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aleksklad [387]
2 years ago
9

to travel at a constant velocity, a car exerts force that is 551N to balance air resistance. how much work does the car do on th

e air as it tavels 161km from columbus to to cincinatti
Physics
1 answer:
densk [106]2 years ago
7 0

Answer:88711000joules

Explanation:

Firstly we have to convert 161km to meters

161km=161×1000m=161000m

Work=force×distance

Work=551×161000

Work=88711000joules

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In physics 28.97 + 45.876 adds up to what?
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A 0.0450 kg bullet is accelerated from rest to a speed of 425 m/s in a 2.25 kg rifle (which is inititally at rest). The pain of
Mrac [35]

Answer:

If the rifle is held loosely away from the shoulder, the recoil velocity will be of -8.5 m/s, and the kinetic energy the rifle gains will be 81.28 J.

Explanation:

By momentum conservation, <em>and given the bullit and the recoil are in a straight line</em>, the momentum analysis will be <em>unidimentional</em>. As the initial momentum is equal to zero (the masses are at rest), we have that the final momentum equals zero, so

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<em>But we have to keep in mind that the bullit accelerate from rest to a speed of 425 m/s</em>, then <u>if the rifle were against the shoulder, the recoil velocity would be a fraction of the result obtained</u>, but, as the gun is a few centimeters away from the shoulder, it is assumed that the bullit get to its final velocity, so the kick of the gun, gets to its final velocity \bold{v_{r}} too.

Finally, using v_{r} we calculate the kinetic energy as

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HOPE THIS HELPS!!!
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