Two objects, object X and Object Y, are held together by a light string
1 answer:
Answer:
This question is incomplete
Explanation:
The completed question is in the attachment to this question
The two objects (X and Y) at rest had a potential energy of Mx.gH and My.gH respectively because the formula for potential energy (P.E) is mgh. Where m is the mass of the object, g is acceleration due to gravity and h is the height of the object above the ground. Hence, Mx and My are the masses of X and Y respectively.
The change in there potential energy to kinetic energy and back to there potential energy will be
P.E of Y - P.E of X (because mass of Y is larger and will hit the floor first)
Hence, My.gH - Mx.gH ⇔ (My - Mx)gH
Correct option is C
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Answer:
<h2>3</h2>Explanation:
Using the efficiency formula. Efficiency = MA/VR * 100%
MA = Mechanical Advantage
VR = velocity ratio =
Distance moved by effort = 4.5m
distance moved by load = 1.5m
VR = 4.5/1.5 =3
Assuming efficiency is 100% (since friction can be ignored)
100% = MA/3 * 100%
1 = MA/3
MA = 3*1
MA = 3
Mechanical Advantage of the ramp is 3