omtadp:… Search A freight train has a mass of 1.5 x 10 kg. If the locomotive can

Question

omtadp:… Search A freight train has a mass of 1.5 x 10 kg. If the locomotive can exert a constant pul of 7.6 x 10% N, how long does it take to increase the speed of the train from rest to 72 kmvh? O Show My Work oli Ashopper a supermarket pushes a loaded cart with a honzontal force of 10 N. The cart has a mass of 34 kg. (a) How far will it move in 7.0 s, starting from rest? (ignore friction.) (b) How far will t move in 7.0 s if the shopper places his 30 N child in the cart before he begins to push it? Need Help? ReadTalk to a Tutor Show My Work Konon

Explanation / Answer

4) vi = 0

vf = 72 km/hr = 72*1000/3600 = 20 m/s

F = 7.6*10^5 N

acceleration = f/m = 7.6*10^5/1.5*10^7 = 0.051 m/s^2

a = vf-vi/t

t = 20/0.051 = 392 sec = 6.53 min

5) a = 10/34 = 0.294 m/s^2

x = vi*t+1/2at^2 = 1/2*0.294*7^2 = 7.203 m

b) m2 = 34+30/9.8 = 37.1 kg

a = 10/37.1 = 0.27 m/s^2

x = 1/2*0.27*7^2 = 6.6 m

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