6216

Physics Rotational Mechanics Level: Misc Level

If a solid cylinder, a hoop and a solid sphere of the same mass are rolled down simultaneously from the same height on an inclined plane, in which order will the objects reach the bottom of the incline?

a. Cylinder, sphere, hoop

b. Sphere, cylinder, hoop

c. Cylinder, hoop,sphere

d. Hoop,cylinder,sphere


6215

Physics Rotational Mechanics Level: Misc Level

A solid cylinder of mass 8 kg and diameter 20 cm is rotated about an axis parallel to its central axis at a distance of 10 cm from the cylinder. The rotaional inertia of the cylinder about the parallel axis is:

a. 0.08 kg m2

b.0.12 kg m2

c.12 kg m2

d. 0.04 kg m2


6214

Physics Rotational Mechanics Level: Misc Level

A disk with a mass of 50 kg and radius 0.40 m is rotated about its axis by a motor. The flywheel starts from rest and rotates at 120 rev/min in 10 s. Find the torque, assuming it to be a constant.

a. 2.0 N/m

b.5.0 N/m

c. 1.5 N/m

d.3.0 N/m


6213

Physics Rotational Mechanics Level: Misc Level

The crankshaft of an engine is accelerated from rest at the uniform rate of 4.0 rad/s2 for 30 s. Find the rotational speed of the crankshaft at the end of 30 s in rev/min.

a. 190 rev/min

b. 19 rev/min

c. 1150 rev/min

d. 1900 rev/min


6167

Physics Rotational Mechanics Level: Misc Level

a uniform rod with length and mass is suspended by two thin strings as show in the figure inthe attachment .the rod in horizontal position. whic of the equations represents the initial angualr acceleration alpha of the rod when the string on the left of cut (hint: use parallel axis theorem)

a) (3mg)/(2I) b) (3mI)/(2g) c) (3I)/(2g) d) (3g)/I e) I/(2g) f)(3g)/ (2I) g) g/I h) (121)/mg


6166

Physics Rotational Mechanics Level: Misc Level

a figure skater is spinning with her arms and one leg extended as far she can. she then pulls them in tight to her body .sa her position contracts, her angular velocity----

a)decreases b)increases c) remains the same


6165

Physics Rotational Mechanics Level: Misc Level

a figure skater is spinning with her arms and one leg extended as far she can. she then pulls them in tight to her body .sa her position contracts, her rotaional kinetic energy--

a)decreases b) increase c)remains the same


6164

Physics Rotational Mechanics Level: Misc Level

a figure skater is spinning with her arms and one leg extended as far she can. she then pulls them in tight to her body .sa her position contracts, her moment of inertia--

a)decreases b) increases c) remains the same


6163

Physics Rotational Mechanics Level: Misc Level

a figure skater is spinning with her arms and one leg extended as far she can. she then pulls them in tight to her body .sa her position contracts, her angular momentum--

a) decreses b) increases c) remains the same--


6144

Physics Rotational Mechanics Level: Misc Level

 Two particles, each with mass m=1.80 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d=0.710 m and mass M=0.408 kg. The combination rotates around the rotation axis with angular speed &#969:=0403 rad/s. Measured about O,what are the combination,s (a) rotational inertia and (b) kinetic energy?


6143

Physics Rotational Mechanics Level: Misc Level

Starting from rest, a disk rotates about its central axis with constant angular acceleration.In 3.0 s,it rotates 29 rad. During that time, what is the instantaneous angular velocity of the disk at the end of the 3.0 s?


6130

Physics Rotational Mechanics Level: Misc Level

1. A flywheel has E= 900000 J radius =.5 m voiume=3.3765 m^3 density=7x10^3kg /m^3 Due to its radius and the material (steel) of the flywheel, the maximum angular velocity W max is 3000 revolutions per minute (rpm). Assuming that the flywheel has a 100% efficency, what is the maximum kinetic energy that can be stored in this flywheel)?


6086

Physics Rotational Mechanics Level: Misc Level

The truck, is initially at rest with a solid cylindrical roll of paper in the position shown, moves forward with a constant acceleration. Find the distance which the truck goes before the paper rools off the edge of its horizontal bed of length d=4 m. Friction is sufficient to prevent slipping. Give your answer in meters.


6048

Physics Rotational Mechanics Level: Misc Level

How fast does a car have to go in order to experience apparent weighlessness as it goes over a hill that has a radius of 30m?


6047

Physics Rotational Mechanics Level: Misc Level

A rollercoaster car with a mass of 700 kg goes through loop with a diameter of 25m. What is the minimum speed the car has to go through the loop in order not to fall?


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