Calculate the Work done ; If work done is zero , give reasons.
a)A man carrying a load of 5kg on his head and moving forward with a velocity 5m/s
b)A child of mass 35kg riding a bicycle with velocity 36 km/hr
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Hello deepu,
a.) Here in this situation the force exerted in perpendicular to the direction of displacement due to which work done is zero as cos 90 degrees= 0.
b.)Given,
Mass of child = 35kg
velocity= 36km/hr
=10 m/s
work done here is in the form of kinetic energy.
Therfore work done = 1/2 mv^2
=1/2 x 35 x (10)^2
=1/2 x 35 x 100
=35 x 50
=1750 Joules.
hope it helps u.........
a.) Here in this situation the force exerted in perpendicular to the direction of displacement due to which work done is zero as cos 90 degrees= 0.
b.)Given,
Mass of child = 35kg
velocity= 36km/hr
=10 m/s
work done here is in the form of kinetic energy.
Therfore work done = 1/2 mv^2
=1/2 x 35 x (10)^2
=1/2 x 35 x 100
=35 x 50
=1750 Joules.
hope it helps u.........
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