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lesya692 [45]
3 years ago
8

In which case would electrical potential energy be built up and stored in the electric field? a) A positive charge is moved towa

rd a negative charge. b) A positive charge is moved toward a positive charge. c) A negative charge is moved away from a negative charge. d) none of the above
Physics
1 answer:
mr_godi [17]3 years ago
5 0

Answer:

The correct option is B

Explanation:

Although, it is common knowledge that in an electric field, unlike charges attract and like charges repel. However, to build up an electric potential, a positive charge is brought close to another positive charge - this causes work done to be changed to electric potential energy and stored in the electric field.

It should however be noted that when a negative charge is moved away from a positive charge, the negative charge gains electric potential energy.

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How do scientists construct models of atoms and molecules?
9966 [12]
Mr. Roentgen's x-rays allowed scientists to measure the size of the atom. The x-rays were small enough to discern the atomic clouds. This was done by scattering x-rays from atoms and measuring their size just as Rutherford had done earlier by hitting atoms with other nuclei starting with alpha particles.
6 0
3 years ago
If the ultraviolet photon has a wavelength of 249 nm and one of the photons emitted by the fluorescent material has a wavelength
melamori03 [73]

Answer:

601 nm

Explanation:

Energy of photon having wavelength of λ nm

= \frac{1244}{\lambda}eV

Energy of 249 nm photon

=\frac{1244}{249}

=4.996 eV

Similarly energy of 425nm photon

=\frac{1244}{425}

=2.927 eV

Difference = 2.069 eV.

This energy will give rise to another photon whose wavelength will be

λ = \frac{1244}{2.069}

= 601 nm.

6 0
4 years ago
A baseball player throws a baseball at 42 m/s. If the other player catching the baseball is 18 m from the player, how much time
Hitman42 [59]

Divide the distance by the speed:

(18 m) / (42 m/s) = 3/7 s ≈ 0.43 s

3 0
3 years ago
When the point of reference (the observer) is in motion, it flips the "rules" of vector addition (you ADD the vectors going in o
earnstyle [38]

Answer:

True

Explanation:

4 0
3 years ago
A playground merry-go-round of radius r = 2.00 m has a moment of inertia = 250 ⋅ , and is rotating at 10.0 rev/min about a frict
bagirrra123 [75]

Answer:

330kgm^2

Explanation:

We are given that

Radius,r=2 m

Moment of inertia,I=250kgm^2

Angular velocity,\omega_1=10 rev/min

Mass of child,m=20 kg

We have to find the new moment of inertia of the merry go round.

New moment of inertia ,I'=mr^2+I

Using the formula

I'=20(2)^2+250

I'=80+250=330kgm^2

Hence, the new moment of inertia of the merry -go-round=330kgm^2

8 0
3 years ago
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