At railroad crossings, cars stop for trains (and not vice versa) because... Trai

Question

At railroad crossings, cars stop for trains (and not vice versa) because... Trains have more momentum Trains have more torque Cars have more momentum Cars have more torque During inelastic collisions, conserved Energy and Momentum are Energy, but not momentum is Neither energy nor momentum are Momentum, but not energy is Niagara Falls is about 57 m high. How long could you run your flat-screen TV (power rating = 40 Watts) from the energy generated by 1.0 kg of water that fell this way? 0.14 sec 1.4 sec 14 sec 140 sec

Explanation / Answer

8.

Answer is a) Trains have more momentum.

Since momentum P=mV

,since mass of train is more compared to car .

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9.

Answer is D)Momentum but not energy is

Since In inelastic collision Energy is not conserved due to action of internal friction but obey conservation of momentum .

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Potential energy is

E=mgh =1*9.8*57

E=558.6 J

Since Power

P=E/t

=>t=E/P =558.6/40

t=13.97 =14 sec (approx)

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