Thursday

September 18, 2014

September 18, 2014

Posted by **monica** on Wednesday, January 5, 2011 at 6:43pm.

7

kg.

If the locomotive can exert a constant pull

of 6.2×10

5

N, how long does it take to increase

the speed of the train from rest to 70 km/h?

Answer in units of min.

- physics! -
**Damon**, Wednesday, January 5, 2011 at 6:48pmF = m a

6.2 * 10^5 = 1.8 * 10^7 a

a = (6.2/1.8)10^-2 m/s^2

v = a t

now what is v

70,000 m/3600 s = 19.4 m/s

so

t = (19.4 * 1.8 /6.2 )* 10^2 seconds

**Answer this Question**

**Related Questions**

physics - A freight train has a mass of 1.5 x 10^7 kg . If the locomotive can ...

Physics - A freight train has a mass of 1.0 10^7 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 1.7 107 kg. If the locomotive can exert ...

physics - A freight train has a mass of 1.4 107 kg. If the locomotive can exert...

physics - A freight train has a mass of 1.6 × 10 7 kg. If the locomotive can ...

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 6.5 107 kg. If the locomotive can exert ...

physics - A freight train has a mass of 2.1 × 10^7 kg. If the locomotive can ...

physics - A freight train has a mass of 5 x 107 kg. If the locomotive can exert ...