# Physics

A train on a mountain railway is carrying 200 people of average mass 70kg up a slope at an angle of 30° to the horizontal and at a speed of 6.0 m s–1. The train itself has a mass of 80 000 kg. The percentage of the power from the engine which is used to raise the passengers and the train is 40%.
What is the power of the engine?

1. 👍 0
2. 👎 0
3. 👁 457
1. Power=Mg(speed)*sin(θ)/0.40 watts
M=total mass (passengers, train, etc.)

1. 👍 0
2. 👎 0
posted by MathMate
2. mass of passengers=200*70=14000...total mass of train +passengers=80000+14000... their weight =94000*9.81=922140..now force = mgsin30= 922140sin30=461070.. power =force*velocity= 461070*6=2766420..this is power output.. now we know that power output divide by power input *100%=40%..solve it to get the answer 6.9MW...

1. 👍 2
2. 👎 0

## Similar Questions

1. ### physics

A locomotive that has a mass of 6.4 x 105 kg is used to pull 2 railway cars. Railway car 1 has a mass of 5.0 x 105 kg, is attached to railway car to that has a mass of 3.6 x 105 kg by a locking mechanism. A railway engineer tests

asked by Anthony on October 30, 2013

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the

asked by Jess J on April 25, 2011

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the

asked by Jess J on April 25, 2011

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the

asked by Jess J on April 20, 2011
5. ### Physics

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the

asked by Jess J on April 20, 2011
1. ### physics 11

The engine of a train has a mass of 5.0 x 10^4kg. It can accelaerate six railway cars having a total mass of 3.0 x 10^5 at 0.40 m/s squared [fwd]. What acceleration can it give four railway cars having a total mass of 2.0 x

asked by needs help on October 17, 2009
2. ### physics

The electric motor of a model train accelerates the train from rest to 0.755 m/s in 19.5 ms. The total mass of the train is 875 g. Find the average power delivered to the train during the acceleration.

asked by Emily Tran on November 18, 2012
3. ### physics

The electric motor of a model train accelerates the train from rest to 0.640 m/s in 19.0 ms. The total mass of the train is 875 g. Find the average power delivered to the train during its acceleration.

asked by kk on October 27, 2010
4. ### Physics

The electric motor of a model train accelerates the train from rest to 0.580 m/s in 33.0 ms. The total mass of the train is 565 g. Find the average power delivered to the train during its acceleration.

asked by Anonymous on September 27, 2011
5. ### College Physics

The electric motor of a model train accelerates the train from rest to 0.660 m/s in 31.0 ms. The total mass of the train is 650 g. Find the average power delivered to the train during its acceleration.

asked by Anonymous on November 7, 2012

More Similar Questions