Plz ! the correct answer gets brainleast! which would roll down a slanted desktop more quickly, a ballpoint pen full of ink or a ballpoint pen after it has run out of ink? (note: assume that the total mass of an object does not affect the rate at which it rolls.) a. the pen full of ink will always win the race. b. the empty pen will always win the race. c. the empty pen will win if the incline is steep, and the full pen will win if the incline is gentle. d. the full pen will win if the incline is steep, and the empty pen will win if the incline is gentle.

Anybody wanna ? (picture included? )

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?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)