Spring Unit 2 Test Review - Rotational Motion

An electric fan spins at high speed with an angular velocity of 13 rad/s. If the fan starts at low speed of 3.7 rad/s and has angular acceleration of 0.47 rad/s². How long does it take to reach max angular velocity?

• 21 seconds

• 15 seconds

• 20 seconds

• 5 seconds

An electric fan spins at high speed with an angular velocity of 13 rad/s. If the fan starts at low speed of 3.7 rad/s and has angular acceleration of 0.47 rad/s². How many radians does it turn before reaching max velocity?

• 80 radians

• 90 radians

• 165 radians

• 110 radians

What is the torque if a 2 N force is applied perpendicular at approximately 15 cm for the axis of rotation?

• 0.3 Nm

• 0.2 Nm

• 0.15 Nm

• 0.1 Nm

A merry-go-round is spinning out of control. It is being pushed by Fenton, Anthony, and Nico. Starting from rest, they are able to spin it up to 27.8 RPM. If it travels 4 revolutions in the time it takes to reach this speed, what is the angular acceleration?

• 0.5 rad/s²

• 0.2 rad/s²

• 2.0 rad/s²

• 3.5 rad/s²

Reid is going to tighten a lug nut with a torque wrench. If he is applying a 15.7 N force at 38.23 cm from the axis, and an angle of 57.8° as shown, what is the Torque?

• 8.0 Nm

• 5.1 Nm

• 7.8 Nm

• 7.7 Nm

Taran is driving his truck around the curve in Leo, IN. If the curve has a radius of 45 m, the coefficient of friction is 0.75, and the truck has a mass of about 2068.2 kg. (We are making an assumption that the curve is level) a. What is the maximum amount of friction that the truck can withstand without sliding while going around the curve?

• a) 15200 N

• b) 15000 N

• c) 15300 N

• d) 15400 N

Taran is driving his truck around the curve in Leo, IN. If the curve has a radius of 45 m, the coefficient of friction is 0.75, and the truck has a mass of about 2068.2 kg. (We are making an assumption that the curve is level) b. What is the maximum amount of centripetal force that the truck can feel without sliding?

• a) 15200 N

• b) 15000 N

• c) 20000 N

• d) 30000 N

Which of the following forces acts towards the center of a circular path?

• Force of gravity

• Normal force

• Force of friction

• Centripetal force

Ricky Bobby is driving around a curve at Talladega Superspeedway. If the curve has a radius of 410 m and banked at 33 degrees, the coefficient of friction is 0.769, and the truck has a mass of about 1542 kg. What is the ideal velocity that Ricky Bobby must go so that his car experiences zero friction?

• 27.3 m/s

• 51.1 m/s

• 42.8 m/s

• 48.2 m/s

Ricky Bobby is driving around a curve at Talladega Superspeedway. If the curve has a radius of 410 m and banked at 33 degrees, the coefficient of friction is 0.769, and the truck has a mass of about 1542 kg. What is the centripetal acceleration felt by his car?

• 5.2 m/s²

• 6.4 m/s²

• 15 m/s²

• 20 m/s²