The world-famous Hangzhou Bay sea crossing bridge is 36 km long, with a design speed of 100 km / h. Q: the vehicle mass is 5 x 103 kg, and the design speed is uniform on the bridge Hangzhou Bay sea crossing bridge is 36 km long and the design speed is 100 km / h Q: the mass of the car is 5x103kg. When driving at the designed speed on the bridge, the resistance is 0.06 times of the weight of the car. Calculate the power of the car's engine. (G is 10N / kg)

The world-famous Hangzhou Bay sea crossing bridge is 36 km long, with a design speed of 100 km / h. Q: the vehicle mass is 5 x 103 kg, and the design speed is uniform on the bridge Hangzhou Bay sea crossing bridge is 36 km long and the design speed is 100 km / h Q: the mass of the car is 5x103kg. When driving at the designed speed on the bridge, the resistance is 0.06 times of the weight of the car. Calculate the power of the car's engine. (G is 10N / kg)

P=f*v=0.06mg*v=0.06*5x10^3x10x10^5/3600=
Power is resistance times speed
Speed in meters per second

The Hangzhou Bay Bridge is 36 kilometers long. Dad and Uncle Li drive from both ends of the bridge at the same time, facing each other and meeting at 12
It is known that Dad's speed is 80 km / h. can you calculate Uncle Li's average driving speed?

Let Uncle Li drive at an average speed of X km / h
80*1/5+1/5x=36
The solution is as follows
x=100
So Uncle Li drives at an average speed of 100 km / h

It took four hours for the car to travel from city a to city B. the first hour was 50 km, then it stopped for one hour, and then it drove for another 70 km in the next two hours Ask for Solution: Answer: 】

1. Known: driving 50km in the first hour: average speed in the first hour v = s / T = 50km / 1H = 50km / h
2. It is known that the average speed v = s / T = 0km / 1H = 0km / h in the second hour after stopping for one hour
3. It is known that it has driven 70km in the last two hours. Calculate the average speed in the last two hours v = s / T = 70km / 2H = 35km / h
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