The loaded coal car is used to raise the empty coal car up an incline (200m high

ID: 2109649 • Letter: T

Question

The loaded coal car is used to raise the empty coal car up

incline (200m high) as shown below. assume the coal car is

loaded

with 100 metric tons of coal. A hydraulic braking system

(shown

below) is used to control the speed of the coal cars. the

large

brake cylinder piston has a diameter of 200cm. The small

master

cylinder piston operated by the brakeman has a diameter of

5cm.

The

coefficient of fricton between the shoe and the whell drum

0.49.

a) Ã‚ How much braking force is

required on the

brake

shoe to keep the coal cars at a constant velocity of 2.5

m/s?

b) How much force is required to be applied by the brake man

onto the pedal to keep the coal cars at a constant velocity?

c) How much pressure does the brake line experience while

the

braking force is applied? ( in MPa and in lbs / in^2 )

coal car facts- depth = 4m, width = 4m, length =

10m,

tare weight = 58,800 N

www.uprr.com/.../service/2009/0520_200000-coal.shtml -

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