Physics Rotational Mechanics Level: Misc Level
A massless meterstick has a 5 kg ball attached at each end. How much torque will be needed to give the meterstick a rotational acceleration of 6 rad /s^2 about its midpoint?
Physics Rotational Mechanics Level: Misc Level
A wooden plank is 2 meters long. One end is resting atop a deck, while someone holds the other end up. 40 I b s of stone are sat 0.6 m away from the end that someone is holding up. Ignoring how much the plank weighs, how much force does the person have to exert to hold their end up?
Physics Rotational Mechanics Level: Misc Level
A Sit and Spin Wheel has a radious of 0.3 m and a rotational inertia of 15 kg m ^2. If a 10 N force is applied along the outer edge, what will the rotational acceleration be?
Physics Rotational Mechanics Level: Misc Level
A 50 kg rider on a moped of mass 75 kg is traveling with a speed of 20 m /s. Each of the two wheels of the moped has a radius of 0.2 m and a moment of inertia of 0.2 kg * m2. What is the total rotational kinetic energy of the wheels?
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.
Physics Rotational Mechanics Level: Misc Level
The string in the Figure is L= 100.0 cm long and the distance d to the fixed peg P is 72.0 cm. When the ball is released from rest in the position shown, it will swing along the dashed arc. How fast will it be going when it reaches the lowest point in its swing? How fast will it be going when it reaches the highest point in its swing?
Physics Rotational Mechanics Level: Misc Level
A Ferris wheel, 22.4 m in diameter, rotates once every 12.5 s. What is the fractional change in a person's apparent weight at the top, as compared to her weight at rest?
Physics Rotational Mechanics Level: Misc Level
At what minimum speed must a roller coaster be traveling when upside down at the top of a circle if the passengers are not to fall out ? Assume a radius of curvature of 9.07 m.
Physics Rotational Mechanics Level: Misc Level
A horizontal force of 261 N is exerted on a 2.05 kg discus as it is rotated uniformly in a horizontal circle ( at arms length )of radius 1.16 m. Calculate the speed of the discus.
Physics Rotational Mechanics Level: Misc Level
Jeff weighs 240 N sits alone on outer edge turning at 30 rpm. if he sits in the center how fast will the merry go round go?
Physics Rotational Mechanics Level: Misc Level
Suppose 3 rd kid hops on and all sit on outer edge: what is rotational inertia of loaded merry go round?
Physics Rotational Mechanics Level: Misc Level
If the merry go round has a rotational inertia of 20 kg m^2 what is its rotational acceleration?
Physics Rotational Mechanics Level: Misc Level
A seesaw is 4 m long and pivots in the middle: Sally weighs 240 N and sits at one end ( on the ground ) while suzi who weighs 160 N sits on the other end : billy a friend comes a long weighing 120 N :where should billy sit to balance the seesaw?
Physics Rotational Mechanics Level: Misc Level
You need to open a heavy door that is 30 inches wide.You push near the edge that is farthest from the hinges. If you had pushed at point 10 inches in from the hinges: how much harder would you have to push to open the door at the same speed. Why?
Physics Rotational Mechanics Level: Misc Level
Suppose a revolving door at the mall is spinning around once every 4 seconds. As you walk through, you push on the door for 3 seconds, which increases the rotationl speed so that it rotates once per second. what is the rotatinal acceleration due to the push?
