Question Text
Question 2 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.
Question 6 :
Six electric appliances of 100 watts each are used for 6 hours. The electrical energy consumed is:
Question 9 :
An engine develops 10 kW of power. How much time will it take to lift a mass of 200kg to a height of 40m (g = 10 $ms^{-2}$)?
Question 11 :
Which of the following must be known in order to determine the power output of an automobile? <br>
Question 12 :
A machine gun fires $240$ bullets $per\ minute$ with a certain velocity. If the mass of each bullet is $10 gm$ and the power of the gun is $7.2 kW$, the velocity with which each bullet is fired must be:
Question 13 :
A house uses 7 tubelight of 50 W each for 5 hours a day. The electrical energy consumption for one day is:
Question 15 :
A car of mass $2,000 kg$ is lifted up a distance of $30 m$ by a crane in $1\ minute$. A second crane does the same job in $2\ minutes$. The power supplied by second crane is: