Sun 28 Sep, 2014 03:53 pm - A 48-kg ice skater moves across the ice at a constant speed of 2.0 m/s. She is caught by her 75-kg partner, and then the pair continues to glide together. He is at rest when he catches her, and... (view)
Sun 28 Sep, 2014 03:51 pm - All three disks are made of sheet metal of the same material, and the diameters are 1.4m , 2.8m , and 4.2m . Assume that the x-axis has its origin at the left-most point of the left-most object and... (view)
Sun 28 Sep, 2014 03:37 pm - Two blocks are hung by a string draped over a pulley, a 1.3-kg block on the left and a 3.4-kg block on the right. The two blocks start out at rest and at the same height.
What is the... (view)
Sun 28 Sep, 2014 03:11 pm - A(n) 8.1-kg object is sliding across the ice at 2.34 m/s in the positive x direction. An internal explosion occurs, splitting the object into two equal chunks and adding 19J of kinetic energy to... (view)
Fri 26 Sep, 2014 01:09 pm - A student runs an experiment with two carts on a low-friction track. As measured in the Earth reference frame, cart 1 (m = 0.57kg ) moves from left to right at 1.0 m/s as the student walks along... (view)
Fri 26 Sep, 2014 01:08 pm - A 5.7-kg steel ball is dropped from a height of 25m into a box of sand and sinks 0.20m into the sand before stopping. How much energy is dissipated through the interaction with the sand? (view)