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3 years ago

What does the atomic number tell us about an atom of a certain element?

Physics

1 answer:

Setler79 [48]3 years ago

4 0

It tells us the number of protons that are present in the nucleus, the positively charged region of that atom.

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Where else could Snell’s law be useful in determining the path of a light ray in your everyday life?

Musya8 [376]

Answer:

Contact glasses.

Explanation:

-Anytime you put on a pair of glasses, or see light bend through a glass of water or a prism, this rule is in action.

-In short, Snell's law governs the angle by which electromagnetic radiation such as light refracts, or changes direction, as it passes from one material to another and slows down.

6 0

3 years ago

Una locomotiva traina un solo vagone, che ha la sua stessa massa, con la forza di

gregori [183]

Answer:

c) F = 16000 N

Explanation:

For this exercise we use Newton's second law

F = ma

they tell us that adding the other wagons the acceleration of the locomotive must be maintained

F = m a

by adding the other four wagons

mass = 4 no

therefore to maintain the force you must also raise the same factor

Fe = 4Fo

Fe = 4 4000

F = 16000 N

3 0

3 years ago

A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.

AleksandrR [38]

(B) The balloon will rise because the upward buoyant force is greater than its weight.

Explanation:

In order to evaluate what happens to the balloon, we need to compare the magnitude of the two forces acting on the balloon:

- Its weight, W, acting downward

- The buoyant force, B, acting upward

The weight of the balloon is given by:

$W=mg$

where

m = 2.0 kg is the mass of the balloon

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$W=(2.0)(9.8)=19.6 N$

The buoyant force on the balloon is given by:

$B=\rho V g$

where

$\rho = 1.3 kg/m^3$ is the air density

$V=5.0 m^3$ is the balloon's volume

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$B=(1.3)(5.0)(9.8)=63.7 N$

We observe that the buoyant force B is larger than the weight, so the balloon will accelerate upward, and the correct answer is

(B) The balloon will rise because the upward buoyant force is greater than its weight.

#LearnwithBrainly

3 0

2 years ago

Which type of fitness is not based on performance?

Aneli [31]

Fitness can be measured during the actual performance.
Which means that there are a lot of factors that can affect agility, speed, and coordination beside the physical factors itself. Meanwhile, flexibility solely depends on the physical Factors.

The answer is flexibility .

Hope this helps (:

4 0

3 years ago

A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed v0. At the same time, a s

liraira [26]

Without air resistance, both balls reach the ground at the same instant.

Neither horizontal motion nor weight affects vertical motion.

6 0

3 years ago