Police radar equipment is used to detect the speed of objects. in one trial, the radar equipment records a stationary tree as traveling at 6 mph, although in another trial it records the tree as traveling at 0 mph. which of the following measurement problems exist in the radar equipment? correct answer(s) reliability construct validity accuracy

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

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?