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3 years ago

Calculate the mass number of an atom with 8 protons, 12 neutrons and 10 electrons

Physics

1 answer:

Radda [10]3 years ago

7 0

Answer: 20

Explanation: Mass number is the number of neutrons plus the number of protons. 8 + 12 gives 20.

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An object increases vert its velocity from 22M/S 236M/S and five seconds. What is the acceleration of the object

MariettaO [177]

Answer:

$\boxed {\boxed {\sf a=42.8 \ m/s^2}}$

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

$a=\frac{v-u}{t}$ (<em>v </em>is the final velocity, <em>u</em> is the initial velocity, <em>t </em>is the time).

The velocity increased from 22 m/s to 236 m/s in 5 seconds. Therefore:

$v=236 \ m/s\\u=22 \ m/s\\t= 5 \ s$

Substitute the values into the formula.

$a=\frac{236 \ m/s - 22 \ m/s}{5 \ s}$

Subtract in the numerator.

236 m/s-22 m/s=214 m/s

$a=\frac{214 \ m/s}{5 \ s}$

Divide.

$a=42.8 \ m/s^2$

The acceleration of the object is <u>42.8 meters per square second.</u>

6 0

3 years ago

While riding a chairlift, a 55-kilogram skier is raised a vertical distance of 370 meters. What is the total change in the skier

Lelechka [254]

The change in the skier's gravitational potential energy is 199430 J.

<h3> Gravitational potential energy:</h3>

This is the energy of a body due to its position in a gravitational field. The S.I unit of gravitational potential energy is Joules (J)

The Change in the skier's gravitational potential energy can be calculated using the formula below.

Formula:

ΔP.E = mg(Δh)............... Equation 1

Where:

ΔP.E = Change in the skier's potential energy
m = mass of the skier
Δh = change in height to which it was raised
g = acceleration due to gravity.

From the question,

Given:

m = 55 kg
Δh = 370 m

g = 9.8 m/s²

Substitute these values into equation 1

ΔP.E = 55×370×9.8
ΔP.E = 199430 J.

Hence, The change in the skier's gravitational potential energy is 199430 J.

Learn more about potential energy here: brainly.com/question/1242059

3 0

2 years ago

A snail slowly travels down the sidewalk at a pace of 4 cm/s. how long will it take the snail to reach a distance of 20 cm?

egoroff_w [7]

It’s gonna take it 5 cm to reach the distance

8 0

3 years ago

Which term describes the number of thoughs that pass a point in a given amount of time

NeX [460]

The term that describes the number of thoughs that pass a point in a given amount of time is FREQUENCY.

In wave theory, frequency refers to the number of wave that pass through a fixed point in a given amount of time. Frequency is usually measure in Hertz. The mathematical formula for finding frequency is:

F = Velocity of wave / wavelength of wave.

5 0

3 years ago

A hydrogen bond forms by the electrostatic interaction of opposite charges in two molecules. If

Darya [45]

The force between the molecules involved in the bond is 6. 426 *10^-11 Newton

<h3>How to determine the force</h3>

Using the formula:

F = K[q1 x q2]/D^2

where K is coulombs constant =9 *10 ^9 Nm^2/C^2.

q1 and q2 = charges = 1.60x10 -20C

d = distance between the charges = 2x10 -10 m

Substitute the values into the formula

F = $9 * 10^9\frac{ 1.60*10^ -20 * 1.60 *10^ -20}{2x10^ -10^{2} }$

F = $9 *10^9\frac{2. 856* 10^-40}{4* 10^-20}$

F = $9* 10^9 * 7. 14* 10^-21$

F = $6. 426 * 10^-11$ Newton

Thus, the force between the molecules involved in the bond is 6. 426 *10^-11 Newton

Learn more about electrostatic force here:

brainly.com/question/8424563

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5 0

2 years ago