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olga2289 [7]
3 years ago
11

A 328-kg car moving at 19.1 m/s in the + x direction hits from behind a second car moving at 13.0 m/s in the same direction. If

the second car has a mass of 790 kg and a speed of 15.1 m/s right after the collision, what is the velocity of the first car after this sudden collision?
Physics
1 answer:
Kisachek [45]3 years ago
8 0

Answer:

+14.0 m/s

Explanation:

we have mV + Mv = mU + Mu we solve for U = (mV + Mv - Mu)/m = (328*19.1 + 790*13 - 790*15.1)/328 = 14. Answer

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Through gases as the bonds are tightly bound. Mechanical waves travel by vibrating through the medium so the more tight the bonds , the faster the waves. 
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4 years ago
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A fire hose 5 centimeters in diameter is used to fill a 225-liter bucket. If it takes 15 seconds to fill the bucket, what is the
Vika [28.1K]
I believe you ask about speed at the end of the hose:

The volume of the bucket is 225 liters which is equal to 225 dm^{3}.
V=225dm^{3}
Hose's cross section can be counted with the typical circle's area formula (with diameter instead of radius, that's why you've got a fraction):
A=3,14*\frac{d^{2}}{4}}=0,19625dm^{2}

225dm^{3} are filled within 15 second.

As the bucket is being filled you can say that it's volume is the volume of the water that flowed out of the hose, then:
V=A*h
The speed of the water can be counted with equation:
v=\frac{h}{t}
After extracting h from the volume's equation you get:
v=\frac{V}{A*t}
When you count the fraction you get the answer:
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4 0
3 years ago
A spaceship travels at 1,321 km/h. How many miles can it travel in 6.19 seconds?
sergiy2304 [10]

Answer:

2.271386111 km/s

Explanation:

1321÷60hrs÷60mins×6.19s=2.27km

7 0
3 years ago
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How much time is required for a car to reach a speed of 100 m/s if it starts from rest and its average acceleration is 12 m/s2?
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Answer:

t = 8.3s

Explanation:

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V = U + at

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3 years ago
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Which object is completely opaque?
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Answer:

a

Explanation:

light can not pass through it completely

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