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Andre45 [30]
3 years ago
7

A subway car whose mass is 52,000. kg is traveling with a velocity of 3.4 m/s due north and collides with a second subway car wh

ose mass is also 52,000. kg and is at rest. If the two cars stick together after the collision, what is the velocity of the two cars?
Physics
1 answer:
SVETLANKA909090 [29]3 years ago
3 0

Answer:

1.7 m/s

Explanation:

52,000kg x 3.4 m/s= 176,800

52,000+52,000= 104,000

176,800/104,000= 1.7m/s

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Answer:

9 N

Explanation:

The centripetal force F is F = mrω^2 = (mv^2)/r where m is mass, r is radius of the curve, ω is angular velocity and v is tangential velocity.

In this case, m = 0.5kg, r = 0.5m, v = 3m/s

So F = [0.5kg(3m/s)^2]/0.5m = 9kg-m/s^2 which is 9N

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4 years ago
A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?
olga55 [171]

Answer:

17.6 m/s²

Explanation:

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a_{avg} = Δv / Δt

We can find Δv by doing

Δv = v_{f} - v_{i}

Replace the values

Δv = 90m/s - 2m/s

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a_{avg} = Δv / Δt

a_{avg} = \frac{88m/s}{5/s}

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