The balls shown have different masses and speeds. Rank the following from greatest to least:
a. The momenta
b. The impulses needed to stop the balls
9.0 m/s 8.5 m/s 12.0 m/s 2.0 m/s
1.0 kg 1.2 kg 0.8 kg 5.0 kg

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

The speed of light can be used to measure the

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.