A piece of pipe has an outer radius of 4.5 cm,
an inner radius of 2.5 cm, and length of 39 cm
as shown in the figure.
39 cm
4.5 cm
K
2.5 cm
What is the mass of this pipe? Assume its
density is 8.7 g/cm3
Answer in units of kg.

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

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