[4 marks] 22. Compare and contrast the structure and roles of tendons and ligaments.
1 answer:
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Answer:
a) Instantaneous rate at which the force does work on the object = -6 W
b)
Explanation:
a) Given that
and
Instantaneous rate at which the force does work on the object is called power.
Power is the dot product of force and velocity.
Instantaneous rate at which the force does work on the object = -6 W
b) Here given that
Power = -12 W
Answer:
At 11.5 m
Explanation:
The power per unit area corresponds to the intensity, which is given by
where
P is the power
is the area irradiated at a distance r from the source (it corresponds to the surface area of a sphere of radius r)
Here we want the intensity of the two light bulbs to be the same, so
where we have
P1 = 100 W is the power of the first light bulb
P2 = 75 W is the power of the second light bulb
r2 = 10 m is the distance from the second light bulb
Solving for r1, we find