The branch of physics that deals with the study of force energy and motion is classic mechanics
It depends most on the temperature of the gas.
Answer:
The forces that do non-zero work on the block are gravity and normal reaction force
Explanation:
Power = 
Delilah: 170J/30s = 5.66 W
Adam: 260J/20s = 13 W
The answer of question 1 is:
C. The gravitational force becomes 16 times less.
The answer of question 2 is:
A. The gravitational force is 12 times larger.
The answer of question 3 is :
A. The new gravitational force is 9 times stronger than the old one.
The answer of question 4 is:
D. 8 times more.