The steel bed of a suspension bridge is 200 m long at 30oC. If the extreme temperatures to which it might be exposed are -50oC and 40oC. How much will it contract and expand?

Inertia, Acceleration, and Reaction.

Explanation:

Good Day...

Problem:

What is the acceleration in m/s^2 of a car changes speed from 20km/he to 50 km/he in 4 s?

Note: we need to convert first the given velocity to m/s

1000 m = 1 km

3600 s  = 1 hr

Converting km/hr to m/s :

20 km/hr × 1000 m / 1 km × 1 hr / 3600 s = 5.56 m/s

50 km/hr × 1000 m / 1 km × 1 hr / 3600 s =  13.89 m/s

Given Data:

a (acceleration) = ? unknown

Vi (initial velocity) = 20 Km / hr (5.56 m/s)

Vf (final velocity) = 50 km/hr (13.89 m/s)

t (time)                 = 4 s

Solution:

the formula of acceleration is acceleration = (Vf-Vi) / t

acceleration = (Vf-Vi) / t

                     = ( 13.89 m/s - 5.56 m/s) / 4 s

                     = 8.33 m/s / 4 s

                     = 2.08 m/s^2

acceleration = 2.08 m/s^2

Hope it helps=)

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Hope this helps!

Thanks!

-Charlie