4J
15J
5J
100J
Correct answer is D
W = FS = 20 X 5
= 100J
1200g
1000g
800g
400g
Correct answer is C
Mass = density x volume
400 x 2.5 = 1000g
Loss in mass = volume x density
= \(\frac{400}{2}\) x 1 = 200g
Reading on spring balance = 1000 - 200g = 800g
Which of the following substances lowers the surface tension of water?
metal
sand
detergent
paper
Correct answer is C
No explanation has been provided for this answer.
i only
i and ii only
ii and iii only
i, ii and iii
Correct answer is B
Terminal velocity refers to the constant speed that an object reaches as it falls through a liquid or gas.
Since the net force on the object is zero, the object has zero acceleration.
elastic limit
breaking point
yield point
proportional limit
Correct answer is B
No explanation has been provided for this answer.
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