Please help 4. A block of unknown
material is submerged in water.
Light in the water enters the block at an angle of
incidence of 31°. The angle of refraction of the light in
the block is 27°. What is the index of refraction of the
material of the block?

How would doubling the made of an object change the objects potential energy

Akg a of 55 m at an of 11 ? . if is at 98 km/h, be ?

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?