A7
Q uestion 1
In problem 14, in the workbook, let the radius of the circle be 25 cm, and the plane of the circle be 2 m above
the ground. What is the magnitude of the centripetal acceleration of the ball during its circular motion?
a. 0.64 m/s2
b. 3.13 m
A12
Q uestion 1
Assume the force in problem 25 in the workbook acts on an object that moves in the x-direction
from x = 0 to x = 4 m. What is the work done by the force?
a. 56 J
b. 35 J
c. 32 J
d. 24 J
e. 20 J
Q uestion 2
In problem 26 in the workbook, ch
A8
Q uestion 1
Is it possible to have motion in the absence of a force?
a. No.
b. Only in a non-inertial frame.
c. Only in outer space.
d. Only in a moving frame.
e. None of the above.
Q uestion 2
A train is moving with constant velocity v along a straigh
A1
Q uestion 1
Which of the following statements about vectors and scalars are TRUE?
a. A vector is a large quantity and a scalar is a small quantity.
b. A scalar quantity has a magnitude and a vector quantity does not.
c. The quantity 20 m/s, north is a
A6
In problem 12, in the workbook, assume the ball strikes the ground 100 m from the base of the building. Find
the flight time of the ball (in seconds).
(Type a number with three significant figures into the box.)
Q uestion 2
In problem 12, in the workbo
A5
Q uestion 1
The vector position of a particle varies with time according to the expression r=(3i-6t2j). What
are the velocity components (in m/s) vx(t) and vy(t)?
a. vx(t)= 3 vy(t)=6
b. vx(t)= 3 vy(t)=-6t2
c. vx(t)= 3 vy(t)=6t
d. vx(t)= 0 vy(t)=-6t
Q u
A2
Q uestion 1
Which of the following statements about velocity and/or speed are TRUE?
(1) Velocity is a vector quantity and speed is a scalar quantity.
(2) The average velocity of an object on a round-trip journey would be 0.
(3) Person X moves from loca
A4
Q uestion 1
An object is thrown straight up. At the top of its path
a. the velocity is zero and the acceleration is zero.
b. the velocity is zero and the acceleration is equal to the weight.
c. the velocity is zero and the acceleration is equal to g po
A9
Q uestion 1
In problem 17, in the workbook, let the people pull at an angle of 15o. What is the resistive force
F exerted on the boat by the water?
a. 0
b. 1200 N towards the right
c. 1200 N towards the left
d. 1159 N towards the left
e. 600 N directed
A14
Q uestion 1
If the radius of the circle in problem 23 in the workbook is 17.5 m, what is the speed of the vehicle?
a. 13.3 m/s
b. 13.2 m/s
c. 13.1 m/s
d. 13 m/s
e. 12.8 m/s
Q uestion 2
Choose all the statements which are true. You can choose more than
A3
Q uestion 1
An object's motion is restricted to one dimension along the positive x-axis. It stays to the right of the
origin. Answer each of the questions below by selecting the velocity versus time graph that is the best
choice to describe the answer.
A13
Q uestion 1
A child is riding a bike and skids to a stop. What happens to their kinetic energy?
a. It is turned into gravitational potential energy.
b. It is turned into elastic potential energy.
c. It is conserved.
d. It is converted into thermal ene
A10
Q uestion 1
A skier skis in a straight line down a hill gradually picking up speed as he goes. Which of the following
could plausibly be an external force diagram for the skier during this motion? Assume air resistance is
negligible.
Q uestion 2
A car
A11
Q uestion 1
A small metal cylinder rests on a circular turntable, rotating at a constant speed, as illustrated in the
diagram above. Which of the sets of vectors best describes the velocity, acceleration, and net force acting
on the cylinder at the po