Homework Help: physics

Posted by savy on Friday, October 7, 2011 at 12:44am.

A freight train has a mass of 1.4 107 kg. If the locomotive can exert a constant pull of 8.1 105 N, how long does it take to increase the speed of the train from rest to 66 km/h?

physics - Henry, Saturday, October 8, 2011 at 2:54pm
F = = ma,
a = F/m = 8.1*10^5 / 1.4*10^7 = 0.058m/s^2.

Vf = 66km/h * 1000m/km * (1/3600)h/s =
18.33m/s.

t = (Vf - Vo) / a,
t = (18.33 - 0) / 0.058 = 316s.

Answer this Question

Related Questions

Physics - A freight train has a mass of 1.7 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 1.5 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 1.2 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 1.9 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 6.5 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 5 x 107 kg. If the locomotive can exert ...
physics - A freight train has a mass of 3.1 × 107 kg. If the locomotive ...
physics - A freight train has a mass of 1.5 × 107 kg. If the locomotive ...
physics - A freight train has a mass of 3.2 × 107 kg. If the locomotive ...
Physics - A freight train has a mass of 1.2 × 107 kg. If the locomotive ...

For Further Reading

First Name:
School Subject:
Answer: