Advertisements
Advertisements
प्रश्न
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
Advertisements
उत्तर
Force = weight of body = 350 N
Total distance = h = 30 × 20 = 600 cm
h = `600/100 = 6m`
(i) Work done W = F × h
W = 350 × 6 = 2100 J
(ii) Power spent = `"Work done"/"Time taken" = (30 × "Mg" × "h")/(1 " minute")`
= `((30 × 350 ×20)/100)/(1 " minute")`
= `(2100 J)/(1 " minute")`
= `(2100 J)/(60 " Sec")`
Power spent = 35
APPEARS IN
संबंधित प्रश्न
Draw a simplified diagram of a lemon crusher, indicting of load and effort
Differentiate between work and power.
Name the quality which is measured in eV
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
State the factors on which moment of force about a point depends.
State the principle of moments.
Name the force needed for circular motion. What is the direction of the force?
How is 1 kgf related to the SI unit of force?
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
