Blog

The velocity of a particle moving along the x axis changes from vi to vf . For which values of vi and vf is the total work done on the particle positive?

A wheel starts from rest and reaches an angular speed of 6.0 rad/s while turning through 2.0 revolutions.  What is the average angular acceleration of the wheel?

If you do work on an object in one-third the usual time, your power output is

A woman is pushing a box along the ground. She is exerting a horizontal force of 156 N on the box. The box has a mass of 84.0 kg, . If the coefficient of kinetic friction between the box and the ground is 0.16, what is the acceleration of the box? ( g = 9.8 m/s2)

A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?

An object moving in the +x axis experiences an acceleration of 2.0 m/s2. This means the object is:

Two equal mass balls (one red and the other blue) are dropped from the same height, and rebound off the floor.  The red ball rebounds to a higher position.  Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

A large cannon is fired from ground level over level ground at an angle of 30◦ above the horizontal. The muzzle speed is 980m/s. Neglecting air resistance, the projectile will travel what horizontal distance before striking the ground?

A container of water is lifted vertically 3.0 m then returned to its original position.  If the total weight is 30 N, how much work was done?

A 10-kg mass is moving with a speed of 5.0 m/s.  How much work is required to stop the mass?