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प्रश्न
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उत्तर
Given force F = 300 N, u = 18 km/hr
Now, power = `"W"/"t" = "F.s"/"t"` = F.v
or P = 300 x `(18 xx 10³)/(60 xx 60)` = 1500 watt
Now 1 H>P = 746 watt
1500 watt = 2 H>P (approx)
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संबंधित प्रश्न
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
State the energy changes which take place when A toy car with a wound spring moves on ground.
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
