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prohojiy [21]
3 years ago
9

(BRAINLIEST) Question: Name 2 waves that you use in your everyday life.

Physics
1 answer:
Archy [21]3 years ago
8 0

-- Radio waves.  (To hear the weather while I'm waking up.)

-- Light waves.  (To see where the dog is so I don't step on him.)

-- Infrared waves. (To make my toast for breakfast.)

-- Microwaves.  (To heat my oatmeal for breakfast.  Also when I go in to my job as a microwave communications engineer.)

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A 4 kW vacuum cleaner is powered by an electric motor whose efficiency is 90%. (Note that the electric motor delivers 4 W of net
RoseWind [281]

Answer:3.6\ kW

Explanation:

Given

Power Supplied [tex]P_{input}=4\ kW[/tex]

Efficiency of the motor \neta =90\%

and \neta =\dfrac{\text{Power output}}{\text{Power input}}

\Rightarrow 0.9=\dfrac{P_{out}}{4}

\Rightarrow P=0.9\times 4

\Rightarrow P=3.6\ kW

So, vacuum cleaner delivers a power of 3.6\ kW

3 0
2 years ago
3. What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
bonufazy [111]

Explanation:

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3 0
3 years ago
The energy produced by the internal motion of atoms? electrical , thermal, chemical, nuclear
alekssr [168]

Answer:

Thermal energy, or heat, is the energy that comes from the movement of atoms and molecules in a substance. Heat increases when these particles move faster. Geothermal energy is the thermal energy in the earth. Motion energy is energy stored in the movement of objects. so the answer is thermal energy

6 0
2 years ago
Of the following, which is the best reason for why a woman's risk for cardiovascular disease increases after menopause?
MatroZZZ [7]

Answer:

The best reason for the increased risk of cardiovascular diseases in women after menopause is the significant decrease in the levels of Estrogen in the body.

Detailed answer:

  • Due to the approach of menopause the estrogen levels in the blood decrease drastically.
  • Estrogen helps in relaxing the vessels and keeping them in their natural diameter.
  • But due to a drastic decrease in its level due to menopause, there is a high chance of cholesterol building up on the walls of the artery in the heart, which can cause many cardiovascular diseases.

6 0
2 years ago
On his fishing trip Justin takes the boat 25 km south. The fish aren’t biting so he goes 10 km west. He follows a school of fish
S_A_V [24]

Distance is 50 km

Displacement is 10 km

<u>Explanation:</u>

Given:

Distance toward south, x = 25 km

Distance towards west, y = 10 km

Distance towards north, z = 15 km

(a) Total distance, D = ?

Total distance, D = x + y + z

                       D = 25 + 10 + 15

                       D = 50km

(b) Displacement, d = ?

Displacement = final position - initial position

                      = 10 - 0 km

                      = 10km

8 0
2 years ago
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