3 years ago

How far can light travel in one year?

Physics

1 answer:

elena-14-01-66 [18.8K]3 years ago

8 0

The answer is b
300,000 km

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Determine the capacitive reactance for a 20 uF capacitor that is across a 20 volt, 60 Hz source

aleksandr82 [10.1K]

Answer:

Capacitive reactance is 132.6 Ω.

Explanation:

It is given that,

Capacitance, $C=20\ \mu F=20\times 10^{-6}\ F=2\times 10^{-5}\ F$

Voltage source, V = 20 volt

Frequency of source, f = 60 Hz

We need to find the capacitive reactance. It is defined as the reactance for a capacitor. It is given by :

$X_C=\dfrac{1}{2\pi fC}$

$X_C=\dfrac{1}{2\pi \times 60\ Hz\times 2\times 10^{-5}\ F}$

$X_C=132.6\ \Omega$

So, the capacitive reactance of the capacitor is 132.6 Ω. Hence, this is the required solution.

4 0

3 years ago

A 250 kg car has 6875 kg•m/s of momentum. What is it’s velocity?

liraira [26]

Answer:

v = 27.5 m/s

Explanation:

p = m × v

6,875 = 250 × v

250v = 6,875

v = 6,875/250

v = 27.5 m/s

5 0

2 years ago

According to the ideal gas law, increasing the volume of a closed reaction container decreases the thermal energy because the

viva [34]

B is ur answer the temputer does increase

4 0

3 years ago

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A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is

MariettaO [177]

Answer:

$I=0.0795\ W/m^2$

Explanation:

Given that,

Power of electromagnetic energy, P = 100 W

We need to find the intensity at a distance of 10 m from the source. Intensity is equal to the power per unit area. So,

$I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{100}{4\pi (10)^2}\\\\I=0.0795\ W/m^2$

So, the intensity at a distance of 10 m is $0.0795\ W/m^2$

5 0

3 years ago

A piece of silver of volume 10cm has a mass<br>of 103g . Find its Density.

klemol [59]

Answer:

d=10.3g/cm³

Explanation:

density is defined as the ratio of mass of an object to its mass volume.

d= m/V

Substitute the values given in the problem

d=(103g)/(10cm³)

d=10.3g/cm³

3 0

3 years ago