PHYSICS HIGH SCHOOL

Question 9How many neutrons are in an atom of Mg-25?
O 11
O 12
O
13
O 31

Answers

Answer 1
Answer: They differ only because a 24Mg atom has 12 neutrons in its nucleus, a 25Mg atom has 13 neutrons, and a 26Mg has 14 neutrons. Figure 2.3.
Answer 2
Answer:

Answer:

number of neutrons = 13.

Explanation:

Each element is uniquely and completely identified by its Atomic Number. This is the number of protons in the nucleus, which is equal to the number of electrons in the neutral atom.The Atomic Number of Magnesium is 12.An atom’s Mass Number is the number of protons plus the number of neutrons in its nucleus.For Mg-25 the Mass Number is 25.So 25 = (number of protons) + (number of neutrons)= 12 + (number of neutrons)

Related Questions

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A man’s mass is 100 pounds on Earth. His weight is 445N. What would change if this man were on the moon? A) His mass
B) His weight
C) His weight and mass
D) Neither the mass or the weight

Answers

Answer: B) weight

Explanation: Your mass does not change on the moon

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Answers

If you apply 100.0 N of force to lift an object with a single, fixed pulley, then the resistive force is also equivalent to 100 Newtons of force. Since the weight of the object was not mentioned, it is assumed that it has already been taken into account in the 100 N value of force. This follows Newton's law of motion of equal action and reaction.

One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E=mc2,
where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following?

Answers

Answer:

Unit of energy is kg-m/s or Joules.

Explanation:

The mass- energy relationship in physics is given by :

E=mc^2

Where

m is the mass of the object

c is the speed of light

The SI unit of m is kilogram while the SI unit of c is as same as speed of light i.e. m/s. So, the unit of energy is kg-m/s. It is also equivalent to Joules.

So, the SI unit of energy is kg-m/s or Joules. Hence, this is the required solution.
Joule is the si unit for energy

Air pressure is gravity pulling down on air molecules.
a. True
b. False

Answers

Air pressure is gravity pulling down on air molecules. Like us,air has also mass and the pressure is brought down by the earth’s gravitycausing an increase in weight exerted on you as you descend lower into theatmosphere. So, as you enter into the other layers of atmosphere above the troposphere,the air pressure starts to decrease. Below the atmosphere is the hydrosphere. This iswhere all liquid forms are located. And since the seawater has a greater massthan air, it has the greatest pressure. The answer is true.

Answer:

true

Explanation:

A scientist noticed that a dark-colored peppered moth is more visible on a light-colored background than a light-colored peppered moth. He wonders, “Does this difference in visibility affect the survival rate of dark moths?” Which part of the scientific method does he need to carry out next?

Answers

Answer: Form a hypothesis

A scientific way to investigate a problem involves mainly five steps.

→A question or problem must be formulated in the first step.

→After gathering the background information, A hypothesis must be made.

→Third step would be to design an experiment.

→Fourth step would include collection and recording of data.

→Fifth step would include the conclusions drawn from the experiment and communication of hypothesis and its results.

When  the scientist notices that a dark colored peppered moth over light colored background, he formulates a question: whether the difference in visibility affects the survival rate of dark moths or not? Therefore, next step in the scientific method would be to gather more information on the subject and formulate a hypothesis.

Answer:

the correct simple answer is B

Explanation:

a coil has n turns enclosing an area of a. in a physics laboratory experiment, the coil is rotated during the time interval δt from a position in which the plane of each turn is perpendicular to earth's magnetic field to one in which the plane of each turn is parallel to the field. the magnitude of earth's magnetic field at the lab location is b.

Answers

The correct answer for the question that is being presented above is this one:

Phi = BAsin(theta) 
1. Phi(i) = BA 
2. Phi(f) = 0 
3. EMF = N(phi(i)-phi(f))/deltat

Here are the follow-up questions:

1. What is the total magnitude Phi_initial of the magnetic flux through the coil before it is rotated? 
2. What is the magnitude Phi_final of the total magnetic flux through the coil after it is rotated? 
3. What is the magnitude of the average emf induced in the coil?
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