A glass is sitting on a table and does not move. Explain the forces acting on the glass that does not allow it to move.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

What sort of waves exhibit the doppler effect?

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?