The solar constant is a. the same for a sphere or for a circle. b. only about a quarter of all energy emitted by the sun. c. a consistent amount of energy received at the top of the atmosphere. d. the same value for all planets, even Neptune.

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

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?

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.