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mel-nik [20]
3 years ago
13

Helppppppppppppppppp

Physics
1 answer:
alexira [117]3 years ago
6 0

Answer:

It is A when the firework explodes it creates heat and which makes different colors

Explanation:

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What is the Difference between accuracy and precision ?<br>​
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Accuracy measures how close results are to the true or known value. Precision, on the other hand, measures how close results are to one another.

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Which of the following pieces of laboratory equipment is not directly used to make measurements
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I believe the answer is a test tube.
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How long does it take the students’ kettle to come to the boil if 3 kg of ice at 0 °C is put in it? The latent heat of fusion of
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111.333

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What is gamma radiation composed of?
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2. Two cars A and B are heading forward. The velocity of A and B are 30 m/s and 20 m/s
KengaRu [80]

Answer:

A.) 27000 kgm/s

18000 kgm/s

B.) Va = 22 m/s

C.) 19800 kgm/s

25200 kgm/s

Explanation: Given that the velocity of A and B are 30 m/s and 20 m/s. And of the same mass M = 9 × 10^5g

M = 9×10^5/1000 = 900 kg

A.) Initial momentum of A

Mu = 900 × 30 = 27000 kgm/s

Initial momentum of B

Mu = 900 × 20 = 18000 kgm/s

B.) if they have an accident and then the velocity of the B is 28 m/s, find out velocity of A.

Momentum before impact = momentum after impact

Given that Vb = 28 m/s

27000 + 18000 = 900Va + 900 × 28

45000 = 900Va + 25200

900Va = 45000 - 25200

900Va = 19800

Va = 19800/900

Va = 22 m/s

C.) Momentum of A after impact

MV = 900 × 22 = 19800 kgm/s

Momentum of B after impact

MV = 900 × 28 = 25200 kgm/s

8 0
3 years ago
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