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A metal bal of mass 1 kg is heated by me...

A metal bal of mass 1 kg is heated by means of a 20 W heater in a room at `20^(@)C`. The temperature of the ball becomes steady at `50^(@)C`. Assume newton's law of cooling to hold good in the given situation. The temperature of the bal rises uniformly from `20^(@)C` to `30^(@)C` in 5 minutes. select the correct alternatives
(1) The rate of heat loss by ball to surrounding is 20 W, when it is at `50^(@)`
(2) Ther ate of heat loss by ball to surrounding is `(20)/(3)W`, when it is at `30^(@)C`
(3) The rate of heat loss by ball to surrounding 20 W, when it is at `30^(@)C`
(4). The specific heat capacity of the gas is 500 J/kg K.

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The correct Answer is:
1,2,4
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