A marathon runner is running across a bridge. She has 10,000 J of kinetic energy, and she has 20,000) of potential energy because she is on the bridge (above the ground). What is her mechanical energy?
30,000
10.000
20,000
15,000

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Does heating a metal wire increase or decrease its electrical resistance? why?