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Chapter 4: Q. 41 (page 107)
II An electric fan goes from rest to in . What is its angular acceleration?
The angular acceleration of the fan is .
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14. A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point.
a. What was the bullet's flight time?
b. What was the bullet's speed as it left the barrel?
Problems 1 and 2 show a partial motion diagram. For each:
a. Complete the motion diagram by adding acceleration vectors.
b. Write a physics problem for which this is the correct motion diagram. Be imaginative! Don't forget to include enough information to make the problem completely and to state clearly what is to be found.
A long string is wrapped around a diameter cylinder, initially at rest, that is free to rotate on an axle. The string is then pulled with a constant acceleration of until of string has been unwound. If the string unwinds without slipping, what is the cylinder鈥檚 angular speed, in , at this time?
11. II A ball thrown horizontally at travels a horizontal distance of before hitting the ground. From what height was the ball thrown?
You鈥檝e been assigned the task of using a shaft encoder a device that measures the angle of a shaft or axle and provides a signal to a computer to analyze the rotation of an engine crankshaft under certain conditions. The table lists the crankshaft鈥檚 angles over a interval.
Is the crankshaft rotating with uniform circular motion? If so, what is its angular velocity in rpm? If not, is the angular acceleration positive or negative?
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