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alex41 [277]
3 years ago
9

Suppose that the acceleration of a model rocket is proportional to the difference between 100 ft/sec and the rocket's velocity.

If it is initially at rest and its initial acceleration is 150 ft/sec2, how long will it take to accelerate to 80 ft/s
Physics
1 answer:
sp2606 [1]3 years ago
3 0

Answer:

Explanation:

initial velocity, u = 0

final velocity, v = 80 ft/s

acceleration, a = 150 ft/s²

Let the time taken is t.

v = u + at

80 = 0 + 150 x t

t = 0.53 second

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The specific heat capacity of ethanol is 2440J/kg °C. How many joules of energy will be required to heat 150g ethanol to 35°C if
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Answer:

Required energy = 4758 J

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Using the following formula and substituting the values, we get:

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8 0
3 years ago
A 2000kg car experiences a braking force of 10000N and skids to a stop in 6 seconds. The speed of the car just before the brakes
mylen [45]

Answer:

D. 30m/s

Explanation:

According to the equation of motion

v=u +at

v = Final velocity

u = initial velocity

a = acceleration

t = time taken

Since we don't know the acceleration of the body, we will find its acceleration using newtons first law of motion F = ma

10000 =2000a

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t = 6seconds

Substituting this datas in the formula

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4 0
3 years ago
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