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3 years ago

13

To calculate acceleration you must know both the objects velocity and_____

1 answer:

amm18123 years ago

8 0

You need to know the time as well.

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When two systems in contact are not at the same temperature, _____ occurs. heat flow expansion evaporation friction

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Heat flow.....it is called conduction !

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Planets move around the sun in elliptical orbits.<br> A. true<br> B. false

julia-pushkina [17]

Answer:All planets move in elliptical orbits, with the sun at one focus. This is one of Kepler's laws. The elliptical shape of the orbit is a result of the inverse square force of gravity. The eccentricity of the ellipse is greatly exaggerated here.

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Speed1=20 m/s. time1=5sec

lina2011 [118]

Answer:

<h2><em><u>2</u></em><em><u>1</u></em><em><u>.</u></em><em><u>2</u></em><em><u>5</u></em><em><u> </u></em><em><u>m</u></em><em><u>/</u></em><em><u>s</u></em></h2>

Explanation:

<h2><em>AVERAGE</em><em> </em><em>S</em><em>P</em><em>E</em><em>E</em><em>D</em><em>=</em></h2>

<em> $= \frac{s1 t1+ s2t2 + s3t3}{t1 + t2 + t3}$ </em>

<em> $= \frac{20 \times 10 + 30 \times 5 + 15 \times 5}{10 + 5 + 5}$ </em>

<em> $= \frac{200 + 150 + 75}{20}$ </em>

<em> $= \frac{425}{20}$ </em>

<em> $= 21.25 ms$ </em>

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2 years ago