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2 years ago

9

After turning off the television, you approach it. As you get close, but not touching it, the hairs on your arm start to stand u

p. This is an excellent example of static charge built up by

1 answer:

REY [17]2 years ago

5 0

Answer:

electricity duh

Explanation:

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An extraterrestrial creature is standing in front of plane mirror. The height of this creature is H and we know that this creatu

Tatiana [17]

Answer:

c. (H-h/2) above the ground

Explanation:

The mirror must be at least half as tall as the alien, and its base must be located at half of the distance between the alien's eyes and the ground (assuming that the alien doesn't float or levitate).

This question is about the Law of Reflection which states that the angle of reflection = angle of incidence.

I attached an image that can help you understand the concept, although the alien is not included.

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2 years ago

A coil has N turns enclosing an area of A. In a physics laboratory experiment, the coil is rotated during the time interval Δt f

scoray [572]

Answer:

BA

0

$\dfrac{NBA}{\Delta t}$

Explanation:

B = Magnetic field

A = Area

$\theta$ = Angle

t = Time taken

Before rotation the magnetic flux is given by

$\phi_i=BAsin\theta\\\Rightarrow \phi_i=BAsin90\\\Rightarrow \phi_i=BA$

Magnetic flux is BA

After rotation the magnetic flux is given by

$\phi_i=BAsin\theta\\\Rightarrow \phi_i=BAsin0\\\Rightarrow \phi_i=0$

The magnetic flux is 0

Magnitude of emf is given by

$\epsilon=NA\dfrac{d\phi}{dt}\\\Rightarrow \epsilon=\dfrac{NBA}{\Delta t}$

The magnitude of the average emf induced in the entire coil is $\dfrac{NBA}{\Delta t}$

4 0

3 years ago

What kind of charge does an object have if it has extra positive charges

Sever21 [200]

An electrical charge is created when electrons are transferred to or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.

7 0

3 years ago

The difference between a molecule and a compound is that a compound is made up of atoms from . A chemical change creates a new .

ra1l [238]

Explanation:

A molecule can be made up from same or different elements. Whereas a compound will have different atoms.

Therefore, the difference between a molecule and a compound is that a compound is made up of atoms from different elements.

For example, $O_{2}$ is a molecule and NaCl is a compound.

And a chemical change creates a new substance.

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3 years ago

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The transfer of energy by the movement of particles that are in contact with each other

jeka57 [31]

Answer: I belive that the Answer is C.) Conduction

Explanation:

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3 years ago

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