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Any of two or more forms of the same element which differ only in the number of neutrons their atoms contain is called an

1 answer:

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C. isotope

Isotopes have the same atomic number but different mass number because of the difference in the number of neutrons in the nucleus of the atom.

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Radiant energy travels in straight lines until it strikes an object where it can be ______,_____or transmitted

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<span>Radiant energy travels in straight lines until it strikes an object where it can be absorbed, reflected or transmitted</span>

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A hot-air balloon is ascending at the rate of 12 m/s and is 80 m above the ground when a package is dropped over the side. (a) H

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Answer:

Explanation:

Given

balloon is ascending at the rate of $u=12\ m/s$

Balloon is at a height of $s=80\ m$

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using

$v^2-u^2=2as$

where v=final velocity

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a=acceleration

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time taken is given by

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substituting values

$41.37=-12+9.8\times t$

as we consider downward direction as positive

$t=\frac{53.37}{9.8}$

$t=5.44\ s$

therefore time taken to reach the bottom is t=5.44 s

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Explanation:

Acceleration is the rate of change of velocity with time. When acceleration increases a body moves a faster velocity.

In the graph acceleration at time t= 100s is rapidly increasing.
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