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3 years ago

Mains electricity is an ac supply. Explain the difference between direct and alternating potential difference.

1 answer:

5 0

Direct current (DC) is the flow of electric charge in only one direction. It is the steady state of a constant-voltage circuit. Most well-known applications, however, use a time-varying voltage source. Alternating current (AC) is the flow of electric charge that periodically reverses direction.

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What two quantities affect the force of attraction between two charges

miss Akunina [59]

1. the amount of electric charge that they carried
2. the distance between them

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3 years ago

Read 2 more answers

The water in the plumbing in a house is at a gauge pressure of 300,000 pa. What force does this cause on the top of the tank ins

liraira [26]

Answer:

60 000 N

Explanation:

1 pa = 1 N/m^2

you have 300 000 of these = 300 000 N /m^2

but only an area of .2 m^2

300 000 N / m^2 * .2 m^2 = 60 000 N

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2 years ago

We are sending a 30 Mbit file from source host A to destination host B. All links in the path between source and destination hav

Dmitrij [34]

Answer:

$t=1.5\times 10^{-4}\ s$

Explanation:

Given:

file size to be transmitted, $D=30\ Mb$

transmission rate of data, $\dot D=10\ Mb.s^{-1}$

propagation speed, $v=2\times 10^8\ m.s^{-1}$

distance of data transfer, $s=10000\ km=10^4\ m$

Now the delay in data transfer from source to destination for each 10 Mb:

$t'=\frac{s}{v}$

$t'=\frac{10^4}{2\times 10^8}$

$t'=5\times 10^{-5}\ s$

Now this time is taken for each 10 Mb of data transfer and we have 30 Mb to transfer:

So,

$t=3\times t'$

$t=3\times 5\times 10^{-5}$

$t=1.5\times 10^{-4}\ s$

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4 years ago

National Instant Criminal Background Check System is used for a person trying to access a government website.

Paladinen [302]

The given statement "National Instant Criminal Background Check System is used for a person trying to access a government website" is false.

Answer: Option B

Explanation:

The National Instant Criminal Background Check System, additionally referred to as NICS, is meant to spot individuals prohibited underneath federal law from getting firearms from a licence dealer. However, there area unit several loopholes within the system.

This modification higher permits the news of the identities of prohibited individuals to the background check system and could be a important step toward up the public’s safety whereas continued to powerfully shield individuals’ privacy interests.

4 0

4 years ago

If you press a rubber puller on a rough surface, it does not stick to the surface. why?

serious [3.7K]

Answer:

The remaining air between the cup and the rough surface exert pressure on the inner wall of the cup, due to this it does not stick on the rough surface.

Explanation:

HOPE it helps:))))

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3 years ago