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bonufazy [111]
3 years ago
13

Please help!!!! 15 points!!!

Physics
1 answer:
Ratling [72]3 years ago
3 0
A car slamming on brakes is newtons law s of physics friction is what the energy a lite light buld  is electrical energy traveling back and forth solar panels is to conserve and store energy 
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Fission is used to make the low cost energy

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4 years ago
If the diameter of each of a car's wheels is 0.4 meters, approximately, what was the average speed of the car for its three-hour
Reptile [31]

Answer:

42 km/h was the average speed of the car for its three-hour trip.

Explanation:

Diameter of the car wheel = d = 0.4 m

Radius of the car wheel = r = 0.5 d = 0.5 × 0.4 m =0.2 m

Distance covered in 1 complete revolution = 2\pi r

Distance covered in 100,000 complete revolution,D = 2\pi r\times 100,000

D=2\times 3.14\times 0.2 m\times 100,000=125,663.71 m

1 m = 0.001 km

125,663.71 m = 125,663.71 × 0.001 km = 125.66371 km

Time taken to complete 100,000 revolution by a wheel = t = 3 hours

Speed of car : S

S=\frac{125.66371 km}{3hours}=41.89 km/h\approx 42 km/h

42 km/h was the average speed of the car for its three-hour trip.

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