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Sergio039 [100]
3 years ago
6

I WIL A 2.00-kg object traveling east at 20.0 m/s collides with a 3.00-kg object traveling west at 10.0 m/s. After the collision

, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision? . .
Physics
1 answer:
pishuonlain [190]3 years ago
4 0
Using the following given values:

Object 1:
Mass = M1 = 2 kg
Velocity before collision = Vb1 = 20 m/s
Velocity after collision = Va1 = -5 m/s 

Object 2:
Mass = M2 = 3 kg
Velocity before collision = Vb2 = -10 m/s
Velocity after collision = Va2 = ? m/s<span> 
</span>
Obtaining Va2 via law of conservation of momentum:

total momentum after collision = total momentum before collision
M1 * Va1 + M2 * Va2 = M1 * Vb1 + M2 * Vb2
2*-5 + 3Va2 = 2*20 + 3*-10
Va2 = 6.67

Total kinetic energy before collision:

KE1 = (1/2)*M1*Vb1^2 + (1/2)*M2*Vb2^2
<span>KE1 = (1/2)*2*(20)^2 + (1/2)*3*(-10)^2
KE1 = 550 J

</span>Total kinetic energy after collision:

KE2 = (1/2)*M1*Va1^2 + (1/2)*M2*Va2^2
<span>KE2 = (1/2)*2*(-5)^2 + (1/2)*3*(6.67)^2
KE2 = 91.73 J
</span>
Total kinetic energy lost:

Energy lost = KE1 - KE2 = 550 - 91.73 = 458.27 J
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The reverberation time with 800 audiences is 0.875 seconds.

<h3>Reverberation time with 800 audience</h3>

R₁V₁ = R₂V₂

where;

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R₂ = R₁V₁/V₂

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R₂ = 0.875 seconds

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2 years ago
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Tems11 [23]

Answer:

Frequency=10 Hz

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Explanation:

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Frequency=200÷20=10 cycles per second

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Period is usually the reviprocal of frequency hence reciprocal of 10 Hz will be 1/10=0.1 s

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Europe and North America are moving apart by about 5 m per century. As the continents separate, new ocean floor is created along
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Explanation:

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Area = 25,000,000km² * 1m²/1,000,000km²

Area = 25km² in a century.

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