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2 years ago

Which item is not considered electromagnetic energy?

1 answer:

5 0

Sound waves are known to be the one that's not considered as a type of electromagnetic energy. As for microwaves and x-rays, they tend to share the same frequencies that can be considered as electromagnetic, and sound waves have a different frequency than them.

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Every object that has mass attracts every other object with a gravitational force. It has been proven that the size of the gravi

Blababa [14]

Newton's law of universal gravitation

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2 years ago

Read 2 more answers

Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he p

lapo4ka [179]

Answer:

He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

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2 years ago

A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end just bef

stich3 [128]

Answer:

v = 7.67 m/s for L= 1m

Explanation:

Let's use the conservation of mechanical energy, at the highest point and the lowest point

Initial. Vertical ruler

Em₀ = mg h

Final. Just before touching the floor

$Em_{f}$ = K = ½ I w²

Em₀ = $Em_{f}$

m g h = ½ I w²

The moment of inertia of a ruler that turns on one end is

I = 1/3 m L²

Let's replace

m g h = ½ (1/3 m L²) w²2

g h = 1/6 L² w²

They ask for the speed of the end so the height h is equal to the length of the ruler

g L = 1/6 L² w²

The linear and angular variables are related

v = w r

w = v / r

In this case the point of interest a in strangers r = L

g L = 1/6 L² v² / L²

v = √ 6 g L

Let's calculate

Assume that the length of the meter is L = 1 m

v = √ (6 9.8 1)

v = 7.67 m/s

7 0

2 years ago

If the cyclist has 2000 j of potential energy at point c how high is the hill

fgiga [73]

That's really going to depend on ...

-- where point-c is

and

-- the cyclist's mass

and

-- the acceleration of gravity on the planet where the hill is

5 0

2 years ago

The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of Q is located at one of the corn

tester [92]

Answer:

12.0 V

Explanation:

Data :

Potential difference due to a single charge (+Q), E = 3.0 V

The Electric potential for the system of charges is given as:

$E=\frac{1}{4\pi \epsilon_o}[\Sigma\frac{Q}{r}]$

for single charge, E = 3.0 V = $\frac{1}{4\pi \epsilon_o}[\frac{Q}{r}]$ ->eq(1)

And for 4 charges:

$E=\frac{1}{4\pi \epsilon_o}[4\frac{Q}{r}]$ -eq(2)

from eq(1) and (2) we have

E = 4 × 3.0 V = 12 V

5 0

2 years ago