PHYS 204 Week 5 Homework
PHYS 204 Week 5 Homework Recent
Chapter 9
1 Convert 13 revolutions to (a) radians and (b) degrees.
7 A motor generates W of power. The torque necessary is 50.0 N m. Find the angular velocity.
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?
11 A gear train has 17 directly connected gears. Do the first and last gears rotate in the same direction?
13 A pulley of diameter 5.00 cm is driven at rpm. Find the diameter of a second pulley if it is driven by the first at rpm.
Chapter 10
3 A lever uses an effort arm of 2.75 m and has a resistance arm of 72.0 cm. What is the lever’s mechanical advantage?
7 A pulley system has a mechanical advantage of 5. What is the resistance force if an effort of 135 N is exerted?
9 What height must a 10.0-ft-long inclined plane be to lift a -lb crate with lb of effort?
10 A screw has a pitch of 0.0200 cm. An effort force of 29.0 N is used to turn a screwdriver whose handle diameter is 36.0 mm. What is the maximum resistance force?
11 A 945-N resistance force is overcome with a 13.5-N effort using a screwdriver whose handle is 24.0 mm in diameter. What is the pitch of the screw?