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Griffith - The Physics of Everyday Phenomena 7/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 0 / 13

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

Last Saved : n/a Saving...  ()

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1. 0/1 points  |  Previous Answers GrifEP7 3.CQ.31. My Notes
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0/1
 
The diagram below shows a wastebasket placed behind a chair. Three different directions are indicated for the velocity of a ball thrown by the kneeling woman. Which of the three directions—A, B, or C—is likely to result in the ball landing in the basket? (Select all that apply.)
Incorrect: Your answer is incorrect.

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2. –/2 points GrifEP7 3.E.10. My Notes
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1 2
–/1 –/1
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–/2
 
Suppose that the gravitational acceleration on a certain planet is only 2.5 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 25 m/s.
(a) What is the velocity of the ball 4 seconds after it is thrown?
m/s

(b) How much time elapses before the ball reaches the high point in its flight?
s
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3. –/3 points GrifEP7 3.SP.06. My Notes
Question Part
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1 2 3
–/1 –/1 –/1
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–/3
 
An archeologist is running at 4 m/s with her hands outstretched above her head (1.80 m from feet to fingertips) while being chased by a tiger. She runs exactly horizontally off of a chasm and attempts to grab onto the opposite side.
(a) If the chasm is 4.80 meters wide, how long does she take to cover this distance?
s

(b) During this time, what distance has she fallen vertically (use g = 10 m/s2)?
m

(c) How far above or below the edge of the opposite side do her fingertips fall? (Use + to indicate distances above the edge and − to indicate distances below the edge.)
m
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4. –/2 points GrifEP7 4.CQ.29. My Notes
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–/2
 
This question is no longer available. Ask your instructor to remove it from the assignment. Help
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5. –/1 points GrifEP7 5.CQ.06. My Notes
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–/1
 
A ball on the end of a string is whirled with constant speed in a counterclockwise horizontal circle. At point A in the circle, the string breaks. Which of the curves sketched below most accurately represents the path that the ball will take after the string breaks (as seen from above)? Explain.
    
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6. –/2 points GrifEP7 13.E.08. My Notes
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In the circuit shown below, the r = 3-Ω resistance is the internal resistance of the battery and can be considered to be in series, as shown, with the battery and the R = 8-Ω load. (Let e m f = 2 V.)
(a) What is the current flowing through the 8-Ω resistor?
A

(b) What is the voltage difference across the 8-Ω resistor?
V
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7. –/2 points GrifEP7 15.E.04. My Notes
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A wave on a rope is shown in the diagram. (Let L = 7 m.)
(a) What is the wavelength of this wave?
m

(b) If the frequency of the wave is 3.0 Hz, what is the wave speed?
m/s
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