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postnew [5]
3 years ago
8

1. A car is traveling at 36 m/s hits a tree and comes to rest in 0.05 seconds.

Physics
1 answer:
QveST [7]3 years ago
3 0

Answer: a. -720m/s^2

b. Yes, airbags will deploy

Explanation:

The formula for acceleration is:

= (Final velocity - Initial velocity)/Time

Final velocity = 0m/s

Initial velocity = 36m/s

Time taken = 0.05s

= (Final velocity - Initial velocity)/Time

= (0 - 36)/0.05

= -36/0.05

= -720m/s^2.

Since it's negative, it shows that there was a deceleration.

2. Yes the airbag will deploy since the acceleration gotten is more than -600 m/s^2.

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Answer:

 ω₂=1.20

Explanation:

Given that

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Initial mass moment of inertia

I_1=\dfrac{M+m}{2}r^2

I_1=\dfrac{15+9}{2}\times 0.25^2\ kg.m^2

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Final mass moment of inertia

I_2=\dfrac{M}{2}r^2

I_2=\dfrac{15}{2}\times 0.25^2\ kg.m^2

I_2=0.468\ kg.m^2

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Now by conservation angular momentum

I₁ ω₁ =ω₂ I₂

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ω₂=1.20

7 0
3 years ago
A skydiver jumps out of a plane flying at an altitude of 5,500 meters. How fast is the skydiver going when they get to the groun
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2,500 feet (760 meters)

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v = 141.152 miles per hour

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Answer:

101 N

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