Applied Physics

Dale Ewen, Neill Schurter, Erik Gundersen

Chapter 9 Rotational Motion - all with Video Answers

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Chapter Questions

01:23

Problem 1

Convert 13 revolutions to (a) radians and (b) degrees.

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00:57

Problem 2

A bicycle wheel turns $25 \pi$ rad during 45 s. Find the angular velocity of the wheel.

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01:26

Problem 3

A lawn tractor tire turns at 65.0 rpm and has a radius of $13.0 \mathrm{cm} .$ Find the linear speed of the tractor in $\mathrm{m} / \mathrm{s}$.

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01:34

Problem 4

A model plane pulls into a tight curve of a radius of $25.0 \mathrm{m}$. The $30 \overline{0}$ -g plane is traveling at $90.0 \mathrm{km} / \mathrm{h}$. What is the plane's centripetal force?

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01:23

Problem 5

A 0.950-kg mass is spun in a circle on a string of radius 60.0 cm. If its centripetal force is $12.0 \mathrm{N},$ at what velocity does it travel?

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01:45

Problem 6

A girl riding her bike creates a torque of 1.20 lb $\mathrm{ft}$ with an angular speed of $45.0 \mathrm{rpm}$. How much power does she produce?

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01:08

Problem 7

A motor generates $300 \mathrm{W}$ of power. The torque necessary is $50.0 \mathrm{N} \mathrm{m} .$ Find the angular velocity.

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01:31

Two rollers are side by side, with the large one turning the small one. The diameter of the small one is $2.00 \mathrm{cm}$ and it turns at $15.0 \mathrm{rpm}$. The large roller has a diameter of $5.00 \mathrm{cm} .$ How many revolutions does it make in one minute?

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01:21

Problem 9

A clock is driven by a series of gears. The first gear has 30 teeth and rotates 60.0 times a minute. The second gear rotates at 90.0 rpm. How many teeth does it have?

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01:13

Problem 10

Two gears have 13 and 26 teeth, respectively. The first gear turns at 115 rpm. How many times per minute does the second gear rotate?

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01:39

Problem 11

A gear train has 17 directly connected gears. Do the first and last gears rotate in the same direction?

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01:31

Problem 12

A pulley of diameter $14.0 \mathrm{cm}$ is driven by an electric motor to revolve $75.0 \mathrm{rpm} .$ The pulley drives a second one of diameter $10.0 \mathrm{cm} .$ How many revolutions does the second pulley make in 1.00 min?

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01:22

Problem 13

A pulley of diameter $5.00 \mathrm{cm}$ is driven at $100 \mathrm{rpm} .$ Find the diameter of a second pulley if it is driven by the first at 250 rpm.

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02:00