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An engine can pull 4 coaches at a maximum speed of 20m/s. mass of enngine is twice that of every coach. assume resistive forces to be proportional to the weight. calculate maximum speeds of engines when it pulls 12 and 6 coaches respectively.

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Q. An engine can pull 4 coaches at a maximum speed of 20 m/s. Mass of the engine is twice the mass of every coach. Assuming resistive forces proportional to the weight, approximate maximum speeds of the engine when it pulls 12 and 6 coaches are

Q. An engine can pull four coaches at a maximum speed of

20 m s^{- 1}

. The mass of the engine is twice the mass of every coach. Assuming resistive forces to be proportional to the weight, approximate maximum speeds of the engine, when it pulls

12

6

Q. An engine of mass

5 \times 10^{4} k g

pulls a coach of mass

4 \times 10^{4} k g

. A resistance of

1 N

100 k g

is acting on both the coach and the engine and if the driving force of the engine is

4500 N

then the acceleration of the engine and the tension in the coupling will respectively be_________

Q. A train has 5 coaches attached to an engine. 180 seats are available in all the coaches.

There are 30 seats in the

1^{s t}

coach. The number of seats in the

2^{n d}

coach is twice the number of seats in the

1^{s t}

coach. The ratio of the number of seats in the

3^{r d}

4^{t h}

5^{t h}

coaches is 2:3:4.

Find the minimum number of seats in a coach.

Q. Each of the following statement describes a force acting. Which force is causing work to be done?

(a) the weight of a book at rest on a table
(b) the pull of a moving railway engine on its coaches
(b) the tension in an elastic band wrapped around a parcel
(d) the push of a person's feet when standing on the floor

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