A500 kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. bob’s rope pulls to the left, 15° below horizontal, with 500 n of tension. ellen’s rope pulls toward the right, 25° below horizontal. what tension must ellen maintain in her rope to keep the piano descending vertically at constant speed? what is the tension in the vertical main cable supporting the piano?

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in