<span>BSL Physics Glossary - air resistance - definition. Translation: Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.</span><span>
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Answer:
Creation of energy by joining the nuclei of two hydrogen atoms to form helium
Answer: D
Explanation:
A -amount of work
F-force
s-distance
If you keep same Force(F) and increase distance(s), amount of work will increase, according to:
A=F*s
Answer:
Her angular momentum does not change.
Explanation:
Conservation of angular momentum: It states that there is no change in the angular momentum when no torque outside the system is applied to the body.
In the given problem, an ice skater spins her arm outstretched. She pulls her arms in towards her body.
The angular momentum of an ice skaters remains same as the there is no external torque applied on an ice skater. The initial angular momentum and the final angular momentum of the given system are same. Therefore, the angular momentum is conserved.
Therefore, her angular momentum does not change.
Answer:
The work done on the jet is 
Given:
Force, F = 
Distance moved by the jet, x = 87 m
Kinetic Energy, KE = 
Solution:
Now, to calculate the work done on the fire fighter jet by the catapult, we find the difference between the KE of the jet at lift off and the work done by the engines.
This difference provides the amount of work done on the jet and is given by:
(1)
Now, the work done by the engines is given by:
Now, using eqn (1):
