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tino4ka555 [31]
3 years ago
8

Please give me 7th grade science fair ideas?

Physics
1 answer:
Tems11 [23]3 years ago
7 0
1) the electromagnetic spectrum and light 2) how the eye works and what the brain has to do with it 3) how nuclear anf atomic structures work
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A __________ is a push or pull.​
maria [59]

Answer:

force

Explanation:

Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.

5 0
2 years ago
When you whirl a can at the end of a string in a circular path, what is the direction of that force that acts on that can?
SashulF [63]
Centrifugal Force .. hope this helps :)
7 0
3 years ago
Consider an infinetly long hollow cylindrical wire. The wire has an outer diameter b and the clindrical hole at its center has d
Nadusha1986 [10]

Answer:

B = (μ₀*i/(2*π*x))*(x²-(a/2)²)/((b/2)²-(a/2)²)

Explanation:

Given

Outer diameter of the wire = b  ⇒ R = b/2

Diameter of the clindrical hole at the center = a  ⇒ r = a/2

The current that flows from left to right and is uniformly spread over the region between a and b = i

We apply Ampere's Law

Using the following formula for  a/2 ≤ x ≤ b/2

B = (μ₀*i/(2*π*x))*(x²-(a/2)²)/((b/2)²-(a/2)²)

6 0
2 years ago
PLEASE PLEASE PLEASE HELP PLEASE
RideAnS [48]

Answer:

Because there is too smooth

4 0
2 years ago
an electromagnetic wave has an electric field with peak value 120. What is the averge energy delievered to a surface
lianna [129]

Answer:

The average energy delivered to a surface is 19.116 W/m².

Explanation:

Given;

maximum electric field, E₀ = 120 v/m

The average energy delivered by the wave to a surface is given by

I_{avg} = \frac{c\epsilon_ o E_o^2}{2}

where;

c is the speed of light, = 3 x 10⁸ m/s

ε₀ is the permittivity of free space = 8.85 x 10⁻¹² c²/Nm²

I_{avg} = \frac{c\epsilon_ o E_o^2}{2} \\\\I_{avg} = \frac{(3*10^8)(8.85*10^{-12})( 120)^2}{2}\\\\ I_{avg} =19.116 \ W/m^2

Therefore, the average energy delivered to a surface is 19.116 W/m².

7 0
2 years ago
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