Charlie is playing with his daughter torrey in the snow. she sits on a sled and asks him to slide her across a flat, horizontal field. charlie has a choice of (a) pushing her from behind by applying a force downward on her shoulders at 30^\circ below the horizontal (fig. a), or (b) attaching a rope to the front of the sled and pulling with a force at 30^\circ above the horizontal (fig. b). which would be easier for him and why?

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.

How do you know how many valence electrons an atom has?

The law of entropy can also be called the law of increasing disorder, but this law seems to contradict the existence of living organisms that are able to organize chemicals into organic molecules. prepare for a class debate on the validity of the following arguments: a. living things are not subject to the laws of thermodynamics. b. the increase in the universe's entropy due to life processes is greater than the decrease in entropy within a living organism.