University Physics 1
Final Exam
Name: _____________________________ Instructions:
• This exam must be turned in by Wednesday, May 12 (11:59pm). Please submit a pdf document to the course Blackboard page.
• Please print out the exam and hand-write your solutions, then scan it and submit. • Correct units must be included with every answer.
• Answers should be written on the blank provided, and work that you want credit for must be in the box following the answer. If you need more space you may attach page, but indicate in the box that the work is continued on another page.
• You may use your notes and text book. You may not receive assistance from any other person or from material found online (except for the resources on our course web site).
• If you have a question about a clarification, you may ask the instructor by email. ◦ Do not ask for hints or how to do a problem.
◦ You should only expect an answer within 24 hours of asking.
◦ If you cannot get an answer to a question you have, make a reasonable assumption, state it and proceed. In the case of multiple choice, the instructions indicate that you select "the best answer", which you should do even if there is some ambiguity.
• In the unlikely event that any change is made or hint given, it will be immediately announced on the course home page.
• Read and initial the lines below. This is required for the exam to be accepted.
Read and initial next to each statement. Your initial located next to each item below signifies your understanding and compliance with the instructions for this take-home examination.
______ I understand that I may not copy or distribute this exam to anyone.
______ I understand that I must return a PDF copy of the solved exam to my instructor, via Blackboard assignment submission by the stated deadline whether or not I complete the exam.
______ I understand this is a test and I cannot plagiarize my answers and I must show all of my work. I cannot copy answers from other students. I cannot use the internet for assistance. I understand that I may not discuss this exam with other students (current or previous). Furthermore, I cannot seek assistance, of any kind, from ANYONE.
______ I understand that violation of this agreement will result in an F on this exam and it cannot be replaced. It will be averaged in (as a 0%) with my other scores in the course.
______ I understand that after I submit my test on Blackboard, I will not be allowed to modify any part of the exam for any reason.
Multiple Choice Questions:
Select the best answer by circling the letter.
1. A hand pushes a small block which pushes a large block. Both blocks are speeding up as they move to the right, and both experience friction. During this motion...
a. the amount of force with which the small block pushes on the big block is equal to that with which the large block pushes on the small block.
b. the amount of force with which the small block pushes on the big block is smaller than that with which the large block pushes on the small block.
c. the amount of force with which the small block pushes on the big block is greater than that with which the large block pushes on the small block.
d. the blocks do not exert forces on each other.
2. Blocks A and B are connected by a string passing over a pulley. Block B is falling and dragging block A across a frictionless table. Which diagram shows the forces on block A?
a. b. c. d.
3. A car is initially moving at 10 m/s west and a little while later it is moving at 10 m/s south. Which of the following best describes the direction of the average acceleration during this time interval? a. south-east b. south-west
c. north-east d. north-west
4.
a. b.
5. A wrench floats weightlessly in space. It is subjected to two forces of equal and opposite magnitude:
How will the wrench move? a. it will translate and rotate b. it will translate but not rotate c. it will rotate but not translate d. it will neither translate nor rotate
6. An elevator is moving up while slowing to rest at the top floor. As it slows, what are the correct signs of the work done by gravity (Wgrav) and the work done by tension in the supporting cable (Wtens)?
a. Wgrav is positive and Wtens is positive b. Wgrav is negative and Wtens is positive c. Wgrav is positive and Wtens is negative d. Wgrav is negative and Wtens is negative
7. Mass m1 and mass m2 are moving with the same momentum, but m1 > m2. How do their kinetic energies (K1 and K2) compare?
a. K1 = K2 b. K1 > K2
c. K1 < K2 d. K1 could be greater or less than K2
8. A particle of mass M moves in a circle of radius R with angular velocity ω. A sphere of mass M and radius R spins with angular velocity ω . Their kinetic energies are Kp and Ks , respectively.
Which is true?
9. What does the scale read? a. 500 N b. 1000 N c. 2000 N d. 4000 N
10. Forces and are applied to the corners of a square plate. What single force (direction and point of application) could be applied for the plate to be in static equilibrium?
a. applied at the upper left corner
b. applied at the upper right corner c. applied at the center of the square
d. applied at the upper left corner
11. Two satellites are in circular orbit of the Earth. Which has a greater orbital speed?
a. b.
c. d. it is impossible to tell
12. A planet has twice the mass and twice the radius of the Earth. What is the free-fall acceleration on the surface of that planet (in terms of Earth’s value of g)?
a. g b. 2g
c. g/2 d. g/4
A
Long Answer Problems:
Correct units must be included with every answer.
Answers should be written on the blank provided, and work that you want credit for must be done in the box. If you need more space, indicate in writing that the work is continued on another page. 1. The driver of a car moving at 90.0 km/h presses down on the brake as the car enters a circular
curve of radius 150.0 m. If the speed of the car is decreasing at a rate of 9.0 km/h each second, what is the magnitude of the acceleration of the car at the instant its speed is 60.0 km/h? (Assume the car is in the circular curve for the entire motion.)
2. Two masses are connected on a ramp as shown on a ramp. If
mass kg, kg and , find the
acceleration of block A up the ramp.
Your solution must include a free-body diagram for each box.
answer: _______________________________________________
30° 50°
B
A
3. A rock (mass 500 g) slides without friction on ice with initial velocity m/s. It is then subjected to a constant force of for 2.0 s. What is the rock’s velocity (vector) after the 2.0-s interval?
4. A large globe (radius 80.0 cm) is spinning with an angular speed 50 rev/min and slows down and stops in 1.0 min.
a. What is the globe’s angular acceleration assuming it is constant? b. How many revolutions does the globe make while stopping?
answers:
a. ____________________________________________ b. ____________________________________________
5. A uniform 50.0-kg plank of length 8.0 m is supported by two light cables, as shown. A 70.0-kg painter stands 1.0 m from the left end of the scaffold, and his bucket is 2.0 m from the right end. If the tension in the left cable is twice that in the right cable, find the tensions in the cables and the mass of the bucket.
answers:
Tension in left cable = ____________________________________________ Tension in right cable = ____________________________________________ mass of bucket = ____________________________________________
6. An asteroid has speed 12.0 km/s when it is located 2.00 AU from the sun. At its closest approach, it is 0.500 AU from the Sun. What is its speed at that point? (Note: 1 AU = 1.50×1011 m.)
