October 25th, 2007, 08:54 PM  #1 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0  Force and Motion 1. A box with mass of 50.0 kg is placed on the floor of an elevator. What force does the box exert on the floor when the elevator is accelerating upward at the rate of 2.0 m/sec^2? When it is accelerating downward at the rate of 3.0 m/sec^2? 2. A rifle bullet leaves the muzzle of a gun at 800 m/sec. The rifle barrel is 80 cm long, and mass of the bullet is 200 g. What force was needed to accelerate the bullet? Well, the two questions above were the ones that I need help on. Currently, I'm learning about force and motion. I know that F=ma, but I forgot about the types of forces, and other basic mathematical equations for force and motion topic. I would appreciate if anyone help me on this. Thanks, J. 
October 26th, 2007, 07:39 PM  #2  
Senior Member Joined: Dec 2006 Posts: 1,111 Thanks: 0  Quote:
Quote:
 
October 26th, 2007, 08:22 PM  #3 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
Thanks for the reply.


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