1 watt is defined as:
Power of an agent, which does work at the rate of 1 joule/second
Power of an agent, which does work at the rate of 1 joule-second
1 joule of work done in an hour
All of these
If power is increased by 50 % and work done is constant, then the time taken is reduced by:
In a hydroelectric power plant, waterfalls at a rate of 1000 kg/s from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second.(take g=9.8 ms−2)
In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is
If the work done on a body at two instances i.e., at 20 s and 40 s is same, then what is the ratio of the power?
The work done by the heart to beat one time is 1.2 J. If it beats 72 times in 1 minute, calculate the power of heart.
A car accelerates from rest to speed of 100 m/s in 10 seconds. If the mass of the car is 50 kg, then power developed by the engine is:
The rate of doing work or rate at which energy is transferred is known as:
An electric bulb of rating 50 W is used for 8 hours in one day. Find the number of units of energy used by the electric bulb.
A skydiver weighing 60 kg moves through a distance of 40 m upwards in 2 seconds. The power spent by the skydiver due to its weight (in Watt) is