PLEASE ANSWER QUICK!! A student pushes a wagon full of bricks with a constant force across the ground. Which of
the following changes would double the acceleration of the wagon?
A. Removing half of the mass in bricks from the back of the wagon
B. Pulling the wagon over grass instead of concrete
C. Reducing the initial force by half
D. Adding twice as many bricks to the back of the wagon

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)

Explain what will happen if decomposers were apsent from a forest ecoysystem.

Which statements did both aristotle and ptolemy assume? check all that apply.