7952

Physics Rotational Mechanics Level: Misc Level

The wheels of Andrea,s car had a diameter of 44 inches.If she was traveling at 34 miles per hour, what was the velocity of the wheels in radians per minute?


7951

Physics Rotational Mechanics Level: Misc Level

The wheels of Andrea,s car had a diameter of 44 inches.If she was traveling at 34 miles per hour, what was the velocity of the wheels in radians per minute?


7572

Physics Rotational Mechanics Level: Misc Level

A uniform spherical shell, with mass M and radius R, rotates about a vertical axis on frictionless bearings. A light string passes around the equator of the shell, over a massless,frictionless pully, and is attached to a small object of mass m.How long does it take the small object to fall a distance h?


7560

Physics Rotational Mechanics Level: Misc Level

On the basis of conservation of angular momentum, discuss why a helicopter must have more that one rotor(or propeller). Discuss two or more ways in which the second rotor (or propeller) can operate in order to keep the body of the helicopter stable.


7559

Physics Rotational Mechanics Level: Misc Level

Stars originate as large bodies of slowly rotaing gas.Because of gravity, these clumps of gas slowly decrease in size.What happens to the angular velocity of a star as it shrinks?Explain.


7558

Physics Rotational Mechanics Level: Misc Level

Derive an expression for the horizontal linear momentum impulse delivered to the rod by the pivot during the collision.


7557

Physics Rotational Mechanics Level: Misc Level

Derive an expression for the maximum angle of deflection of the rod after the collision


7556

Physics Rotational Mechanics Level: Misc Level

Derive an expression for the angular velocity of the rod+bullet (about the pivot) immediately after the collision.


7554

Physics Rotational Mechanics Level: Misc Level

A Yo-Yo sits initially at rest on a table top. The coefficient of static friction between the Yo-Yo and surface of the table is 6/10. The Yo-Yo consists of two disks with a rather thick central spindle, around which is wrapped some string of negligible mass.the moment of inertia of the Yo-Yo is 2/5 m R^2; where R is the outer radius of the Yo- Yo and M is its mass.The radius of the spindle is R/4. Neglect the thickness of the thin'' massless'', string.

A Persion pulls straight up on the string with an applied force F.

What is the largest HORIZONTAL acceleration thatcan be given to the Yo-Yo by this method.Express your answer as a multiple of g.


7424

Physics Rotational Mechanics Level: Misc Level

Three point mass particles are located in a plane;3. 61 kg located at the origin, 5. 8121 kg at [(6.72 cm); (13.44 cm)], and 1. 7328 kg at [(18.2112 cm); (0 cm)].How far is the center of mass of the three particles from the origin?Answer in units of cm.


7356

Physics Rotational Mechanics Level: Misc Level

A rotating 5 kg solid flywheel (disk) has a radius of 50 cm and an angular velocity of 20 rads/second. The wheel is brought to rest and all of the rotational energy of the flywheel goes into heating a surrounding water bath.If the water temperature increases 0.2 degrees celcius, what is the mass of the water surrounding the flywheel?


7339

Physics Rotational Mechanics Level: Misc Level

A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s.By changing the position of her arms, the skater decreases her moment of inertia by 50%. What is the skater,s final angular speed?


7338

Physics Rotational Mechanics Level: Misc Level

A string is wrapped around a pulley of radius 0.10 m and moment of inertia 0.15 kg.m2 The string is pulled with a force of 12 N. What is the magnitude of the angular acceleration of the pulley?


7337

Physics Rotational Mechanics Level: Misc Level

A 50 N.m torque acts on a wheel of moment of inertia 150 kg. m2. If the wheel starts from rest, how long will it take the wheel to make one revolution?


7336

Physics Rotational Mechanics Level: Misc Level

A meter stick is pivoted at the 0.50-m line. A 3.0-kg object is hung from the 0.10-m line.Where should a 5.0-kg object be hung to achieve equilibrium?


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