Imagine you have a buzzer that heats up as it runs. If 20 J are input to the system and 5 J are used for the buzzer and 15 J are used to heat the surroundings, what is the efficiency of the buzzer

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Which statement best explains why the overall charge on an atom is zero?