Which statement best describes the difference between speed and velocity? a. velocity is speed with a direction. b. speed is velocity with a direction. c. velocity is acceleration with a direction. d. velocity measures position, while speed does not.

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .