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3 years ago

Which device is most likely to operate on alternating current?

Physics

2 answers:

Ksenya-84 [330]3 years ago

6 0

Answer : The correct option is, (A) Refrigerator

Explanation :

There are two type of current which are direct current (DC) and alternating current (AC).

Direct current : In this, the electric current or charge flows in one direction only.

Alternating current : In this, the electric current or charge changes in periodical direction. It is used to supply power to houses, office building, etc.

From the given options, refrigerator device is most likely used to operate on alternating current.

While the other options, flashlight, remote control and cell phone is used to operate on direct current. In these devices, a battery is used which is a source of direct current.

Hence, the correct option is, (A) Refrigerator

aalyn [17]3 years ago

4 0

It is A. a refrigerator cause a alternating current is current that doesn't stop and the refrigerator is plug into the wall.

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Formulas in the solutions.

Nutka1998 [239]

Answer:

1) The Newton's law the Hulk is most closely demonstrating is the Third Law of motion

Newton's third law of motion states that action and reaction are equal and opposite.

2) The reason why the Newton's Law the Hulk is most closely demonstrating is the Newton's Third Law of Motion is that according to Newton's Third Law of motion, forces exist in pairs, the action of the Hulk when he leaps upward by pushing against the the Earth (which can be assumed stationary in relation to the Hulk), is equal to the reaction of the Earth, which moves down slightly, away from its initial position.

However, due to the large mass of the Earth, compared to the mass of the Hulk, the downward motion of the Earth due to the reaction force (equal to the force with which the Hulk leaps) is negligibly small, such that the Earth can absorb the Hulk's leap force by reacting mainly locally, at the leap point by forming a crater, while the Earth in general, remains in the same place

Explanation:

6 0

3 years ago

A solar cell that transforms 300 J of light energy into 45 J of electrical energy and 255 J of wasted energy. whats the efficien

Setler [38]

Answer:

15%

Explanation:

Step one:

Given data

Energy source= 300J

Useful energy = 45J

Waste energy = 255J

Required

The efficiency of the solar system

Step two:

The efficiency is computed by factoring only the useful work and the energy source

Efficiency= 45/300*100

Efficiency= 0.15*100

Efficiency= 15%

3 0

3 years ago

Ear "popping" is an unpleasant phenomenon sometimes experienced when a change in pressure occurs, for example,in an airplane. If

marshall27 [118]

Answer:

H = 0.00058m = 0.58mm of Mercury

h = 160m for popping at 8000m

Explanation:

Air density decreases with altitude (increasing height).

At sea level air density = 1.22kg/m^3

while at 3000m above it is approximately 0.8 kg/m^3

ASSUMPTION:

we neglect the change in density across 100m vertically

density of mercury = 13600kg/m ^3

we equate the pressure for mercury and air

AIR(pgh) = Mercury(pgh)

0.8 * g * 100 = 13600 * g * H

H = 0.00058m = 0.58mm of Mercury

At even farther heights, the air density further drops

at 8000m above it is 0.52kg/ m^3 (source:https://www.engineeringtoolbox.com/standard-atmosphere-d_604.html)

***for the ear to pop again, it has to experience same change in pressure as of at 3000m

Change in P for AIR at 3000m = Change in P for AIR at 8000m

ASSUMPTION : gravitational acceleration does not change with altitude

pgh = pgh

0.8 * g * 100 = .5 * g *h

h = 160m

3 0

4 years ago

Which of the following allows the human body to maintain stability in response to a viral infection

tiny-mole [99]

The spine is the one that keeps a huminss body mantaned

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3 years ago

I’m steel, the solvent is And the solute is. .

sleet_krkn [62]

Iron is the solvent and carbon is the solute.

8 0

3 years ago