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cestrela7 [59]
3 years ago
8

A 20. cm telescope collects how many times the light collected by a 5.0 cm telescope?

Physics
1 answer:
MrRa [10]3 years ago
5 0
The light collected by a telescope is proportional to the area of the telescope.

The area of a telescope is π * (Diameter / 2) ^2 = π * (Diameter)^2 / 4.

So, for the 20.0 cm telescope, area = π * (20.0cm)^2 / 4.

And for the 5.0 cm telescope, area = π * (5.0 cm)^2 / 4

So, divide both expressions to find the ratio of collection of light of one telescope to the other:=> (20.0)^2 / (5.0)^2 = (20.0 / 5.0)^2 = 4^2 = 16

Then, the 20.0 cm telescope collects 16 times the ligth that the 5.0 cm telescope collect.    <--- answer
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True, when charging a secondary cell, energy can be stored within a dielectric material using an electric field.

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The electric field in a capacitor separates the negative and positive charges in the dielectric material, this causes an attractive force between each plate and the dielectric.

The dielectric material can store electric energy due to its polarization in the presence of external electric field, which causes the positive charge to store on one electrode and negative charge on the other.

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▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪

Let's solve ~

Given terms :

  • Mass (m) = 7 kg

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The formula to find kinetic Energy is ~

\boxed{ \boxed{ \sf{ \frac{1}{2}  m{v}^{2} }}}

Now, apply the formula according to given situation

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: \dfrac{1}{2}  \times 7 \times ( {4)}^{2}

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: \dfrac{1}{2}  \times 7 \times 16

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:7 \times 8

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:56 \:  \: joules

Therefore, the kinetic Energy of the car is 56 joules

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