A train is speeding down a railroad track at a speed of 50 miles per hour. From whose reference point is the train not moving? OA. a person sitting on the tracks 1 mile in front of the train
ОВ. a person standing to the side of the railroad tracks
OC. a person sitting on the tracks 1 mile behind the train
OD. a person sitting on the train​

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.

Which governments provide garbage collection services to homes and businesses