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3 years ago

An elements atomic number is 30. How many protons would an atom of this element have?

Physics

2 answers:

iris [78.8K]3 years ago

6 0

The atomic number is the number of protons. If the atomic number is 30, then the atom will have 30 protons.

Romashka-Z-Leto [24]3 years ago

5 0

Hi ;)
First of all, The number of protons is always equal to the number of electrons in a neutral atom.Since we have 30 protons and 30 electrons ,the positive charge on the proton is cancelled by the negative charge on the electron leaving a neutral atom.

Positive 30 and negative 30 equals 0.

Therefore , that atom would have 30 protons .

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A person who weighs 69kg rides with an acceleration of +1.45 m/s2. What is the force exerted by the legs on the person's upper b

trapecia [35]

Answer:

The force exerted by the legs on the person's upper body 32.106 N.

Given:

Mass = 69 kg

Acceleration = 1.45 $\frac{m}{s^{2} }$

To find:

Force exerted by legs on the person's upper body = ?

Formula used:

Force = mass × acceleration

Solution:

Mass of legs = $\frac{32}{100}$ mass of body

Mass of legs = 22.08 kg

According to Newton's second law of motion,

Force = mass × acceleration

Force = 22.08 × 1.45

Force = 32.106 N

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4 years ago

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katrin2010 [14]

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So here we know that the formula of centripetal acceleration is given by

$a_c = \frac{v^2}{R}$

so here we know that

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$v = 30.9 m/s$

now we will plug in all values

$9.8 = \frac{30.9^2}{R}$

$R = \frac{30.9^2}{9.8}$

$R = 97.43 m$

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4 0

3 years ago

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Lostsunrise [7]

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3 years ago

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katrin2010 [14]

Answer:

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Explanation:

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To find the efficiency;

$Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100$

Substituting into the equation, we have;

$Efficiency = \frac {440}{570} * 100$

$Efficiency = 0.7719 * 100$

Efficiency = 77.19 ≈ 77%

Therefore, the efficiency of the engine is 77 percent.

7 0

3 years ago

Now, remove the positive charge by dragging it back to the basket, and drag one negative charge toward the middle of the screen.

Elza [17]

Answer:

The correct option is;

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That is there is a electric field reversal or a change electric field direction.

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3 years ago