An 8.10 kilogram box of mass is kept at a height of 0.99 meters above ground level. what is the potential energy of the box? (given g = 9.8 meters/second2). a. 68 joules. b. 79 joules. c. 81 joules. d. 99 joules. e. 1.0 × 102 joules

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false

Agirl throws a ball. if the ball's acceleration is 12 m/sec/sec and its mass is 0.5 kg, how much force did the girl apply to the ball?