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##### 4. A body of mass 1 \mathrm{~kg} is lifted through a height of 1 \mathrm{~m} . The energy possessed in the body will be (consider g=10 \mathrm{~ms}^{-2} )a) 1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule

b) The energy of 600 \mathrm{~J} dissipated by a bulb in 50 minutes. Find the power of the bulb.

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4. A body of mass 1 \mathrm{~kg} is lifted through a height of 1 \mathrm{~m} . The energy possessed in the body will be (consider g=10 \mathrm{~ms}^{-2} )a) 1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule

10. Write notes on Tidal energy and Geothermal energy.

9.6 Why transfer of heat in fluids takes place by convection?

9.2 Why metals are good conductors of heat?

9.3 Explain why:(a) a metal feels colder to touch than wood kept in a cold place?