Question
A light-rail commuter train draws 630 A of 650-V DC electricity when accelerating. (a) What is its power consumption rate in kilowatts? (b) How long does it take to reach 20.0 m/s starting from rest if its loaded mass is $5.30 \times 10^4 \textrm{ kg}$ , assuming 95.0% efficiency and constant power? (c) Find its average acceleration. (d) Discuss how the acceleration you found for the light-rail train compares to what might be typical for an automobile.
1. $4.1 \times 10^5 \textrm{ W}$
2. $27 \textrm{ s}$
3. $0.73 \textrm{m/s}^2$
4. $2.8 \textrm{m/s}^2$. The car accelerates faster.
Solution Video