7051

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.

7050

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

6757

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?

6756

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?

6755

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.

6750

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?

6749

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?

6748

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?

6747

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?

6745

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?

6364

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?

6298

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.

6273

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

6224

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 mr2.

a.16 /J

b. 64/j

c.32 /J

d. 24/J

6218

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)

Displaying 31-45 of 497 results.