What is the kinetic energy of a 55-kilogram skier traveling at 9.0 meters per second?
(1)2.5 × 102j
(2)5.0 × 102j
(3)2.2 × 103j
(4)4.9 × 103j

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?