PHYSICS HIGH SCHOOL

What does the atomic number of an element represent? Question 21 options: A. the number of protons in an atom B. the number of neutrons in an atom the mass of an atom C. the total number of protons, neutrons, and electrons in an atom D. the order in which the element was discovered

Answers

Answer 1

Answer:

Answer:

A. the number of protons in an atom

Explanation:

The atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom.

Answer 2

Answer:

Answer:

A. the number of protons in an atom

Explanation:

Related Questions

A 250 gram ball at the end of a string is revolving uniformly in a circle of radius 0.75 meters.The ball makes 2.0 revolutions per second. What is the centripetal acceleration?
Genes are unable to determine a person's A. Eye color B. Athletic ability C. Number of teeth D. Shape of earlobes
Why is it hazardous to use too small cables and electrodes for a too high current?
A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hour. Give the original speed of the train. a. 20 miles/hour b. 25 miles/hour c. 30 miles/hour d. 35 miles/hour
A 0.15-kg ball is thrown into the air and rises to a height of 20.0 m. How much kinetic energy did the ball initially have?

Which of the following rules should be used to keep the appropriate distance between your vehicle and the vehicle in front of you?

Answers

The correct answer is C) Two-second rule.

This means that a driver must maintain a distance that would take at least 2 seconds to cover, at the current speed of the car. This means that in case the car in front suddenly comes to a full stop, the driver of the car behind has 2 seconds react and hit his own brakes. A two-car length rule might be alright when driving at low speeds, but when going at high speeds (on a highway, for example), a two-car length can be covered in a fraction of a second, which means a sudden braking by the car in front would almost guarantee an accident.

Answer:

4-second following distance

You drop a rock down a well that is 5.4 m deep. How long does it take the rock to hit the bottom of the well?

Answers

Equation of motion:

$y_(f)=y_(o)+v_(o)t+ (1)/(2) at^(2)$

Since initial velocity is zero, the second term goes away:

$y_(f)=y_(o)+0+ (1)/(2) at^(2)$

$y_(f)=y_(o)+(1)/(2) at^(2)$

$y_(f)-y_(o)= (1)/(2) at^(2)$

$y_(f)-y_(o)=5.4m$

$5.4m= (1)/(2) at^(2)$

$(2(5.4m) )/(a) = t^(2)$

$a = g = 9.81 (m)/( s^(2))$

$(2(5.4m) )/(9.81 (m)/( s^(2) ) ) = t^(2)$

$1.1 s^(2) = t^(2)$ $\sqrt{1.1 s^(2)} = \sqrt{t^(2)}$

$t = 1.05s$

Answer:

1.05 s

Explanation:

A rock containing valuable minerals that can be mined is called A. An inorganic compound
B. An igneous rock
C. An ore
D. An organic compound

Answers

A rock containing valuable minerals that can be mined is called an ore. The correct option is C.

What is an ore?

Ore is a deposit of one or more valuable minerals present inside the Earth's crust.

Metals essential to industry and trade, such as copper, gold, and iron, are found in the most valuable ore deposits. Copper ore is mined for a number of industrialapplications.

Ore is natural rock or sediment that contains one or more valuable minerals, usually metals, and can be mined, treated, and sold for a profit.

Mining extracts ore from the Earth, which is then treated or refined, often through smelting, to extract valuable metals or minerals.

Crushing the rock is the first step in extractingore from it. Heap leaching, flotation, or smelting are methods for extracting ore from rock.

Thus, the correct option is C.

For more details regarding an ore, visit:

brainly.com/question/4712893

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Technician A says that an oxygen sensor can have one, two, three, four, or more wires, depending on the style and design. Technician B says that if the exhaust has little oxygen, the voltage of the oxygen sensor will be close to 1 volt (1000 mV) and close to zero if there is high oxygen content in the exhaust. Who is right?

Answers

Answer:

Both technicians A and B are right.

Explanation:

-The most common application is to measure the exhaust-gas concentration of oxygen.The probe typically has four wires attached to it: two for the lambda output, and two. The number of wires depends on design and style.

-An oxygen sensor will typically generate up to about 0.9 volts( $\approx 1.0V$ ) when the fuel mixture is rich and there is little unburned oxygen in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1( $\approx 0.0V$ )volts

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