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3 years ago

You can send your pictureand type the answer to the questions

Physics

1 answer:

Snowcat [4.5K]3 years ago

3 0

The answer is B because I took the test and had the question

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12. Suppose a person is covered head to foot by wool clothing with average thickness of 2.00 cm and is transferring energy by co

Vikki [24]

27 degrees because yea ik the answer

7 0

2 years ago

An atom an atomic number of 12 and a mass number of 25 can be best described as

katen-ka-za [31]

Neutral Magnesium atom

Explanation:

From the given description of the atom, one can infer that this atom is a neutral atom.

In a neutral atom, the number of protons and neutrons are the same.

Atomic number = 12

Mass number = 25

This atom is Magnesium.

Magnesium has an atomic number of 12 from the periodic table.

Number of protons = 12 = atomic number

Number of electrons = 12(for neutral atoms, atomic number is same as number of electrons).

Number of neutrons = mass number - atomic number = 25-12 = 13.

Learn more:

Atomic number brainly.com/question/5425825

#learnwithBrainly

4 0

3 years ago

An electron (charge −e=−1.60×10−19C−e=−1.60×10−19C) is at rest at a distance 1.00×10−10 m 1.00×10−10m from the center of a nucle

shtirl [24]

Answer:

$-9.45\times10^{-16} \text{ J}$

Explanation:

According to Coulomb's law, the force of attraction between two point charges, $q_1$ and $q_2$ , separated by a distance $d$ is given by

$F = k\dfrac{q_1q_2}{d^2}$

$k$ is a constant with a value of $9\times10^9\text{ F/m}$ .

When we substitute the values from the question,

$F = (9\times10^9\text{ F/m})\dfrac{(-1.60\times10^{-19} \text{ C})\times(+1.31\times10^{-17}\text{ C})}{(1.00\times10^{-10}\text{ m})^2} = -1.89\times10^{-6} \text{ N}$

This value is negative because it is in a direction towards the positive charge.

The work done in moving the electron from the nucleus is

$W = F\times r$

$W = (-1.89\times 10^{-6} \text{ N})\times(5.00\times10^{-10}\text{ m}) = -9.45\times10^{-16} \text{ J}$

This is negative because work is done on the electron, not by it.

3 0

3 years ago

A 20kg metal block is placed on a horizontal surface. The block just begins to slide when horizontal force of 100N is applied to

guajiro [1.7K]

Answer:

See the photo

Explanation:

I can't do the exercise a because you need the Fs to calculate the coefficient of static friction.

4 0

3 years ago

Lily took 6 hours to complete a journey at an average speed of 58 km/h. For the first 4 hours, she travelled at an average speed

arlik [135]

Answer:

92km

Explanation:

Given parameters:

Duration of the journey = 6hrs

Average speed = 58km/hr

Now, let us find the total distance of the journey;

Distance = Speed x time

Distance = 58 x 6 = 348km

So;

Average speed for the first 4hrs = 64km/hr

Time = 4hrs

Distance = 64 x 4 = 256km

For the rest of the journey, the student will cover;

= 348km - 256km

= 92km

8 0

3 years ago