What are electromagnetic waves and how do they travel?

Physics

1 answer:

True [87]3 years ago

5 0

Answer:

Propagation of an Electromagnetic Wave. Electromagnetic waves are waves which can travel through the vacuum of outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.

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A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms-2, the power expended

Setler79 [48]

The power expended is 500 W

Explanation:

First of all, we start by calculating the work done by the man in order to ascend: this is equal to the gravitational potential energy gained by the man, which is

$W=mg\Delta h$

where

m = 50 kg is the mass of the man

$g=10 m/s^2$ is the acceleration of gravity

$\Delta h = 5 m$ is the change in height

Substituting,

$W=(50)(10)(5)=2500 J$

Now we can calculate the power expended, which is given by

$P=\frac{W}{t}$

where

W = 2500 J is the work done

t = 5 s is the time elapsed

Substituting, we find

$P=\frac{2500}{5}=500 W$

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A series of processes on Earth’s surface and in the crust and mantle that slowly change rocks from one kind to another is called

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This is the change in velocity over the the time elaspear

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4 years ago

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When a small object is launched from the surface of a fictitious planet with a speed of 52.9 m/s, its final speed when it is ver

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Answer:

The escape speed of the planet is 41.29 m/s.