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Anna35 [415]
3 years ago
7

After a hold up, Robin Banks flees in his 1575 kg getaway car at 20 m/s. He crashes into a 45 kg highway barrel which is at rest

. If Robin Bank’s car moves at 18.9 m/s after the collision, how fast does the barrel move after being hit?
Physics
2 answers:
fiasKO [112]3 years ago
7 0

Answer:

v = 38.9 m/s

Explanation:

Dimas [21]3 years ago
6 0

v = 38.5 m/s

Explanation:

P1 = P2 (conservation law of linear momentum)

(1575 kg)(20 m/s) + (45 m/s)(0) = (1575 kg)(18.9 m/s) + 45v

Solving for v

v = 38.5 m/s

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3 years ago
You put a bottle of soft drink in a refrigerator and leave it until its temperature has dropped 12.0K .
Bingel [31]

Answer: a) - 437.8° F, b) - 261°c.

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5 (°F - 32) = 9 (k - 273)

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For question A, k = 12.0, by substituting to have the value for °F, we have

5(°F - 32) = 9 ( 12 - 273)

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5(°F - 32) = - 2349

°F - 32 = - 2349/5

°F - 32 = - 469.8

°F = - 469.8 + 32

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Question B

The centigrade and kelvin scale are related by the formulae below

°c = k - 273

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°c = 12 - 273

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3 years ago
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