Blog

Vector  V is 8.5 units long and points at  600 to the positive x axis.  What are the x and y components of this vector?

  A football field is 120 yd long and 50 yd wide. What is the area of the football field, in m 2, if 1 yd = 91.44 cm?  

A man pulls a sled along a rough horizontal surface by applying a constant force F at an angle θ above the horizontal. In pulling the sled a horizontal distance d, the work done by the man is:

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about

The mass of an object:

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?