Ablock of unknown mass is attached to a spring with a force constant of 6.50 n/m and undergoes simple harmonic motion with an amplitude of 10.0 cm. when the block is halfway between its equilibrium position and the end point, its speed is measured to be 30 cm/s. calculate a) the mass of the block, b) the period of the motion, and c) the maximum acceleration of the block.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

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)