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Serway and Faughn - College Physics 6e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 10

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

Last Saved : n/a Saving...  ()

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    Here are some textbook questions from College Physics 6/e by Serway and Faughn published by Brooks/Cole Publishing. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and makes the answer key available after the first submission so you can see the correct answers. (Typically, the answer key is posted after the due date!)

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1. –/2 points SF6 1.P.048. My Notes
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The radius of a certain ringed planet is 5.95 ✕ 107 m, and its mass is 5.64 ✕ 1026 kg.


Figure P1.48

(a) Find the density of this planet (its mass divided by its volume) in grams per cubic centimeter. (The volume of a sphere is given by (4/3)πr3.)
g/cm3
(b) Find the surface area of this planet in square feet. (The surface area of a sphere is given by 4πr2.)
ft2
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2. –/2 points SF6 2.P.012. My Notes
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–/2
 
A tortoise can run with a speed of 13.0 cm/s, and a hare can run 20 times as fast. In a race, they both start at the same time, but the hare stops to rest for 5.0 minutes. The tortoise wins by a shell (30 cm).
(a) How long does the race take?
s
(b) What is the length of the race?
m
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3. –/3 points SF6 3.P.024. My Notes
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–/3
 
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is h = 50.0 m above a flat horizontal beach, as shown in Figure P3.24.


Figure P3.24

How long after being released does the stone strike the beach below the cliff?
s
With what speed and angle of impact does it land?
m/s (speed)
° (below the horizontal)
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4. 2/2 points  |  Previous Answers SF6 4.QQ.007. My Notes
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2/2
 
Consider the two situations shown below, in which there is no acceleration. In both cases, all individuals pull with a force of magnitude F.

Is the reading on the scale in part (i) of the figure greater than, less than, or equal to the reading in part (ii)?
     Correct: Your answer is correct.

Explain.
Key: The scale is in equilibrium in both situations, so it experiences a net force of zero. Because each person pulls with a force F and there is no acceleration, each person is in equilibrium. Therefore, the tension in the ropes must be equal to F. In case (i), the person on the right pulls with force F on a spring mounted rigidly to a brick wall. The resulting tension F in the rope causes the scale to read a force F. In case (ii), the person on the left can be modeled as simply holding the rope tightly while the person on the right pulls. Thus, the person on the left is doing the same thing that the wall does in case (i). The resulting scale reading is the same whether there is a wall or a person holding the left side of the scale.

Score: 1 out of 1

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5. –/1 points SF6 5.P.032. My Notes
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–/1
 
Three objects with masses, m1 = 5.0 kg, m2 = 10.0 kg, and m3 = 19.0 kg, are attached by strings over frictionless pulleys as indicated in Figure P5.32. The horizontal surface is frictionless and the system is released from rest. Using energy concepts, find the speed of m3 after it moves down 5.5 m.
m/s


Figure P5.32

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