4 years ago

If a force has a negative value, such as -100 N, that means the force

1 answer:

8 0

Option b is the correct one.

The negative sign before the force gives it a direction whether it's opposite to another force.

Hope this helps!

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If an object is 16.76 cm in front of a convex mirror that has a focal length of 67.1 cm, how far behind the mirror will the imag

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F = focal lenght = 67.1 cm

u= distance between mirror and object = 16.76 cm

1/f = 1/v + 1/u

1/67.1 = -1/16.76 + 1/u

1/67.1 + 1/16.76 = 1/u

u = 13.41

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1 year ago

Count the dots to make sure that all of the valence electrons are represented 2

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Do you have a diagram or anything?

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4 years ago

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Fudgin [204]

Answer:

64.50816

Explanation:

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3 years ago

In the 1920s what did Edmund hubble notice about the galaxies

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Hubble noticed that the galaxies were moving away from us, which meant the universe was expanding.

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3 years ago

A sound system is being set up in a gazebo in a park. It needs to produce music so that everyone can hear it. How much power wou

Agata [3.3K]

Answer:

Power of the speakers = 1.57 $\times 10^{-6} W$

Explanation:

There are speakers setup in a park and we have to find the power it would require to have intensity of sound to be $10^{-8} W/m^2$ at a distance of 5 meter.

In one dimension the intensity is constant as the wave travels. In two or three dimensions, however, the intensity decreases as you get further from the source.

Intensity is inversely proportional to the square of the distance from the point of sound production.

Here area = 2 $\times \pi \times r^{2}$

area = 157 $m^{2}$

$Intensity = \frac{Power}{Area}$

$Power = intensity \times area$

Power = $10^{-8} \times 157Power = 1.57 [tex]\times 10^{-6} W$

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3 years ago