True-false questions are worth 2 points each, three-choice multiple
choice questions are worth 3 points each, five-choice multiple choice
questions are worth 6 points each. The maximum possible score is 125.
The exam period was 90 minutes; the mean score was 83.6; the median
score was 85. Click here to see page1
page2 of the formula sheet that came
with the exam.
A physics 101 student weighs 600 N on Earth. She travels in her
spaceship to mysterious planet X which has a radius rX
that is twice the radius of Earth, rX =
2rE. On the surface of planet X, she finds that she
weighs 300 N.
Relative to Earth's mass, mE, what is the mass of
(a) gX > gE
(b) gX = gE
(c) gX < gE
Ralph is using the pulley system shown in the picture to hold a 45 kg
What is the force exerted by the ceiling?
(a) 222 N
(b) 442 N
(c) 662 N
(d) 882 N
(e) 1100 N
(a) fH = T / 3
(b) fH = T
(c) fH = 3 T
A physics book of mass 2 kg is sitting atop a table with coefficient
of static friction μs = 0.4 and coefficient of
kinetic friction μk = 0.3. A person is pushing the
book as shown in the figure.
If the book is at rest, how hard can the person push on the book
before it will start moving?
(a) 2.0 N
(b) 4.1 N
(c) 5.7 N
(d) 6.6 N
(e) 7.8 N
Three boxes of equal mass, m, are connected to one another by
strings as shown in the figure. They are pulled across a frictionless
surface by tension T1.
Which of the three boxes has the largest net force acting on it?
(a) box 1
(b) box 2
(c) box 3
(d) boxes 1 and 3
(e) All three boxes have the same net force acting on them.
(a) a = T1 / m
(b) a = T1 / (2m)
(c) a = T1 / (3m)
(d) a = 2 T1 / m
(e) a = 3 T1 / m
Professor Pitts pushes on a cart of mass 50 kg with a horizontal
force Fpush. There is no friction. The cart has an
acceleration of 5 m/s2.
Which one of the following statements is true?
(a) By Newton's third law, the cart applies an equal and opposite force of
magnitude Fpush on Professor Pitts.
(b) The cart applies an opposite force on Professor Pitts, but it is smaller in
magnitude than Fpush because of the acceleration force.
(c) The force the cart applies on Professor Pitts is responsible for the
acceleration of the cart.
(d) The cart applies no force on Professor Pitts, because it is not pushing back
(e) The cart applies an opposite force on Professor Pitts and it is larger in
magnitude than Fpush.
(a) 1 N
(b) 10 N
(c) 100 N
(d) 250 N
(e) 980 N
A block of mass m1 = 5 kg sits atop a frictionless
incline which makes and angle θ = 25° as shown in the
What is the acceleration of the block?
(a) 1.1 m/s2
(b) 2.1 m/s2
(c) 4.1 m/s2
(d) 9.8 m/s2
(e) 11.1 m/s2
(a) m1 wins.
(b) m2 wins.
(c) It's a tie: the two masses arrive at the same time.
This and the following question concern the same
You are trying to shoot a monkey hanging on a tree branch using a toy
cannon. You aim directly at the monkey and fire the cannon with a speed
v and at an angle of 30° relative to the x direction.
At the same time, the monkey lets go of the tree branch and fall toward
the ground due to gravitational force. We ignore air resistance in this
problem. The distance between the cannon and the tree is 50 m in the
The cannon ball hits the monkey 2 seconds later after the shot was
fired. What was the initial speed of the cannon ball v?
(a) 28.9 m/s
(b) 25.3 m/s
(c) 22.1 m/s
(d) 20.0 m/s
(e) 18.9 m/s
(a) 9.8 m
(b) 19.6 m
(c) 25.4 m
There is a box with a total mass of 1 kg sitting on the floor of an
elevator located in the middle of a vertical shaft. The elevator is
free to move upward or downward. When the elevator is at rest, it takes
a horizontal force of 4 N to make the box start to slide.
The elevator is now moving vertically (without friction). It takes 5 N
of horizontal force to make the box start to slide. What can you say
about the direction of elevator's motion?
(a) It is going up.
(b) It is going down.
(c) Not enough information is given to determine in which direction the elevator is moving.
(a) 5.22 N
(b) 4.6 N
(c) 4 N
(d) 3.4 N
(e) 2.78 N
An airplane is flying due east relative to the
air at a speed of 200 m/s.
The wind is blowing at 30 m/s toward the east relative to the ground.
(With the wind), it takes 1.5 hours to fly from point A to point B,
where point B is due east of point A. Under this condition, how long
will it take to fly from point B to point A?
(a) 1.3 hours
(b) 2.0 hours
(c) 1.7 hours
(d) 1.85 hours
(e) 1.6 hours
(a) 173 m/s
(b) 180 m/s
(c) 202 m/s
(d) 222 m/s
(e) 231 m/s
You are flying on an airplane flying due east at a speed of 50 m/s
and at an altitude of 1,000 m, and drop an apple of 0.1 kg in mass.
Ignore air resistance for this problem. And there is no wind.
What is the speed of the apple when it hits the ground?
(a) 149 m/s
(b) 86 m/s
(c) 140 m/s
(d) 50 m/s
(e) 177 m/s
(a) 2.9 s
(b) 9.8 s
(c) 11.8 s
(d) 14.3 s
(e) 21.7 s
Which is the appropriate relationship between force pulling the cart
(F), the mass of the cart (M), the mass of the weight
(m), and acceleration of the cart (a)?
(a) F = mg = Ma
(b) F= (m+M)g = ma
(c) F= (m+M)g = Ma
(d) F = M= Ma
(e) F= mMg/(m+M) = Ma
The diagram below is a graph of Mary walking on a runway. The detector is
at zero position and velocity. The direction away from the detector is
positive. Note: in reality, a person may not be able to exactly
Where is Mary accelerating?
(a) B, D, F
(b) A, C, E, G
(b) negative infinity
(a) In B she is moving towards the detector while in D she is
moving away from the detector.
(b) There is no difference.
(c) In B she is rapidly speeding up, till the point where she is moving away
from the detector at constant speed, whereas in D she is rapidly
changing direction until she is going at a constant speed walking
towards the detector.