PHYSICS HIGH SCHOOL

A neutral atom of uranium (U) has 146 neutrons and a mass number of 238. How many protons does it have?

Answers

Answer 1

Answer:

Answer:

Explanation:

One

I've never heard of a mass defect before you asked this question. Interesting concept.

Givens

Number of neutrons =207 - 82 = 125

Number of protons = 82

The amu of a proton is 1.00728

The amu of a neutron is 1.00866

Solution

Find out the actual mass of the Lead atom

Actual mass = 82*1.00728 + 125*1.00866

Actual mass = 208.67946

The mass defect = 208.67946 - 207 = 1.67946

That is the proper way to calculate mass defect.

Apparently the way you are supposed to do it is

Mass defect = 208.67946 - 206.975897= 1.703563 which means that C is the closest answer. You will have to look at your notes to see if amu for protons and neutrons are what I used.

Two

The number of protons is the number of Uranium on the periodic table.

92 protons. 92 comes from the position on the periodic table.

You can get the same thing by Taking its relative mass (238) and subtracting the neutrons (146) which is 238 - 146 = 92

Answer 2

Answer:

Answer:

92 protons

Explanation:

The mass number is 238, so the nucleus has 238 particles in total, including 146 neutrons. So to calculate the number of neutrons we have to subtract: 238 − 146 = 92

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A suspect is leading the police on a car chase. The officer reports that the suspect is traveling north at 100 miles per hour. The officer has reported the suspect's

Answers

The officer has reported the suspect's : Velocity

In order to count velocity, you need speed and direction to define it.

the police just describe the speed (100 miles per hour) and the direction (to the north)

hope this helps

The speed of the suspect's mobile is 100 miles per hour. This information is coupled with the direction which is due north. So, the officer has reported the suspect's velocity. Velocity is a vector quantity as it takes into account both the magnitude and direction.

If a transformer has a primary with 100 V and fifty coils, and a secondary that yields 20 V, how many coils are on the secondary? a.) 200 b.) 20 c.) 50 d.) 10 e.) 100

Answers

Ideally, if all the magnetic of one winding cuts the other winding, and there isn't any loss in the transformer core or the resistance of the wire, then the voltage across each winding is proportional to the number of turns in its coil.

If you apply 100 V to a winding of 50 turns, then a winding that yields 20 volts
must be wound with

(20/100) of 50 turns = 10 turns

What acceleration would engineers at Boeing calculate for the 737-900 during a typical take-off, given the plane's 78,200-kg mass and its maximum engine force of 121,000 N? A) 1.55 m/s² B) 0.98 m/s² C) 2.45 m/s² D) 0.62 m/s²

Answers

Answer:

Approximately $1.55\; {\rm m\cdot s^(-2)}$ , assuming that the runway is level, and that air resistance is negligible at the start of take-off.

Explanation:

The acceleration of this aircraft can be found in the following steps:

Find the net force on this aircraft.
Divide net force by mass to find acceleration.

Assume that when the plane just started the take-off, the air resistance (drag) on this aircraft is negligible. Forces on this aircraft during takeoff would include:

Weight of the aircraft (downward),
Normal force from the ground (upward), and
Thrust (forward.)

Under the assumption that the plane is on a level runway, forces in the vertical direction would be balanced. The only unbalanced force would be thrust, which is in the horizontal direction. Hence, the net force on this aircraft would be equal to thrust.

If the engine force is at the maximum value, the thrust and the net force on the aircraft would be $121,\!000\; {\rm N}$ . Divide the net force on this aircraft by mass to find acceleration:

$\begin{aligned} a &= \frac{F_{\text{net}}}{m} \n &= \frac{121000\; {\rm N}}{78200\; {\rm kg}} \n &\approx 1.55\; {\rm m\cdot s^(-2)}\end{aligned}$ .

In other words, the acceleration of this aircraft would be no greater than approximately $1.55\; {\rm m\cdot s^(-2)}$ under the assumptions.

Final answer:

The acceleration of the Boeing 737-900 during take-off, calculated using Newton's second law of motion (Force = Mass x Acceleration), is approximately 1.55 m/s².

Explanation:

The acceleration of the Boeing 737-900 during take-off can be calculated using Newton's second law of motion, which states that Acceleration = Force/Mass. In this case, the force is the maximum engine force, and the mass is the mass of the airplane. So, acceleration (a) = Force (F) / Mass (m) = 121,000 N / 78,200 kg = 1.548 m/s². Therefore, the closest answer to this calculation would be A) 1.55 m/s².

Learn more about Acceleration here:

brainly.com/question/2303856

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If light photons are massless then why are they attracted by black holes?

Answers

Answer:

Photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them.

Explanation:

is that what you wanted?

Which part of a scientific argument must be supported by valid data? claim evidence reasoning theory

Answers

This question is a bit ambiguous because all parts of a scientific argument must be supported by valid data. However, among the choices, the closest synonym to "valid data" would be evidence. Evidence is the body of facts or information that support a given idea.

Answer: Theory

Explanation: A claim is an interpretation based on the results of a given experiment, you first observe, and interpret the information.

Evidence is the valid data itself.

The reasoning is the approach or the "logic path" you used to reach some theory or claim.

The theory is an interpretation of the natural world, that explains why and or how some things work.

If we want to support a theory, we need to have some valid data that supports, at least, part of it, so the right answer here is theory.

Notice that claim also needs to be supported for valid data, but in the case of the claim you first get the data and then make the claim, and in the theory, the work is done in the other order.

One kilogram-meter per second squared is also equal to what unit

Answers

metres/second² is acceleration. maybe a bit more clarification?

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