While you are standing still on the sidewalk, you are passed by an ambulance traveling at 20.00 m/s. The ambulance’s siren produces a tone at a frequency of 950.0 Hz. The speed of sound in air is 343.0 m/s. What frequency do you hear as the ambulance approaches you?
What frequency do you hear as the ambulance moves away from you?

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?