Physics Past Questions and Answers

A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied

A metal of mass 200g at a temperature of 100<sup style='font-size: smaller;'>o</sup>C is placed in 100g of water at 25<sup style='font-size: smaller;'>o</sup>C in a container of negligible heat capacity. If the final steady temperature is 30<sup style='font-size: smaller;'>o</sup>C, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg<sup style='font-size: smaller;'>-1</sup> K<sup style='font-size: smaller;'>-1</sup>]

Ether produces a cooling effect when it is poured on the hand because it has

Which of the following statements about the image formed by a plane mirror is not correct?

The image formed by a convex mirror is always