Advertisements
Advertisements
प्रश्न
A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
Advertisements
उत्तर
Given: mass = 50kg
Total height traveled = 60 × 20 cm
= 1200 cm
= 12m
g = 10 ms−2
time taken = 5 min
= 5 × 60 s
= 300 s
Work done = mgh
= 50 × 10 × 12
= 6000J
Power = `"work done"/"time taken"`
= `6000/300`
= 20 watt
APPEARS IN
संबंधित प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
