Which has greater kinetic energy: a tennis ball that has a mass of 0.3kg travelling at 80m/s or a train that has a mass of 1kg and is moving at 0.1m/s? tennis balltrain

The plum pudding model of the atom states that ?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

The speed of light can be used to measure the