3 years ago

The rate at which light energy is radiated from a source is measured in which of the following units?

Physics

1 answer:

romanna [79]3 years ago

8 0

Answer is Option C Lumen.It is also known as luminous energy.

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A car is traveling at an initial velocity of 23m/s. It begins to accelerate at a rate of 3.5 m/s' for

yaroslaw [1]

Answer: vf = 51 m/s and d= 112 m

Explanation: Solution attached.

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3 years ago

Alan leaves Los Angeles at 8:00 a.m. to drive to San Francisco, 400 mi away. He travels at a steady 46.0 mph . Beth leaves Los A

elena-14-01-66 [18.8K]

Answer:

25 min, 48 sec

Explanation:

Alan:

t = d/v

= 400 mi / 46 mph = 8.70 hr

So it took Alan 8.70 hrs; from 8 am, that's 4:42 pm that he arrives.

t = d/v

= 400 mi / 55 mph = 7.27 hr

So it took Beth 7.27 hrs; from 9 am, that's 4:16:12 that she arrives.

4:42 - 4:16:12 = 25.8 minutes = 25 minutes, 48 sec

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4 years ago

Water is boiling in a clear pot, as shown in the picture. Which takes place as water cycles from the bottom of the pot toward th

nikitadnepr [17]

Hot and cold water rising and sinking through other water
is definitely a description of convection.

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4 years ago

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Two 2.0-cm-diameter insulating spheres have a 6.60 cm space between them. One sphere is charged to + 76.0 nC , the other to - 30

e-lub [12.9K]

Answer:

$5.2\times 10^5N/C$

Explanation:

Since the two charged bodies are symmetric, we can calculate the electric field taking both of them as point charges.

This can be easily seen if we use Gauss's law, $\int{E} \, dA=\frac{Q_{enclosed}}{\epsilon_o}$

We take a larger sphere of radius, say r, as the Gaussian surface. Then the electric field due to the charged sphere at a distance r from it's center is given by,

$E=\frac{1}{4\pi r^2} \frac{Q_{enclosed}}{\epsilon_o}$

which is the same as that of a point charge.

In our problem the charges being of opposite signs, the electric field will add up. Therefore,

$E_{total}=\frac{1}{4\pi\epsilon_o}\frac{q_1+q_2}{r^2}= (9\times10^9) \frac{(76+30)\times10^{-9}}{((1+3.3)\times10^{-2})^2}N/C =5.2\times10^5N/C$

where, $r$ = distance between the center of one sphere to the midpoint (between the 2 spheres)

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3 years ago

Suppose you go outside and look at three stars. Star A is blue, star B is white, and star C is red. Which star is the hottest, a

N76 [4]

Answer:irs a

Explanation:

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4 years ago

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