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## Exam 2 Practice Exam and Outline Review

by: Summer Notetaker

10

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# Exam 2 Practice Exam and Outline Review

Marketplace > Saint Mary's College > PHYSICS (PHY) > > Exam 2 Practice Exam and Outline Review
Summer Notetaker

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Typed practice test. handwritten outline of key topics and formulas.
COURSE
General Physics 1
PROF.
Professor Bentley
TYPE
Study Guide
PAGES
11
WORDS
CONCEPTS
Physics
KARMA
50 ?

## Popular in PHYSICS (PHY)

This 11 page Study Guide was uploaded by Summer Notetaker on Tuesday October 11, 2016. The Study Guide belongs to at Saint Mary's College taught by Professor Bentley in Fall 2016. Since its upload, it has received 10 views. For similar materials see General Physics 1 in PHYSICS (PHY) at Saint Mary's College.

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Date Created: 10/11/16
Name: _____________________ Exam 2, Key C. In this exam there are two parts. The first part contains eight multiple-choice questions and the second part consists of two problems to be worked out. Ch. 5-11 Equations ???????? ∑???? = ???????? ⃗ = ???????? |????| ≤ ????????|????????| |????????| = ????????|????????| Gravity: ???? = −???????? ????(????) = ???????????? Springs: ???? = −???????? ????(????) = ???????? 2 2 1 2 1 2 ????????????????????????= 2 m???? + ????2 ???? = ∆???? = −∆???? Energy conservation: ????????= ∑ ???????? ???????? ????????= − ???????? 2 ⃗???????? = ∑ ???? ???? ???? ???? = ∑ ???? ???????? Momentum conservation: ∑ ⃗????= ∑ ????⃗???? where ????⃗ = ????????⃗ ????⃗ = ⃗ × ???? ???? = ⃗ × ⃗ ????????⃗ ∑????⃗ = ????⃗ = ???????? Here is a table of rotational properties and the corresponding linear analogs from Physics for Scientists and Engineers by Tipler and Mosca: Part 1: Multiple Choice Please circle the best answer listed below for each of the multiple-choice questions. 1. If a deuteron, i.e. a ???? nucleus, that was originally at rest breaks apart into a proton and neutron. Which of the results below is physically possible? (Hint: The masses of a neutron and a proton are roughly equal.) 2. A baseball player slides into third base. Why, according to the Newtonian model of motion, does the player eventually come to rest? a. All moving objects naturally come to rest. b. Friction overpowers the force of the player’s motion. c. The force of the player’s motion eventually wears out. d. A friction interaction changes the player’s motion. e. Both b. and c. 3. Here is a plot of potential energy for a given system as a function of position. What is the approximate value of the force at the position x=0.15 m? a. ???? = −780 ???? ???? b. ???? ???? −525 ???? c. ???? ???? −480 ???? d. ???? ???? 0 ???? e. ???? ???? 525 ???? 4. The figure to the right shows an external force applied at the given position on a cylindrical disk. What direction is the resulting torque? a. –z direction (into the page) b. +z direction (out of the page) c. –x direction (left) d. +y direction (up) e. There is no resulting torque. 5. A mass is placed at the top of an inclined plane that is held an angle of 30°. What is the work done by gravity when a 5 kg mass slides 1 m down the surface of the incline? a. 24.5 J b. 36.8 J c. 42.5 J d. 49.1 J e. 98.1 J 6. An object has a moment of inertia of ???? = 8 ???????? ???? . It initially rotates with an angular speed of 2 rad/s. What is the angular speed after 4 Nm of torque is applied by a breaking force for 2 seconds? a. 0.06 rad/s b. 0.13 rad/s c. 0.50 rad/s d. 0.89 rad/s e. 1.00 rad/s Part 2: Worked Out Problems Please show all steps and include units at all points of the following calculations. 1. An 8 kg mass is placed toward the top of an inclined plane, which has a variable angle of inclination (????) relative to the horizontal. The coefficient of static friction is 0.28 between the mass and incline, and the coefficient of kinetic friction is 0.2. a) Draw a free body diagram for the mass if it moves at a constant speed down the incline. b) Determine the angle at which the block will move at a constant, nonzero speed. 2. A 5 kg bowling ball traveling in the x-direction at 3 m/s collides with a 1 kg bowling pin that is initally at rest. After the collision the pin moves with a speed of 3 m/s at an angle of 60° above the x-axis. a) What are the x and y components of the final momentum of the ball? b) What is the final momentum of the ball (magnitude and direction)? 3. A 55 kg skier starts from rest at height H = 18 m above the end of a ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of θ = 31° with the horizontal. Neglect the effects of air resistance and assume the ramp is frictionless. a) What is the maximum height h of his jump above the end of the ramp? b) If he increased his weight by putting on a 10 kg backpack, what would h be?

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