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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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A 30 kg dog runs at a speed of 15<br> What is the dog's kinetic energy?

sattari [20]

Ke= 1/2 mv ^ 2
15x 15 = 225
225 x 30 = 6750
6750/2 = 3375 J
Ke = 3375 J

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2 years ago

A uniform meter stick (with a length of 1.00 meter) has a mass of 108 g. It is supported at its midpoint by a vertical rigid blu

alexandr1967 [171]

Answer:4

Explanation:

Given

$m_1=21\ gm$

$m_2=27\ gm$

Mass of stick is $m=108\ gm$

Let T be the tension in the red string

Now if the red string is cut , suppose T is the tension in the blue rod immediately after cut

Therefore

$T=m_1g+m_2g$

$T=(0.021+0.027)\times 10$

$T=0.48\ N$

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3 years ago

The motor in a refrigerator has a power output of 400 W. If the freezing compartment is at 273 K and the outside air is at 306 K

Aleksandr [31]

Answer:15,883.63 KJ

Explanation:

Given

Power=400 W

Freezing compartment temperature is 273 K $(T_L)$

Outside air Temperature=306 K $(T_H)$

Time =80 minutes

Energy Required to deliver 400 w power in 80 minutes

E=1920 KJ

and we know COP of refrigerator is given by

$COP=\frac{T_L}{T_H-T_L}$ $=\frac{Desired\ effect}{Work}$

$\frac{273}{306-273}=\frac{D.E.}{1920}$

$D.E.=8.27\times 1920=15883.63 KJ$

Therefore 15,883.63 KJ is removed in 80 minutes

7 0

3 years ago

A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark. It does this in 3 seconds. What is the speed? What is

ad-work [718]

Answer:

Explanation:

In the calculation of distance we do not take into account the direction of movement .So only magnitude of movement is taken care of.

On the other hand , in respect of displacement , we take into account even direction of movement along with magnitude.

Distance covered by flea = 45 - 27 = 18 cm

Displacement by flea = 27 - 45 = - 18 cm

Speed = Distance covered / time

= 18 / 3 = 6 cm / s

Velocity = - 18 / 3 = - 6 cm /s.

3 0

3 years ago

. A water balloon is thrown horizontally at a speed of 2.00 m/s from the roof of a building that is 6.00m above the ground. At t

dedylja [7]

Answer:

Explanation:

Height of building

H = 6m

Horizontal speed of first balloon

U1x = 2m/s

Second ballot is thrown straight downward at a speed of

U2y = 2m/s

Time each gallon hits the ground

Balloon 1.

Using equation of free fall

H = Uoy•t + ½gt²

Uox = 0 since the body does not have vertical component of velocity

6 = ½ × 9.8t²

6 = 4.9t²

t² = 6 / 4.9

t² = 1.224

t = √1.224

t = 1.11 seconds

For second balloon

H = Uoy•t + ½gt²

6 = 2t + ½ × 9.8t²

6 = 2t + 4.9t²

4.9t² + 2t —6 = 0

Using formula method to solve the quadratic equation

Check attachment

From the solution we see that,

t = 0.9211 and t = -1.329

We will discard the negative value of time since time can't be negative here

So the second balloon get to the ground after t ≈ 0.92 seconds

Conclusion

The water ballon that was thrown straight down at 2.00 m/s hits the ground first by 1.11 s - 0.92s = 0.19 s.

4 0

3 years ago

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