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3 years ago

PLEASE HELP BRAINLIEST + POINTS'

Physics

1 answer:

Semenov [28]3 years ago

8 0

For this case we have that by definition, physical power refers to the amount of work done for a unit of time.

So:

$P = \frac {W} {t}$

Where:

W: It's the work

t: It's time

The power units are in $\frac {Joules} {s} = Watts$

So, according to the problem data we have:

$P = 100W\\t = 120s$

Clearing the work of the formula:

$W = P * t\\W = 100 * 120 = 1200$

Thus, the work is 1200 joules.

Answer:

Option C

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A window washer is standing on a scaffold supported by vertical ropes at each end. The scaffold weighs 200. N and is 3.00 m long

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Refer the given figure showing the arrangement.

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3 years ago

A proton is accelerated through a potential difference of 250V. It then enters a uniform magnetic field and moves in a circular

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Answer: a) 7.52 ×10^-4 T, b) 4.72×10^-7s

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qV =mv^2/2

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v = velocity of electron =?

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1.609×10^-19 × 250 ×2 = 9.11×10^-31 ×v^2

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By cancelling "v" on both sides of the equation, we have that

qB = mv/r

Where r = radius = 10cm = 0.1m

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B = (9.11 ×10^-31 × ×1.33×10^7)/ (0.1 ×1.609×10^-19)

B = 1.21×10^-23/ 1.609×10^-20

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v = ωr

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6 0

3 years ago

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