During each cycle, a refrigerator ejects 625 kj of energy to a high-temperature reservoir and takes in 550 kj of energy from a low-temperature reservoir. a. explain how a fridge works. b. what are the known variables? c. what equation(s) could we use here? d. determine the work done on the refrigerant in each cycle. e. how efficient is this refrigerator?

What should the power status of a circuit be when measuring resistance with an ohmmeter?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

If steel is more dense that lake water, why can a boat float