7297

Physics Rotational Mechanics Level: Misc Level

A 60 kg skater begins a spin with an angular spin speed of 6 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?

7296

Physics Rotational Mechanics Level: Misc Level

A 1 kg wheel in the form of a solid disk rolls along a horizontal surface with a speed of 6 m/s. what is the total kinetic energy of the wheel?

7295

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 resulting angular acceleration of the pulley?

7294

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?

7293

Physics Rotational Mechanics Level: Misc Level

A meter stick is pivoted at the 0.50-m line.A 3-kg object is hung from the 0.10-m line. Where should a 5-kg object be hung to achieve equilibrium?

7288

Physics Rotational Mechanics Level: Misc Level

A ball attached to a string starts at rest and undergoes a constant acceleration as it travels in a horizontal circle of radius 0.30 m.After 0.65 sec, the angular speed is 9.7 rad.s, what is the tangential acceleration of the ball?

7235

Physics Rotational Mechanics Level: Misc Level

A rod of length L is lying on the y-axis. If the linear density of the rod is (y)=Ay2, determine (a)the center of mass of the rod

(b) the moment of inertia about the center of mass and (c) the instaneous angular acceleration that would result if a force F (=Fi &#770;) were applied to the lower tip of the rod.

7234

Physics Rotational Mechanics Level: Misc Level

The marble rolls down a track and around a loop-the-loop of radius R. the marble has mass m and radius r (i.e; I= 2/5 mr2). That minimum height h must the track have for the marble to make it around the loop-the-loop without falling off?

7059

Physics Rotational Mechanics Level: Misc Level

An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?

a. It is reduced by a factor of two.

b. It is reduced by a factor of two.

c.It increases by a factor of two.

d. It increases by a factor of four.

7058

Physics Rotational Mechanics Level: Misc Level

The torque required to turn the crank on an ice cream maker is 4.50 Nm . How much work does it take to tum the crank through 300 full turns?

a. 4240 J

b. 8480 J

c. 1350 J

d.2700 J

7056

Physics Rotational Mechanics Level: Misc Level

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her boody and her moment of inertia decreases by 1/2. Her angular speed increases by a factor of;

a. 2.

b.4.

c.The square root of (2)

d. 1/2.

7055

Physics Rotational Mechanics Level: Misc Level

A uniform meter stick with a mass of 135 g rotates about an axis perpendicular to the stick passing through the center of the stick with an angular speed of 3.50 rad/s squared. What is the magnitude of the angular momentum of the stick?

a.0.0394 k x m squared/s.

b.0.473 k x m squared/s.

c. 0.158 k x m squared/s.

d. 0.0236 k x m squared/s.

7054

Physics Rotational Mechanics Level: Misc Level

A meter stick balances at the 50.0 -cm mark. If a mass of 50.0 g is placed at the 90.0-cm mark, the stick balances at the 61.3- cm mark. What is the mass of the meter stick?

a.127 g

b.178 g

c.32.6 g

d.73.4 g

7053

Physics Rotational Mechanics Level: Misc Level

An 82.0 kg -diver stands at the edge of a light 5.00-m diving board, which is supported by two pillars 1.60 m apart.Find the force exerted by pillar B;

a. 1.71 kN downward B;

b.1.71 kN upwards.

c.2.51kN downwards.

d.2.51 kN upwards.

7052

Physics Rotational Mechanics Level: Misc Level

A 320-g mass and a 400-g mass are attached to the two ends of a string that goes over a pulley with a radius of 8.70 cm. Because of friction, the pulley does not begin to rotate. What is the magnitude of the frictional torque on the bearing of the pulley if the system is in static equilibrium?

a.0.00683 Nm

b.0.614Nm

c.0.0626 Nm

d.0.000696 Nm

Displaying 16-30 of 497 results.