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B. Chemical reactions must overcome the strong nuclear force
Answer: 4.8 s
Explanation:
We have the following data:
the mass of the raft
the force applied by Sawyer
the raft's final speed
the raft's initial speed (assuming it starts from rest)
We have to find the time 
Well, according to Newton's second law of motion we have:
(1)
Where 
is the acceleration, which can be expressed as:
(2)
Substituting (2) in (1):
(3)
Where 
Isolating from (3):
(4)
Finally:
Velocity is d/t distance over time. Increase velocity (speed) decrease. Increase d velocity increases.
Answer:
502000W/m²
Heat flux = 800×50.2/20 =
502000W/m²
Explanation:
