Question

weight lifter of power 1960 watt lifts a load of mass M from ground to a height of 2m in 3 sec M is .....​

Answer 1

Answer:

Explanation:

POWER ,P = 1960 WATT

HEIGHT , H = 2 M

TIME TAKEN , T = 3 SEC

MASS , M = ?

POWER = WORK DONE / TIME TAKEN

HERE WORK DONE = CHANGE IN POTENTIAL ENERGY AS THERE IS A CHANGE IN POSITION

WORK DONE = M * g * H

                       = M*9.8*2

                       = M*19.6

1960= 19.6*M/3

1960*3=19.6*M

M = 1960*3/19.6

M = 19600*3/196

M = 300 G.

MASS OF THE BLOCK = 300 G

                                      = 0.3 KG.

HOPE THIS HELPS.

Answer 2

Answer:

3000 kg

Explanation:

force applied against gravity = M*g= 9.8M

work done = Force × Distance = 9.8M*2 =19.6M

Power = Work/time = 19.6M/30

so, 1960 = 19.6M/30

M = 3000 kg

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