Question Text
Question 5 :
Assertion: Kilowatt Hour is the unit of electric power
Reason: KWH is a commercial unit used for expressing consumed electrical energy.
Question 6 :
What does the slope of work-time curve at any instant represent?
Question 7 :
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 first crane is:
Question 8 :
A man weighing 600 N carries a load of 150 N up the stairs 6 m high in 15 seconds. His power will be:
Question 9 :
If the force applied is $F$ and the velocity gained is $v$, then the power developed is:
Question 10 :
Six electric appliances of 100 watts each are used for 6 hours. The electrical energy consumed is:
Question 11 :
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 12 :
A man can lift a block of mass of 50 kg up to a height of 2 m in 2 seconds. Calculate the power developed by the man to lift the block.
Question 13 :
Which of the following must be known in order to determine the power output of an automobile? <br>