water?
a.
12.0 m/s relative to the water
b.
18.0 m/s relative to the water
c.
15.3 m/s relative to the water
d.
9.0 m/s relative to the water
Hint
5.
In Figure 6-7, if the mass of the hammer is 7.26 kg, its center is 0.50 m from the thrower, and it is moving at a speed of 1.5 m/s, what is the tension in the chain?
a.
3.0 N
b.
33 N
c.
4.5 N
d.
22 N
Hint
6.
A carnival ride has a 3.0-m radius and rotates once every 1.7 s. What is the speed of the rider?
a.
3.4 m/s
b.
11 m/s
c.
5 m/s
d.
9.4 m/s
Hint
