Physics Rotational Mechanics Level: Misc Level

When a car is weighed , it is allowed to move over a scale which records a reading as the frnt wheels go over the scale, and a second reading when the rear wheels go over the scale. The weight of the car is equal to;

a. The weight under the frnt wheels.

b. The weight under the rear wheels.

c.The average of the two weights.

d. The sum of the two weights.

Physics Rotational Mechanics Level: Misc Level

A man is holding an 8.00-kg vacuum cleaner at arm,s length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is horizontal?

a.4.40 Nm

b.43.2 Nm

c. 14.5 Nm

d. 0 Nm

Physics Rotational Mechanics Level: Misc Level

A pulley 320 mm in diameter and rotating initially at 4 rev/s receives a constant angular acceleration of 2 rad/s (squared). What is the linear velocity of a belt around the pulley after 8 s? What is the tangential acceleration of the belt?

Physics Rotational Mechanics Level: Misc Level

A wheel initially rotates at 6 rev/s and then undergoes a constant angular acceleration of 4 rad/s (squared).What is the angular velocity after 5 s? How many revolutions will the wheel make?

Physics Rotational Mechanics Level: Misc Level

A belt is wrapped around the edge of a pulley that is 40 cm in diameter. The pulley rotates with a constant angular acceleration of 3.50 rad/s(squared).At t=0, the rotational speed is 2 rad/s. What are the angular displacement and angular velocity of the pulley 2 s later.

Physics Rotational Mechanics Level: Misc Level

For the wheel problem 11.8 (see below for problem 11.8) what is the angular acceleration? What is the linear acceleration of a point on the edge of the wheel?

Physics Rotational Mechanics Level: Misc Level

A cylindrical piece of stock 6 in.in diameter rotates in a lathe at 800 rev/min. what is the linear velocity at the surface of the cylinder?

Physics Rotational Mechanics Level: Misc Level

A bucket is hung from a rope that is wrapped many times around a circular drum of radius 60 cm.The bucket starts from rest and is lifted to a height of 20 m in 5 s.

(a) How many revolutions were made by the drum?

(b) What was the average angular speed of the rotaing drum?

Physics Rotational Mechanics Level: Misc Level

An electric motor turns at 600 rpm. What is the angular velocity? What is the angular displacement after 6 s?

Physics Rotational Mechanics Level: Misc Level

A cable is wrapped around a drum 80 cm in diameter. How many revolutions of this drum will cause an object attached to the cable to move a linear distance of 2 m? What is the angular displacement?

Physics Rotational Mechanics Level: Misc Level

While whirling around in a vertical circle with a radius of 1.50 meters, a 2.00 kg mass is held on a rope attached to a very light spring scale. What value does the scale read when the mass is moving at 4.00 m/s at the lowest point in its orbit?

Physics Rotational Mechanics Level: Misc Level

Two wheels with rotational inertias 1.0 kg m2 and 1.5 kg m2 are rotating on the same axis at 20 rad/s and 12 rad/s respectively, in opposite directions. If the wheels are suddenly coupled together, find the common angular speed of the wheels after coupling.

a.0.80 rad/s

b.9.1 rad/s

c.0.40 rad/s

d.0.57 rad/s

Physics Rotational Mechanics Level: Misc Level

Find the kinetic energy of a cylindrcal shaft of mass 2.0 kg and radius 10 cm rotating about its central axis at 600 rad/s.

a. 1800J

b.18000J

c.1200J

d.12000J

Physics Rotational Mechanics Level: Misc Level

A uniform solid sphere of mass 5 kg and radius 30 cm is rotating about an axis through its center at the rate of 180 rev/min. Find the kinetic energy of the sphere. The rotational inertia of a uniform sphere is 2/5 mr^{2}.

a.16 /J

b. 64/j

c.32 /J

d. 24/J

Physics Rotational Mechanics Level: Misc Level

The center of mass of three objects is located at (1,0). One object with a mass of 5.0 kg is at(-2,-1) and a second object with a mass of 2.0 kg is at (0,0).Find the coordinates of the third mass of 3.0 kg.

a. (1.7,6.7)

b. (1.3,5.3)

c. (6.7,1.7)

d.(2.0,6.0)