Which device transforms electrical energy to mechanical energy?

Which statement accurately describes the relationship between air pressure, air density, or altitude?

8_murik_8 [283]

Answer:

The answer is: dense air exerts more pressure than less dense air.

Pressure is due to the weight of the above column of the substance which is a force resulting from its weight that is the product of its mass and gravitational pull. The denser the air and the grater the column, the larger its mass and hence the more the pressure it exerts.

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Explanation:

8 0

4 years ago

Read 2 more answers

What exercise will strengthen your legs?

Olin [163]

Answer: Squats and leg lifts

Explanation:

They strengthen your legs!

7 0

3 years ago

Sam is getting ready to go to bat in his first major league baseball game. He wants to lower his stress level just before battin

Lina20 [59]

he will be good and surprise

3 0

4 years ago

1. Compare and contrast the two kinds of waves.

max2010maxim [7]

Answer:

Look at the diagrams for 2 and 3.

Explanation:

1. There are two ways to categorize waves.

Direction of particles of the wave:

If you need to differentiate them based on direction of particles of the waves then you have either longitudinal or transverse.

Particles of the medium of longitudinal waves move parallel to the direction or movement of the wave. On the other hand, transverse waves are waves where the particles of the medium it travels through move perpendicular to the motion of the wave.

Ability to transmit energy through a medium or vacuum

You have the mechanical wave and the electromagenetic wave (em wave).

The main difference between these two is that mechanical waves travel through a medium. Basically, they need the molecules in the medium, which collide or bump into each other to pass on the energy. An example would be sound waves.

Electromagnetic waves differ because they do not need a medium. They can travel through a vacuum. Like light waves.

2.

Crest - It is the displacement of a wave in the upwards direction. In short it is the peak or the highest point of a wave.

Trough - It is the opposite of the crest, so it is the displacement of a wave going downwards. To put it shortly, it is the depth or lowest point of a wave.

If you will get the distance between the crest and trough, you will see that it is twice the measure of the amplitude, which you will be defined later on.

Wavelength - is the distance between two crests or two troughs of two consecutive waves. It is measured in meters and goes with the direction of the wave.

Amplitude - height or depth of the crest or trough from the rest position. It is also measured in meters. It is defined as the displacement of the wave from the rest position or point.

Look at image B, to see the different parts.

3.

Standing waves are waves that vibrate vertically and have the same frequency and amplitude.

Nodes are points in the wave where the amplitude is equal to zero or at their resting point. Antinodes are points in the wave where the amplitudes are at their maximum.

Look at image C.

6 0

3 years ago

It is proposed that a spaceship might be propelled in the solar system by radiation pressure, using a large sail made of foil. W

Anvisha [2.4K]

Answer:

962291.57928 m²

Explanation:

$P_r$ = Pressure = $2\dfrac{I}{c}$ (full reflection)

I = Intensity = $\dfrac{P}{A}=\dfrac{P}{4\pi r^2}$

P = Power = $3.9\times 10^{26}\ W$

c = Speed of light = $3\times 10^8\ m/s$

M = Mass of Sun = $1.99\times 10^{30}\ kg$

m = Mass of ship = 1500 kg

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

Force of radiation is given by

$F_r=P_rA\\\Rightarrow F_r=2\dfrac{I}{c}\times A\\\Rightarrow F_r=2\dfrac{P}{4\pi r^2c} A$

This force will balance the gravitational force as stated in the question

$\dfrac{GMm}{r^2}=2\dfrac{P}{4\pi r^2c} A\\\Rightarrow A=\dfrac{4\pi cGMm}{2P}\\\Rightarrow A=\dfrac{4\times \pi\times 3\times 10^8\times 6.67\times 10^{-11}\times 1.99\times 10^{30}\times 1500}{2\times 3.9\times 10^{26}}\\\Rightarrow A=962291.57928\ m^2$

The area of the must be 962291.57928 m²

3 0

4 years ago