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3 years ago

What is the main difference between direct and alternating current

Physics

1 answer:

Dmitriy789 [7]3 years ago

8 0

Answer:

» Direct current only flows in one direction with out reversing whereas alternating current flows in a sinusoidal wave form and reverse its direction of flow.

Explanation:

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Which of the following best defines speed? (3 points) a It is an object's speed at a specific point in time. b It is the distanc

djverab [1.8K]

Answer:

Explanation:

they are all almost correct.

c is the only fully correct option

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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

3 years ago

Which of the following is the FINAL step in a forecasting system?

Lelechka [254]

Answer:

gather the data needed to make the forecast

3 0

3 years ago

Pls answer B And C Will Mark Brainlist. And 30 Points. :)

Vika [28.1K]

Answer:

use the formula for option B ( d/t = s )

and

look at the graph representation to explain

5 0

3 years ago

How many hydrogen atoms are in a water molecule?

earnstyle [38]

The subscript after the element indicates the number of atoms of that element in the molecule. So, in H20, the subscript after the H, which stands for hydrogen, is 2. This means that there are 2 hydrogen atoms in a water molecule.

Hope this helps! :)

4 0

3 years ago