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2 years ago

Help asap please! what happens when electromagnetic waves go through a medium?

Physics

1 answer:

lesya [120]2 years ago

8 0

Answer:

The mechanism of energy transport through a medium involves the absorption and reemission of the wave energy by the atoms of the material. When an electromagnetic wave impinges upon the atoms of a material, the energy of that wave is absorbed.

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An air conditioner of 2kW is used in an electric circuit having a fuse of 10A rating. If the potential difference of the supply

Mrac [35]

Answer: Yes the fuse will be able ti withstand ,when the air conditioner is switched on.

Explanation:

Power of air conditioner = 2 kW = 2000 W (1000 W=1kW)

Potential difference applied = V = 220 V

Fuse rating of the air conditioner = 10 A

Current used by the air conditioner = ?

$power=current\times voltage= I\times V$

$I=\frac{2000 W}{220 V}=9.1 A$

10 A > 9.1 A ,Yes the fuse will be able ti withstand ,when the air conditioner is switched on.

6 0

3 years ago

Read 2 more answers

Select the correct answer.

love history [14]

Answer:

Explanation:

Givens

d = 100 meters plus the depth of the well

d = 100 + x where x is the depth of the well.

vi = 0 m/s The object is dropped. It was not thrown.

t = 5 seconds

a = 9.81 m/s^2

formula

d = vi*t + 1/2 a t^2

solution

100 + x = 0 + 1/2 * 9.81 * 5^2

100 + x = 122.625 Subtract 100 from both sides

x = 122.625 - 100

x = 22.6 m

The well is 22.6 meters deep.

5 0

3 years ago

A 2.40 kg snowball is fired from a cliff 7.69 m high. The snowball's initial velocity is 13.0 m/s, directed 49.0° above the hori

Crazy boy [7]

Answer:

a) W = 180.87 J , b) ΔU = -180.87 J , c) ΔU = -180.87 J

Explanation:

a) Work is defined as

W = F .ds

Where bold indicates vectors, we can write the scalar product

W = F s cos θ

Where the angle is between force and displacement.

The force of gravity is the weight of the body, which is directed downwards and the displacement thickens the tip of the cliff at the bottom, so that it is directed downwards, therefore the angle is zero degrees

W = $F_{g}$ y

W = m g y

For this problem we must fix a reference system, from the statement it is established that the system is placed at the base of the cliff, so that final height is zero and the initial height (y₀ = 7.69m)

W = 2.40 9.8 (7.69-0)

W = 180.87 J

b) The potential energy is

U = mg y

The change in potential energy,

ΔU = $U_{f}$ - U₀

ΔU = mg ( $y_{f}$ - y₀)

ΔU = 2.4 9.8 (0 -7.69)

ΔU = -180.87 J

c) in this case we change the reference system to the height of the cliffs, for this configuration

y₀ = 0

$y_{f}$ = -7.69 m

ΔU = 2.4 9.8 (-7.69 -0)

ΔU = -180.87 J

3 0

3 years ago

describe how the volume of a floating object such as a cork can be found.fully describe please step by step.

Rama09 [41]

Answer:

Explanation:

Use Archimedes' principle, that states something of this nature: "The buoyant force acting on an object immersed in a fluid is equal to the weight of the fluid displaced"

Say, you take a cube of wood(for example) and place it in a bucket of water. Your cube is bound to sink, until, the upthrust force equals its weight.

Where does this upthrust come from?

As the cube sinks, it displaced some volume of water(if the bucket were full you would see water pouring out)

Archimedes simply stated that: Upthrust,

U=mg

Example: One way to measure the volume of any irregular object (in your case, a stone) is to submerge it completely under water and measure the change in the height of the water level. This change in the water level (let's say it goes from 50 mL to 65 mL) indicates that the stone has a volume of 15 mL.
Example:Subtract the first volume from the second volume to calculate the volume of the stone. For example, if you recorded 40 fluid ounces the first time, and 50 fluid ounces the second time, the stone volume is 10 fluid ounces.

7 0

3 years ago

A shopper pushes a 5.32 kg grocery cart

Juli2301 [7.4K]

Answer:

$\text { acceleration of the cart is } 10.94 \mathrm{m} / \mathrm{s}^{2}$

Explanation:

According to “Newton's second law”

“Force” is “mass” times “acceleration”, or F = m× a. This means an object with a larger mass needs a stronger force to be moved along at the same acceleration as an object with a small mass

Force = mass × acceleration

$\text { Acceleration }=\frac{\text { force }}{\text { mass }}$

Given that,

Mass = 5.32 kg

$\text { Force }=12.7 \mathrm{N} \text { forces at }-28.7^{\circ}$

$x=-28.7^{\circ}$

F = 12.7N

Normal force = mg + F sinx,

“m” being the object's "mass",

“g” being the "acceleration of gravity",

“x” being the "angle of the cart"

$\mathrm{g}=9.8 \mathrm{m} / \mathrm{s}^{2}\text { (g is referred to as the acceleration of gravity. Its value is } 9.8 \mathrm{m} / \mathrm{s}^ 2 \text { on Earth })$