Home
Class 11
PHYSICS
A car of mass m has an engine which can ...

A car of mass m has an engine which can deliver power P. The minimum time in which car can be accelerated from rest to a speed v is :-

A

`Pmv^(2)`

B

`(mv^(2))/(2P)`

C

`2Pmv^(2)`

D

`mv^(2)P`

Text Solution

Verified by Experts

The correct Answer is:
B
Power = Force `xx` Velocity
In this case, the required force
= weight of the lift + frictional force `= mg + F`
`=1800xx10+4000=22000 N`
`therefore` Power `= Fv = 22000 xx 2=44000` watt
`therefore P = 44 kW`
Promotional Banner

Topper's Solved these Questions

  • FORCE, WORK AND TORQUE

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • FRICTIONAL IN SOLIDS AND LIQUIDS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

Similar Questions

Explore conceptually related problems

A car of mass mhasan engine which can deliver constant power P.the maximum speed that the car can attain in t seconds in

On a horizontal rought rood , value of coefficient of friction mu =0.4 .Find the minimum time in which a distance of 400m can be covered. The car start from rest and finally comes to rest.

A car starts from rest to cover a distance s. the coefficient of friction between the road and the tyres is mu . The minimum time in which the car can cover the distance is proportional to

A railroad flatcar of mass M can roll without friction along a straight horizontal track. Initially, a man of mass 'm' is standing on the car, which is at rest. What is the velocity of the car if man runs to the left so that his speed relative to the car is v_(rel) .

A car of mass m is initially at rest on the boat of mass M tied to the wall of dock through a massless, inextensible string. The car accelerates from rest to velocity v_(0) in times to. At t = t_(0) the car applies brake and comes to rest relative to the boat in negligible time. Neglect friction between the boat and water: the time 't' at which boat will strike the wall is

A car starts from rest. It has to cover a distane of 500m from rest to rest. The coefficient of friction between the road and the tyre is 1/2. the minimum time in which the car can cover this distance is? (g=10m//s^(2))

If the crest of the hill has a radius of curvature p determine the maximum constnat speed at which the car can travel over it without leaving the surface of the road. Neglect the size of the car in the calculation. The car has mass m. Given p=40m, m=1700kg, g=10m//s^(2)