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Chapter 4: Q. 18 (page 106)
A boat takes 3.0 hours to travel down a river, then 5.0 hours to return. How fast is the river flowing?
The speed of the river is .
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24. I FIGURE EX4.24 shows the angular-position-versus-time graph for a particle moving in a circle. What is the particle's angular velocity at (a) , (b) , and (c) ?
A computer hard disk in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at for , then coasts at a steady angular velocity for another .
a. What is the speed of the dot at ?
b. Through how many revolutions has the disk turned?
A painted tooth on a spinning gear has angular acceleration , where t is in s. Its initial angular velocity, at , is . What is the tooth鈥檚 angular velocity in rpm at ?
12. In uniform circular motion, which of the following quantities are constant: speed, instantaneous velocity, the tangential component of velocity, the radial component of acceleration, the tangential component of acceleration? Which of these quantities are zero throughout the motion?
While driving north at during a rainstorm you notice that the rain makes an angle of with the vertical. While driving back home moments later at the same speed but in the opposite direction, you see that the rain is falling straight down. From these observations, determine the speed and angle of the raindrops relative to the ground.
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