Gary Foote
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Answered a Question in Math
I don't see the diagram so I can only guess. Work is done if there is a component of the force in the direction of motion. This would not be the case for the normal force, because by definition, it... 
Answered a Question in Science
If the pressure goes up, the volume goes down, assuming temperature is constant. This is Boyle's law. So the volume goes down by a factor of 2.5. Or, you can write v(1)xp(1) = v(2)xP(2). 2500/2.5 =... 
Answered a Question in Science
The velocity changes from 25 m/sec to 15 m/sec. This represents a change of 10 m/sec. An acceleration of 10m/sec/sec implies that there will be a change of 10 m/sec for every second the... 
Answered a Question in Physics
Thte way you have worded this, the ball is below the ceiling, so the potential energy with respect to the ceiling is negative. PE = mgh, and since the zero position is the ceiling, the potential...