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Angelina_Jolie [31]

3 years ago

12

Is it true or false that all electromagnetic waves travel at the same speed in a vacuum?

2 answers:

stira [4]3 years ago

6 0

Yes they do
<span>Normally the speed is 186,282 miles per second
and all of the electromagnetic waves travels at this speed so they all travel at the same speed.
Hope this helps!

</span>

Nady [450]3 years ago

5 0

Truer words were never spoken.

The "speed of light" is also the speed of radio, the speed of microwaves,
the speed of heat, the speed of X-rays, etc.

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An electron (charge −e=−1.60×10−19C−e=−1.60×10−19C) is at rest at a distance 1.00×10−10 m 1.00×10−10m from the center of a nucle

shtirl [24]

Answer:

$-9.45\times10^{-16} \text{ J}$

Explanation:

According to Coulomb's law, the force of attraction between two point charges, $q_1$ and $q_2$ , separated by a distance $d$ is given by

$F = k\dfrac{q_1q_2}{d^2}$

$k$ is a constant with a value of $9\times10^9\text{ F/m}$ .

When we substitute the values from the question,

$F = (9\times10^9\text{ F/m})\dfrac{(-1.60\times10^{-19} \text{ C})\times(+1.31\times10^{-17}\text{ C})}{(1.00\times10^{-10}\text{ m})^2} = -1.89\times10^{-6} \text{ N}$

This value is negative because it is in a direction towards the positive charge.

The work done in moving the electron from the nucleus is

$W = F\times r$

$W = (-1.89\times 10^{-6} \text{ N})\times(5.00\times10^{-10}\text{ m}) = -9.45\times10^{-16} \text{ J}$

This is negative because work is done on the electron, not by it.

3 0

3 years ago

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply

kykrilka [37]

Answer: Got It!

<em>Explanation: </em>let s = speed at launch

v = 0 at top = s sin 63 - g t

so at top

t = s sin 63/g = .0909 s

h = 13.6 = s sin 63 t - 4.9 t^2

13.6 = .081s^2 - .0405 s^2

s^2 = 336

s = 18.3 m/s

0 0

4 0

3 years ago

When is the angular momentum of a system constant?

Artist 52 [7]

I think it’s a but I’m not 100% sure

4 0

3 years ago

Your electric drill rotates initially at 5.35 rad/s. You slide the speed control and cause the drill to undergo constant angular

Agata [3.3K]

Answer:

The angular displacement is $\theta = 29.6 \ rad$

Explanation:

From the question we are told that

The initial angular speed is $w = 5.35 \ rad/s$

The angular acceleration is $\alpha = 0.331 rad /s^2$

The time take is $t = 4.81 \ s$

Generally the angular displacement is mathematically represented as

$\theta = w * t + \frac{1}{2} \alpha * t^2$

substituting values

$\theta = 5.35 * 4.81 + \frac{1}{2} * 0.331 * (4.81)^2$

$\theta = 29.6 \ rad$

3 0

3 years ago

Which of the following best explains how earth is heated through radiation

lawyer [7]

Answer:

The sun touches earth during daytime and the suns rays heat our earth giving us heat. The sun heating the earth is also considered radiation.

Explanation:

6 0

3 years ago