Two flashlights are directed at a wall from different distances. the flashlights have the same strength of bulbs and of batteries. when the flashlights are turned on, which is expected to appear brighter on the wall? how does this analogy relate to stars?

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Explain what happens at the saturation point when adding salt to water at room temperature.

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: