PHYSICS HIGH SCHOOL

How many neutrons does element X have if its atomic number is 38 and its mass number is 71?

Answers

Answer 1
Answer:

Answer:

The element has 33 neutrons

Explanation:

1. Find the mass number:

Mass number = number of protons + number of neutrons

Mass number = 71

2. Find the atomic number:

Atomic number = number of protons

Atomic number = 38

3. Find the number of neutrons:

Number of neutrons = Mass number - Atomic number

Number of neutrons = 71 - 38

Number of neutrons = 33
Answer 2
Answer: The nucleus of an atom has some protons and some neutrons in it.
The "mass number" is the total number of all particles in the nucleus. 
The "atomic number" is the number of protons in the nucleus.

Element X has 71 particles in the nucleus, and 38 of them are protons.
So (71-38) = 33 of them are neutrons.

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Which equation describes the sum of the two vectors plotted below?

Answers

Final answer:

The sum of two vectors A and B is a resultant vector R, where R = A + B. If vectors A and B are plotted with their tails at the origin and heads at points (x1, y1) and (x2, y2), respectively, the resultant vector R ends at point (x1+x2, y1+y2). This represents the sum of the individual components of vectors A and B.

Explanation:

In vector addition, the equation for the sum of two vectors A and B can be generally represented as R = A + B, where R is the resultant vector. If the vectors are plotted with their tails at the origin and their heads ending at points (x1, y1) for Vector A and (x2, y2) for Vector B, the resultant vector, R, will end at the point (x1+x2, y1+y2). In other words, the components of the resultant vector are simply the sum of the components of the original vectors.

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Answer:

R=-x-4y

Explanation:

Because i said so

How many nitrogen atoms are in one molecule of (NH4)2SO4?

Answers

15 nitrogen atoms are in one molecule

Final answer:

In one molecule of (NH4)2SO4 or ammonium sulfate, there are two nitrogen atoms.

Explanation:

The molecule (NH4)2SO4 is known as ammonium sulfate. This molecule is composed of two ammonium ions (NH4) and one sulfate ion (SO4). The ammonium ion consists of one nitrogen atom (N) and four hydrogen atoms (H). Because the formula indicates there are two ammonium ions (as shown by the subscript '2'), this means the overall molecule of ammonium sulfate contains two nitrogen atoms.

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how can the temperature of a substance remain the same even if the substance is absorbing thermal engergy

Answers

Temperature remains constant despite the application of thermal energy because phase change does not occur within the substance. To put it simply, here’s an example: You are drinking an orange juice outside and you decided to grab some ice to cool your juice. The mixture then turns into half ice and half juice with a temperature of exactly 0 degrees. But as you hold your glass, the ice begins to melt but the contents of the glass don’t change temperature. This happens because the thermal energy going into the glass come from the gas outside of the air which is the reason why the ice is melting causing the mixture not to warm up but do the opposite.

According to Faraday's law, voltage cannot be changed by changing the magnetic field strength.

Answers

The statement ‘According to Faraday's law, voltage cannot be changed by changing the magnetic field strength’ is false. No matter how the change is created, voltage will always be produced and it could be the magnetic field strength, moving magnet toward or away from the coil etc. This is because the voltage is directly proportional to the number of turns and the magnetic flux. 

Which avtivties belongs on top of physical activity pyramid

Answers

Weightlifting,Gymnastics....
the activity that belongs on top of the physical activity pyramid is sprinting

What is air pressure?

Answers

Air pressure is the amount of molecules in the air. For example, the higher you go in Earth's atmosphere the less pressure so less molecules. 
Air pressure also varies over time, and these temporal differences are usually caused by the temperature of the air. Cool air is denser (heavier) than warm air. Warm air is less dense (lighter) than cool air and will therefore rise above it. Areas of high pressure can be caused when cool air is sinking and pressing on the ground. At this time, the weather is usually dry and clear. In contrast, when warm air rises, it causes a region of low pressure. With low pressure, the weather is often wet and cloudy.
Air pressure varies over time and from place to place. If we travel up a mountain or go up in a hot air balloon, for example, the air pressure gets less the higher we go. We can explain this difference by comparing air pressure to a pile of blankets on your bed.
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