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3 years ago

There are more electrons than protons in a negatively charged atom. 1. True 2. False

Physics

2 answers:

n200080 [17]3 years ago

4 0

The correct response is the first choice on the list, namely "1. True".

tekilochka [14]3 years ago

4 0

true 100% positve have a nice day

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Two lamps, each having reisistance of 3 Ohms, connect in a series. What current will flow if a voltage source of 5 V is connecte

Ket [755]

Total resistance will be R1 + R2.
And the formula will be I equals V over R.
V=5
I=?
R=6

I= 0,83 amps

6 0

3 years ago

What causes resistance in an electric circuit? How is resistance measured?

Sergeeva-Olga [200]

Resistance can be caused by specific resistance tools, like resistors, or loads (the part of the component that uses the electricity) like a light bulb or a speaker. Resistance is measured in ohms and can be measured by a multimeter.

6 0

3 years ago

If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be Group of answer choi

vivado [14]

Answer:

We cannot tell from the information given

Explanation:

Given;

mass of the box, m = 5 kg

first force, F₁ = 10 N

second force, F₂ = 5 N

(I) Assuming the two forces are acting horizontally in opposite direction, the resultant force on the box is calculated as;

∑Fx = 10 N - 5 N

= 5 N

Apply Newton's second law of motion;

∑Fx = ma

a = ∑Fx/m

a = 5 / 5

a = 1 m/s² in the direction of the 10 N force.

(II) Also, if the two forces are acting in the same direction, the resultant force is calculated as;

∑Fx = 10 N + 5 N

∑Fx = 15 N

a = 15 / 5

a = 3 m/s²

Therefore, the information given is not enough to determine the acceleration of the box.

8 0

3 years ago

A billiard ball moving at 5 m/s strikes a stationary ball of the same mass. After the collision, the original ball moves at a ve

SIZIF [17.4K]

90 degrees - 30 = 60 degrees

Velocity = (5m/s - 4.35m/s x cos(30)) / cos(60)

Velocity = 2.47 m/s

The answer is D) 2.47 m/s at 61.9 degrees

8 0

3 years ago

Which of the following describes one of the main features of wave-particle duality?

steposvetlana [31]

<h2>Answer: as mass increases, the wave nature of matter is less easy to observe.</h2>

At the beginning of the 20th century the French physicist Louis De Broglie proposed the existence of matter waves, that is to say that <u>all matter has a wave associated with it.</u>

In this sense, the de Broglie wavelength $\lambda$ is given by the following formula:

$\lambda=\frac{h}{p}$ (1)

Where:

$h$ is the Planck constant

$p$ is the momentum of the atom, which is given by:

$p=m.v$ (2)

Where:

$m$ is the mass

$v$ is the velocity

Substituting (2) in (1):

$\lambda=\frac{h}{m.v}[\tex] (3)As we can see, if we increase the mass, the wavelength decreases (because [tex]\lambda$ is inversely proportional to $m$ ).

Therefore, if the wavelength decreases the wave nature of matter is less easy to observe.

The other options are incorrect because:

a) as $v$ increases $\lambda$ decreases and the particle nature matter becomes more evident

b) as $p$ decreases $\lambda$ increases and the wave nature matter becomes more evident

c) There is also a relation between the wavelength and the energy $E$ :

$\lambda=\frac{hc}{E}$

So, as energy increases, the particle nature matter becomes more evident and the wave nature of matter becomes harder to observe

8 0

4 years ago