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Tipler and Mosca - Physics for S&E 6/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 3 / 10

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

Last Saved : n/a Saving...  ()

Question
Points
1 2 3 4 5 6
1/1 1/1 –/3 –/2 1/1 –/2
Total
3/10 (30.0%)
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1. 1/1 points  |  Previous Answers Tipler6 4.P.094. My Notes
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1/1
 
Consider the ideal Atwood's machine below. When N washers are transferred from the left side to the right side, the right side descends 1.96 cm in 0.10 s. Find N.
Correct: Your answer is correct.

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2. 1/1 points  |  Previous Answers My Notes
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1
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1/50
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1/1
 
A 13 kg block is suspended from the ceiling of an elevator by a cord rated to withstand a tension of 232 N. Shortly after the elevator starts to ascend, the cord breaks. What was the minimum acceleration of the elevator when the cord broke?
Correct: Your answer is correct. m/s2

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3. /3 points Tipler6 4.P.045.soln. My Notes
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1 2 3
/1 /1 /1
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/3
 
To train astronauts to work on the moon, where the free-fall acceleration is only about 1/6 of that on Earth, NASA submerges them in a tank of water. If an astronaut, who is carrying a backpack, air conditioning unit, oxygen supply, and other equipment, has a total mass of 230 kg, determine the following quantities.

her weight on Earth (including backpack, etc.) kN
her weight on the moon (including backpack, etc.) N
the required upward buoyancy force of the water during her training for the moon's environment on Earth kN

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4. /2 points My Notes
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/1 /1
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/2
 
A simple accelerometer can be made by suspending a small massive object from a string attached to a fixed point on an accelerating object. Suppose such an accelerometer is attached to point P on the ceiling of an automobile traveling in a straight line on a flat surface at constant acceleration. Due to the acceleration, the string will make an angle θ with the vertical.
(a) Show that the magnitude of the acceleration a is related to the angle θ by a = gtanθ. (Do this on paper. Your instructor may ask you to turn in this work.)

(b) Suppose the automobile brakes steadily to rest from 48 km/h over a distance of 59 m. What angle will the string make with the vertical?
°
Will the suspended object be positioned below and ahead or below and behind point P during the braking?
    

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5. 1/1 points  |  Previous Answers Tipler6 4.IE.001. My Notes
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Mass on Two Strings


A block of mass M = 12 kg is suspended at rest by two strings attached to walls, as shown in the figure. The left string is horizontal and the right string makes an angle θ = 42° with the horizontal. What is the tension in the left string? (Assume the ring where the strings come together is massless.)
Tleft = Correct: Your answer is correct. N    

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6. /2 points Tipler6 4.P.073. My Notes
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/1 /1
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/2
 
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