Question

A mass of 35 kg is dropped from a height of 10 cm find its(i) velocity and (II) kinetic energy is it just reach the ground .take g= 9.8 m /sec.

Answer 1

an object of mass 5 kg is dropped from a height of 10 m . find its kinetic energy when it is half-way down .
find the energy in kWh consumed in the month of april by 4 devicesof power 100W each if each one of them is used for 10 hrs a day .
how many joules make 1kwof power in 1s ?
give the energy transformation taking place in a musical toy car when u wind it and it moves .
OR
1. At the mid way half of the P.E will be converted into K.E of the body.

P.E = mgh

K.E at the mid way = P.E/2 = mgh/2 = 245 J

2. Total power of the 4 devises = 4x100 = 400 W

Total hours = 30x10 = 300

Total energy = 400x300 W-h = 120 kWh

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