The motor of a boat develops 32 kW when the boat's speed is 16 km/h. With how much force does the water resist the motion of the boat?

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)