This version of einstein’s equation is often used directly to find what value?
e = ∆mc2
a. the energy that is released in a nuclear reaction b. the mass defect
c. the mass that is lost in a fusion reaction
d. the potential energy of an object raised to a certain height e. the speed of light

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

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block