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3 years ago

Which is a FALSE statement about elements?

Physics

2 answers:

Musya8 [376]3 years ago

5 0

Answer:

C. Each element have its own neutron number seems false.

Explanation:

In the given options, C options seems incorrect because

A. Each element have its own proton number which is equal to its electron number.

B. Each element have its own atomic number. Every elements have a unique atomic number.

D Each element have its own chemical symbol which is shown in periodic table.

But each atom do not have their specific neutron number.

rodikova [14]3 years ago

3 0

C is incorrect because the atomic number and symbol are the only ones displayed.

I think it could be A but it is most likely C

Hope it helps!!

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A skater extends her arms, holding a 2 kg mass in each hand. She is rotating about a vertical axis at a given rate. She brings h

Usimov [2.4K]

Explanation:

It is known that relation between torque and angular acceleration is as follows.

$\tau = I \times \alpha$

and, I = $\sum mr^{2}$

So, $I_{1} = 2 kg \times (1 m)^{2} + 2 kg \times (1 m)^{2}$

= 4 $kg m^{2}$

$\tau_{1} = 4 kg m^{2} \times \alpha_{1}$

$\tau_{2} = I_{2} \alpha_{2}$

So, $I_{2} = 2 kg \times (0.5 m)^{2} + 2 kg \times (0.5 m)^{2}$

= 1 $kg m^{2}$

as $\tau_{2} = I_{2} \alpha_{2}$

= $1 kg m^{2} \times \alpha_{2}$

Hence, $\tau_{1} = \tau_{2}$

$4 \alpha_{1} = \alpha_{2}$

$\alpha_{1} = \frac{1}{4} \alpha_{2}$

Thus, we can conclude that the new rotation is $\frac{1}{4}$ times that of the first rotation rate.

8 0

3 years ago

If a light Ray is reflected off the shiny surface at 170 degrees at what angle did the light-ray first strike the surface

garri49 [273]

10 degrees would be your answer hope this helps!

4 0

2 years ago

Read 2 more answers

The orbits of ____ lie closer to the sun than does earth's orbit.

Eva8 [605]

Answer:

Mercury and Venus lie closer to Sun than position of Earth

Explanation:

As we know that all planets around the sun in the range of their distance can be arranged as following:

1). Mercury.

2). Venus.

3). Earth.

4). Mars.

5). Jupiter.

6). Saturn.

7). Uranus.

8). Neptune.

Since Earth lie at 3rd position from sun so two closer planets are Mercury and Venus

5 0

3 years ago

A temperature of 20 degrees celsius is equivalent to approximately

Nataly_w [17]

68 degrees would be the answer

3 0

3 years ago

A heater has resistance of 10 ohms. It operates at 120 volts. a. What is the current through the heater?

Natali5045456 [20]

Answer:

I = 12 A

Explanation:

For this exercise we use the relationship that voltage is proportional to the product of current and resistance

V = I R

I = V / R

let's calculate

I = 120/10

I = 12 A

4 0

2 years ago