Afather (mf = 85 kg) and his daughter (md= 45 kg) stand on a flat frozen lake of negligible friction. they hold a 14 ­m­ long rope stretched between them. the father and daughter then pull the rope to bring them together. if the father is initially standing at the origin, how far from the origin will they meet?

Explain the doppler effect in terms of frequency, wavelength, and speed.

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.)

What is required for an electric charge to flow through a wire? zero resistance in the wire a balance of electric potential high resistance in the wire a difference in electric potential