Question
13. Pour qu'une voiture accélère sur une distance de 112 m en 8,23 s, son moteur doit exercer une force de 4250 N. Calcule la puissance du moteur, en watts et en kilowatts.
Solution
4.2
(178 Votes)
Adrian
Professional · Tutor for 6 years
Answer
Here's how to calculate the power of the engine:1. **Calculate the work done:**Work (W) is equal to force (F) multiplied by distance (d).* W = F * d* W = 4250 N * 112 m* W = 476,000 J (Joules)2. **Calculate the power:**Power (P) is equal to work (W) divided by time (t).* P = W / t* P = 476,000 J / 8.23 s* P = 57,837.18 W (Watts)3. **Convert watts to kilowatts:**One kilowatt (kW) is equal to 1000 watts.* P = 57,837.18 W / 1000 W/kW* P = 57.84 kW (kilowatts)**Therefore, the power of the engine is 57,837.18 watts or 57.84 kilowatts.**