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blagie [28]
3 years ago
10

A 20 N force acts for 10 s on a skateboard. What is the impulse imparted to the skateboard? What is the skateboard’s change in m

omentum?
Physics
1 answer:
arlik [135]3 years ago
8 0

Answer:

impulse = force * time = 20 * 10 = 200 Ns

change in momentum = impulse = 200 kgm/s

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\boxed{\sf \tau=rFsin\theta}

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\\ \rm\hookrightarrow 40=2Fsin40

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The average speed of the whole travel is equal to <u>400 mph</u>.

Why?

From the statement, we know that whole travel is divided into three parts. For the first part (traveling from New York to Chicago), we have that it was 3.25 hours and the covered distance was half of the total distance (1400mi). For the second part, we have that it was 1 hour (layover time), and the covered no distance. For the third part (traveling from Chicago to Los Angeles), we have that it was 2.75 hours, and it took the other half of the total distance (1400mi).

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AverageSpeed=\frac{distance_{1}+distance_{2}+distance_{3}}{time_{1}+time{2}+time_{3}}

Now, substituting and calculating, we have:

AverageSpeed=\frac{1400mi+0mi+1400mi}{3.25h+1h+2.75h}

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Hence, we have the average speed of the whole travel is equal to 400 mph.

Have a nice day!

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