PLS HELP What is the gravitational force acting on a 53 kg object standing on the surface of the Earth?

a) 5.3 N
b) 63N
c)48N
d) 530N

Which describe reflection? check all that apply. light bounces off a boundary.

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure