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4 years ago

7

The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten i

n (a) years, (b) seconds.

1 answer:

Levart [38]4 years ago

8 0

It could be express as (A) 14 x 10 to the tenth power or (b) 4.415 x 10 to the seventeenth power.

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When a rubber band is pulled back on your finger but not yet let go how is that potential energy?

loris [4]

It is potential energy because the band is not in movement, th band has the potential to move.

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3 years ago

Zolol [24]

Answer:

48

Explanation:

you basically divide 1200 into 25

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4 years ago

Can someone check if what i wrote so far makes sense and if i made a mistake.

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3 years ago

Read 2 more answers

A person sitting on a pier observes incoming waves that have a sinusoidal form with a distance of 2.5 m between the crests. Of a

Doss [256]

Answer:

Part(a): The frequency is $\bf{0.2~Hz}$ .

Part(b): The speed of the wave is $\bf{0.5~m/s}$ .

Explanation:

Given:

The distance between the crests of the wave, $d = 2.5~m$ .

The time required for the wave to laps against the pier, $t = 5.0~s$

The distance between any two crests of a wave is known as the wavelength of the wave. So the wavelength of the wave is $\lambda = 2.5~m$ .

Also, the time required for the wave for each laps is the time period of oscillation and it is given by $T = 5.0~s$ .

Part(a):

The relation between the frequency and time period is given by

$\nu = \dfrac{1}{T}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(1)$

Substituting the value of $T$ in equation (1), we have

$\nu &=& \dfrac{1}{5.0~s}\\~~~&=& 0.2~Hz$

Part(b):

The relation between the velocity of a wave to its frequency is given by

$v = \nu \lambda~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(2)$

Substituting the value of $\nu$ and $\lambda$ in equation (2), we have

$v &=& (0.2~Hz)(2.5~m)\\~~~&=& 0.5~m/s$

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3 years ago

Which Sentence Describes A Physical Property

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The answer is (a).

Golf balls have a higher density than water hence sink to the bottom.

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4 years ago