1. A cord is used to ower vertically a block of mas M a distance d at a constant
ID: 1776135 • Letter: 1
Question
1. A cord is used to ower vertically a block of mas M a distance d at a constant downward ve acceleration of. Calculate the work done by the cord on the e Mg KWis 2. There is a 12 story building. Each story is 3 m high. A motor pump of power 1 fitted at the ground. The cross-sectional area of the pipe is 5em2. Upto which story will water reach? 3. Every minute, 1012g mass of sun is being converted to energy per minute. What is the power of the sun in (a) Kilowatts (KW) (b) Horsepower (hp) 4. Determine the work a hiker must do on a 15.0 kg backpack to carry it up a hill of height h-10 m, as shown in Figure. Determine also the work done by the gravity on the backpack and the net work done on the backpack.Explanation / Answer
1) Let the tension in the string is T
Using Second law of motion
Mg - T = Mg/4
T = 0.75*Mg
work done by the cord on the block = - T * d
work done by the cord on the block = - 0.75 M*g*d
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