PHYSICS HIGH SCHOOL

Define density and give its SI unit

Answers

Answer 1

Answer:

Answer:

Density is defined as mass per unit volume. its SI unit is: kg/m³

Explanation:

Answer 2

Answer:

Answer:

Density is defined as mass per unit volume. its SI unit is: kg/m³

Explanation:

from answer above

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a tungsten and coil has a resistance of 12 ohm at 15 degree celsius is the temperature coefficient of resistance of tungsten is 0.004 calculate the equal resistance at 80 degree Celsius

Answers

Answer:

The resistance of the tungsten coil at 80 degrees Celsius is 15.12 ohm

Explanation:

The given parameters are;

The resistance of the tungsten coil at 15 degrees Celsius = 12 ohm

The temperature coefficient of resistance of tungsten = 0.004/°C

The resistance of the tungsten coil at 80 degrees Celsius is found using the following relation;

R₂ = R₁·[1 + α·(t₂ - t₁)]

Where;

R₁ = The resistance at the initial temperature = 12 ohm

R₂ = The resistance of tungsten at the final temperature

t₁ = The initial temperature = 15 degrees Celsius

t₂ = The final temperature = 80 degrees Celsius

α = temperature coefficient of resistance of tungsten = 0.004/°C

Therefore, we have;

R₂ = 12×[1 + 0.004×(80 - 15)] = 15.12 ohm

The resistance of the tungsten coil at 80 degrees Celsius = 15.12 ohm.

A Universe Question!An astronomer see a star that is very far away but still very bright. What can she conclude about the star?

A) The star must be very large.
B) The star must be very small.
C) The star must be moving away from Earth.
D) The star must be moving closer to Earth.

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I'm pretty sure this is A

How much energy in joule does the heater deliver in 7 secondsThe heater has a power output of 3kW

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Answer:

In a nuclear reactor, the moderator is: usually made of graphite placed between the fuel rods used to slow down neutrons all of the above none of the above

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The correct answer is all of the above. In a nuclear reactor, the moderator is usually made of graphite, placed between the fuel rods, and used to slow down neutrons. The nuclear moderator is a medium in which reduces the speed of the fast neutrons.

The answer is D. All the above

Cellular telephones use what type of wave?

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Cellphones use radio frequency waves to transmit sound through the speaker and the microphone. The radio frequency energy that is given off by cell phones is a type of electromagnetic energy.
I hope I helped! =D

cellular telephones use radio frequency waves

An electroscope is a device that detects charge on objects that touch it or are brought near it. John rubs a piece of cotton fabric on a plastic rod and then touches the rod to the electroscope.What methods of charging does John use?

Answers

The answer is Static Electricity. When you say static electricity, there is a certain imbalance in the particles present on the surface of the material. That is why the electroscope was able to detect static electricity from the piece of cloth and plastic rod

Answer:

John charges the rod through friction, then charges the electroscope through conduction. D on edg2020

Explanation:

Other Questions

What is the basic difference between a nuclear fission reaction and a nuclear fusion reaction?A) Fusion is a synthesis reaction while fission is a decomposition reaction. B) Fusion is an exothermic reaction while fission is an endothermic reaction. C) Fusion does not generate energy while fission generates a huge amount of energy. D) Fusion only takes place in the stars so it cannot be used on Earth to generate energy while fission can be used here for energy.

What is the main difference between primary and secondary succession?A The climax of primary succession is pine forest B Primary succession begins with bare rocks C Secondary succession begins with mossed and lichens D Secondary succession include frequent fires

Define unit of electric work (JOULE) in relation to quantity of charge and potential difference.

The volume occupied by a sample of gas is 480 mL when the pressure is 115 kPa.What pressure must be applied to the gas to make its volume become 650 mL? (P2= P1V1/V2)