5995

Physics Rotational Mechanics Level: Misc Level

A person with a mass of 64 kg sits at a distance of 1.5 m from the pivot point on a 5.0-m seesaw. Where would a person with a mass of 72 kg have to sit tobalan ce the seesaw?

5945

Physics Rotational Mechanics Level: Misc Level

The center 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:

5943

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 and at a distance of 10 cm from the cylinders central axis. The rotational inertia of the cylinder about the parallel axis is:

5938

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 object reach the bottom of the incline.

5936

Physics Rotational Mechanics Level: Misc Level

A unifrom 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 unifrom sphere is 2/5 mr2

5935

Physics Rotational Mechanics Level: Misc Level

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

5930

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 disk starts from rest and rotates at 120 rev/min in 10 s. Find the torque, assuming it to be a constant.

5897

Physics Rotational Mechanics Level: Misc Level

A 4.00 kg object is attached to a vertical rod by two strings. as in Figure P6.11. The object rotates in a horizontal circle at constant speed 6.00 m/s.Find the tension in (a) the up-per string and (b) the  lower string.

5746

Physics Rotational Mechanics Level: Misc Level

Using the laws of momentum and energy show the initial velocity of a ballistic pendulum is given by $\frac{(M+m))}{m}\sqrt{2gh}$

5584

Physics Rotational Mechanics Level: Misc Level

A diver can change her rate of rotation in the air by tucking her head in and bending her knees.Let,s assume that when she is stretched out straight she is rotating at 1 revolution per second. Now she goes in the tuck and bends effectivly shortening the length of her body half. What will her rate of rotation be now?

a) 5 hz

b)4 hz

5582

Physics Rotational Mechanics Level: Misc Level

A hoop of radius 0.5 m and a mass of 0.2 kg is released from rest 5 meters above the horizontal and allowed to roll down an inclined plane.How fast is it moving when it is 2 meters above the horizontal

a) 5.4 m/s

b) 3.8 m/s

c) 7.7 m/s

d) 2.2 m/s

5581

Physics Rotational Mechanics Level: Misc Level

A force is applied to the end of a 2 ft long unifrom board weighing 50 Ib, in order to keep it horizontal, while it pushes against a wall at the left. If the angle the force makes with the board is 30o in the direction show, the magitude of the applied force F is?

5580

Physics Rotational Mechanics Level: Misc Level

A wheel with a rotational inertia of 8.0 kg m2 and a rotational kinetic energy of 155 joules requires what torque to bring it to rest in 4.0 s?

5517

Physics Rotational Mechanics Level: Misc Level

A torque acting on a body tends to produce.

5475

Physics Rotational Mechanics Level: Misc Level

A particle whose mass is 3 kg moves in the xy plane with a constant speed of 4 m/s along the direction r=i+j . what is the angular momentum in (kg x m^2 /s) realtive to the point (0,4.0) meters?

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