Advertisements
Advertisements
प्रश्न
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
Advertisements
उत्तर
The centripetal force, which generates the force of gravity, does no work. The satellites have accomplished nothing at all. This is due to the fact that the Earth is the satellite's centre of mass and that the displacement is always along the tangent to the circular route, or normal to the direction of force on the satellite. (θ = 90°)
Displacement of satellite is normal to the direction of force
where, O - Earth, S - Displacement, F - Force of gravity
W = F × S cos 90°
W = F × S × 0 = 0
APPEARS IN
संबंधित प्रश्न
Draw a simplified diagram of a lemon crusher, indicting of load and effort
Is it possible that no transfer of energy may take place even when a force is applied to a body?
A man spends 7.4 kJ energy in displacing a body by 74 m in the direction in which he applies force, in 2.5 s. Calculate the power spent (in H.P) by the man.
How is 1 kgf related to the SI unit of force?
Give the units of couple.
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
Relate 1 KWh (kilowatt hour) with joule.
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
