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secondary 4 | E Maths
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Another physics questions. Is the answer D?
Date Posted: 4 years ago
Views: 260
I think its D
nope, the ans is not D.
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Ans is B
Use equation E=Pt
For the same amount of energy, a longer time will need lesser power
You can also eliminate the other choice
A, and C are wrong because GPE=mgh. A greater mass or height will incur a greater energy thus a greater power is required
D is wrong because there is no variables changed. Even if you use a motor, E and t remained unchanged. Thus P remains the same as if u pull it up urself.
Use equation E=Pt
For the same amount of energy, a longer time will need lesser power
You can also eliminate the other choice
A, and C are wrong because GPE=mgh. A greater mass or height will incur a greater energy thus a greater power is required
D is wrong because there is no variables changed. Even if you use a motor, E and t remained unchanged. Thus P remains the same as if u pull it up urself.
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