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Tom [10]
3 years ago
7

An Olympic runner complete the 200 m sprint and 23 seconds. What is the runners average speed (round your answer to the nearest

10th of a meter per second.)
Physics
1 answer:
kipiarov [429]3 years ago
3 0
Should be 8.7 m/s. Just divide 200 by 23 and round from there.
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1 growth. Go from one cell/( zygote to a trillion)
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4 years ago
Suppose the balloon is descending with a constant speed of 4.2 m/s when the bag of sand comes loose at a height of 35 m. What is
Margaret [11]

Answer:

2.28 s

Explanation:

Let g = 9.8 m/s2 and neglect air resistance. The box of sand with an initial velocity of 4.2m/s in free fall would yield the following equation of motion

s = v_0t + gt^2/2

35 = 4.2t + 9.8t^2/2

4.9t^2 + 4.2t - 35 = 0

t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

t= \frac{-4.2\pm \sqrt{(4.2)^2 - 4*(4.9)*(-35)}}{2*(4.9)}

t= \frac{-4.2\pm26.53}{9.8}

t = 2.28 or t = -3.14

Since t can only be positive we will pick t = 2.28 s

7 0
3 years ago
The half life of uranium-235 is 4. 5 billion years. If 0. 5 half-lives have elapsed, how many years have gone by?
igor_vitrenko [27]

Answer:

2.25 billion years

Explanation:

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5 0
2 years ago
What would be the resulting charge of carbon (C) after this element loses four electrons?
Sladkaya [172]

Answer:

Carbon will become positively charged.

The charge of Carbon will be +4.

Explanation:

The charge of Carbon will be +4.

In the periodic table, elements that give out  or lose electrons during electrochemical combinations are called electropositive elements. If carbon loses electrons during the chemical combination, Carbon will become positively charged, with a valency equal to the number of electrons that it lost.

This will make carbon have a charge of +4

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What are two components that make up force?
Sveta_85 [38]
The answer is mass and acceleration
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4 years ago
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