A block of mass 10.0 kg sits at rest on a ramp. The ramp makes a 30.0° angle with the horizontal. The coefficients of static and
kinetic friction between the ramp and the block are 0.700 and
0.200, respectively. The magnitude of the friction force the ramp
exerts on the block is
59.4 N
O 17.0N
84.9 N
49.0 N

The dot diagram represents the motion of the motorcycle as it moves from left to right

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

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?