Torque

A disk with a mass of 50 kg and radius of 0.4 m is rotated about its axis by a motor. The disk starts from rest and ortates a 120 rev/min in 10s. What is the torque assuming it to be constant?

The gauge pressure at a depth of 17 m in water is equal to what?

The gauge pressure at a depth of 17 m in water is equal to what?

Velocity after collision

An object with a mass of 2 kg traveling with a velocity of 3 m/s, collides head on and elastically witha stationary object of mass 0.5 kg. The velocity of the 2 kg mass after collision is what?

Collisions.

A 3 kg bowling ball traveling with a velocity of 3 m/s collides head on with another bowling ball of the same mass traveling with a velocity of -2 m/s. If the collision is perfectly elastic, the velocities of the bowling balls after the collsion is what?

Mechanics: Conservation of momentum on variable mass system

Sand from a stationary hopper falls onto a moving conveyor belt at the rate of 5.00 kg/s as in the figure. The conveyor belt is supported by frictionless rollers and moves at a constant speed of 0.750 m/s under the action of a constant horizontal external force Fext supplied by the motor that drives the belt. Find (a) the san ...continues

Physics

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them (Fig. P9.4). A cord initially holding the blocks together is burned; after this, the block of mass 3M moves to the right with a speed of 1.50 m ...continues

A tennis player receives a shot with the ball...

A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 50.0 m/s and returns the shot with the ball traveling horizontally at 36.0 m/s in the opposite direction. (Assume the initial direction of the ball is in the -x direction.) (a) What is the impulse delivered to the ball by the racquet? i N · ...continues

Force Impulse and Projectile Motion

In a slow-pitch softball game, a 0.200 kg softball crossed the plate at 20.00 m/s at an angle of 35.0° below the horizontal. The batter hits the ball toward center field, giving it a velocity of 40.0 m/s at 30.0° above the horizontal. (a) Determine the impulse delivered to the ball. (b) If the force on the ball increases ...continues

A golf ball (m = 46.0 g) is struck with a force...

A golf ball (m = 46.0 g) is struck with a force that makes an angle of 45.7° with the horizontal. The ball lands 207 m away on a flat fairway. If the golf club and ball are in contact for 7.06 ms, what is the average force of impact? (Neglect air resistance.)

Intensity of sound

The intensity of sound at a given point is measured to be .0005 W/m^2. what is the decibel level of the sound?