Which of the following is not true about a pool of water and a piece of ice?

a. they have the same composition.
b. they are in different states of matter.
c. they have different chemical properties.
d. they have different physical properties.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.