3 years ago

A track star runs 100 meters in 10 seconds. What is the star's average speed?

Physics

2 answers:

Ksju [112]3 years ago

8 0

Answer:

10m/s

Explanation:

Maslowich3 years ago

6 0

Answer: 10

Explanation: Because, 10*10= 100 or 100/10=10

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The answer is both 5sin(60)=4.33 and -5sin(60)=-4.33

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If you kick a ball and the ball accelerates through the air, the forces involved must be

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3 years ago

1) A person riding their bike on a nice cloudy day travels 50 meters in 20 seconds.

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5.59

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3 years ago

Before beginning an experiment Mrs. Wilson warns her science class not to drop the bar magnets on the floor what is the most lik

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3 years ago

For a railgun, determine the current required to accelerate a 1000kg space vehicle to earths escape velocity on 10km of track wi

Troyanec [42]

Answer:

the current is 15.68 × $10^{5}$ A

Explanation:

mass = 1000 kg

magnetic fied = 2T

rail separation = 2m

escape velocity is 11.2km/s = 11.2 × $10^{3}$ m/s

distance = 10 km = $10^{4}$ m

to find out

determine the current

solution

we know force F = I×L×B

here I is current and L is rail separation and B is magnetic field

so F = I ×2×2 = 4 I

acceleration is a = $\frac{F}{mass}$

a = $\frac{4I}{1000}$ m/s²

so equation of motion

v²-u² = 2 a S

here u is initial velocity and S is distance and a is acceleration and v is final velocity

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solve we get I

I = 15.68 × $10^{5}$ A

so the current is 15.68 × $10^{5}$ A

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3 years ago