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Bauer and Westfall - University Physics 2/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : – / 12

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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  • Instructions

    Here are some textbook questions from University Physics 2/e by Wolfgang Bauer and Gary Westfall published by McGraw-Hill.

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1. –/1 points BauerPhys2 5.P.021. My Notes
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Two railroad cars, each of mass 8400 kg and traveling at 83 km/h, collide head on and come to rest. How much mechanical energy is lost in this collision?

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2. –/1 points BauerPhys2 5.P.033. My Notes
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A constant force,
F = (4.83, −3.79, 2.28) N,
acts on an object of mass 18.6 kg, causing a displacement of that object by
r = (3.82, 4.04, −2.45) m.
 What is the total work done by this force?

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3. –/1 points BauerPhys2 5.P.037. My Notes
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–/1
 
A bullet moving at a speed of 141 m/s passes through a plank of wood. After passing through the plank, its speed is 131 m/s. Another bullet, of the same mass and size but moving at 90 m/s, passes through an identical plank. What will this second bullet's speed be after passing through the plank? Assume that the resistance offered by the plank is independent of the speed of the bullet.

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4. –/5 points BauerPhys2 5.P.054. My Notes
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A car of mass m accelerates from rest along a level straight track, not at constant acceleration but with constant engine power, P. Assume that air resistance is negligible.
(a) Find the car's velocity as a function of time. (Use any variable or symbol stated above along with the following as necessary: t)
v =


(b) A second car starts from rest alongside the first car on the same track, but maintains a constant acceleration. Which car takes the initial lead?
    

Does the other car overtake it?
    

If yes, write a formula for the distance from the starting point at which this happens. (Use any variable or symbol stated above along with the following as necessary: a for acceleration of the second car, and t. If not, enter NONE.)
x0 =


(c) You are in a drag race, on a straight level track, with an opponent whose car maintains a constant acceleration of 12.9 m/s2. Both cars have identical masses of 1096 kg. The cars start together from rest. Air resistance is assumed to be negligible. Calculate the minimum power your engine needs for you to win the race, assuming the power output is constant and the distance to the finish line is 0.267 mi.

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5. –/2 points BauerPhys2 5.P.067. My Notes
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–/2
 
A flatbed truck is loaded with a stack of sacks of cement whose combined mass is 1211.4 kg. The coefficient of static friction between the bed of the truck and the bottom sack in the stack is 0.372, and the sacks are not tied down but held in place by the force of friction between the bed and the bottom sack. The truck accelerates uniformly from rest to 55.7 mph in 23.6 s. The stack of sacks is 1 m from the end of the truck bed. Does the stack slide on the truck bed?
    

The coefficient of kinetic friction between the bottom sack and the truck bed is 0.257. What is the work done on the stack by the force of friction between the stack and the bed of the truck?

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6. –/2 points BauerPhys2 5.P.069. My Notes
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The 130-kg cart in the figure starts from rest and rolls with negligible friction. It is pulled by three ropes as shown. It moves 107 m horizontally. Find the final velocity of the cart.
magnitude
direction

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