A 93kg skier goes down a hill at a velocity of 10m/s. What is the momentum of the skier? 9.3 kgm/s
93 kgm/s
930 kgm/s
10 kgm/s

As shown in fig. p3.64, a closed, rigid tank fitted with a fine-wire electric resistor is filled with refrigerant 22, initially at 2108c, a quality of 80%, and a volume of 0.01 m3. a 12-volt battery provides a 5-amp current to the resistor for 5 minutes. if the final temperature of the refrigerant is 408c, determine the heat transfer, in kj, from the refrigerant.

It is really hard for me right know

Which is an advantage of subdividing science into different areas?