Home
Class 12
PHYSICS
An engine is pulling a train of mass m o...

An engine is pulling a train of mass `m` on a level track at a uniform speed `u`. The resistive froce offered per unit mass is `f`.

A

power produced by the engine is mfy

B

the extra power developed by the engine to maintain a speed v up a gradient of h in s is `(mghv)/(v)`

C

the frictional force exxerting on the train is mf on the level track

D

non of above

Text Solution

Verified by Experts

The correct Answer is:
D
Total resistive force=mf `rArr` power =fv=mfv
Extra power required= `(mg sin theta)v=(mghv)/(s)`
Promotional Banner

Topper's Solved these Questions

  • TEST PAPERS

    ALLEN|Exercise PAPER 2|60 Videos

  • TEST PAPERS

    ALLEN|Exercise PAPER 3|99 Videos

  • TEST PAPER 4

    ALLEN|Exercise PHYSICS|44 Videos

  • UNIT & DIMENSIONS, BASIC MATHS AND VECTOR

    ALLEN|Exercise Exercise (J-A)|7 Videos

Similar Questions

Explore conceptually related problems

A railway engine of mass 50 tons is pulling a wagon of mass 40 tons with a force of 4500N. The resistance force acting is 1N per ton. The tension in the coupling between the engine and the wagon is

A train of weight 10^(7)N is running on a travel track with uniform speed of 36 km h^(-1) . The frictional force is 0.5 kg f per quintal. If g = 10 ms^(-2) , power of engine is

Find the force required to pull a block of mass 100kg up an incline of 8^(@) at a uniform speed of 5m//s . The coefficient of friction between the block and the plane is 0.3 .

Two trains P and Q are moving along parllel tracks same uniform speed of 20 m s^(-1) . The driver of train P decides to overtake train Q and accelerate his frain by 1 ms^(-2) , After 50 s , train P crosses the engine of train Q . Find out what was the distance between the two trains initially. provided the length each is 400 m .

When a bullet of mass 10 g and speed 100 m/s penetrates up to distance 1 cm in a human body at rest. The resistance offered by human body is :

An engine of power 58.8 k W pulls a train of mass 2xx10^(5)kg with a velocity of 36 kmh^(-1) . The coefficient of kinetic friction is

A car is moving in a horizontal level of circular track with uniform speed of 10 m/s . If radius of circular path is 50 m then the minimum coefficient of friction to avoid over turning is

A train of mass M is moving on a circular track of radius R with constant speed v . The length of the train is half of the perimeter of the track. The linear momentum of the train will be

A train of mass M is moving on a circular track of radius R with constant speed v . The length of the train is half of the perimeter of the track. The linear momentum of the train will be

A 8000kg engine pulls a train of 5 wagons , each of 2000kg , along a horizontal track. If the engine exerts a force of 40000N and the track offers a frictional force of 5000N , then calculate: (a) the net accelerating force, (b) the acceleration of the train, and (c ) the force of wagon 1 on wagon 2.