Advertisements
Advertisements
प्रश्न
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
Advertisements
उत्तर
(i) Mechanical Advantage (M.A.) = `"l"/"h"`
M.A. =`7.5/2.5=3`
(ii) M.A. =`("Load"("L"))/("Effort"("E"))`
3 = `(1,500)/"E"`
E = 500 N.
(iii) More effort is required becaues of friction.
APPEARS IN
संबंधित प्रश्न
Work is said to be done by a forte only when ................
What are the two kinds of mechanical energy?
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
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.
Is power a scalar quantity?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
What is the difference between renewable and non-renewable resources?
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
