Answer:
B
Explanation:
Friction always eventually stops whatever is in motion.
If something is going down a hill it can help slow it down
it can stop you from flying off a rollercoaster
I think it's longitudinal wave because the particles move parallel to the direction that the wave is traveling.
BMI is a measure of body fat determined by ones Height, Weight, and Gender.
Answer:
581 kJ, work was done by the system
Explanation:
According to the first law of thermodynamics:

where
is the change in internal energy of the system
Q is the heat absorbed by the system (positive if absorbed, negative if released)
W is the work done by the system (positive if done by the system, negative if done by the surrounding)
In this problem,


Therefore the work done by the system is

And the positive sign means the work is done BY the system.