A student accidentally drop a pear(m= .42 kg) how far does the pear Fall in 1.5 seconds

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.

What is the difference between mass density and weight density?

Cereal plants gain chemical potential energy as they grow. which form of energy is converted to create the chemical potential energy?