Calculate the gravitational potential energy of a 1200 kg car at the top of a hill that is 42 m high.

A 1500 kg wrecking ball hangs from a 16-m-long cable. The ball is pulled back until the cable makes an angle of 24.0 ∘ with the vertical. By how much has the gravitational potential energy of the ball changed?

What must be true about tow objects if heat is flowing between them?

A 15m long wire is placed horizontally on the surface of a liquid and is gently pulled up with the force of 60N to keep the wire in equilibrium. what is the surface tension of the liquid?

Suppose you had one cup each of ice cream, steamed milk, packed snow, and boiling water. Which things would have more thermal energy than one cup of cooking oil that is at room temperature? Choose all answers that are correct. A. ice cream B.

A copper bar of length h and electric resistance r slides with negligible friction on metal rails that have negligible electric resistance (see figure below. the rails are connected on the right with a wire of negligible electric resistance

What is a sedimentary rock consisting of material that was precipitated from water

The path of a beam of light from the sun to your eye when you are wearing sunglasses

The element that is most abundant in earth is

What is true about coal as an energy source

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m