PHYSICS MIDDLE SCHOOL

Of course, I'll be the same like anyone else. mARkInG bRaInlESt iF cORrEcT

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Answer 1

Answer:

Answer:

(a) Brightness if the bulb will reduce.

(b) The bulb will remain the same

Answer 2

Answer: C because i’m so good at biology and the anatomy of the human body would have sex

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What are some examples of convection in our daily lives

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When we boil water on the stove is a good one.

How do particle collisions transfer energy?How does conduction transfer heat in solids?

What is a conductor?

What is an insulator?

Convection?

What is density?

Does density depend on temperature?

Thanks for taking the time to answer these questions. I REALLY appreciate your help, and your time. U are the best! Once again, thanks and please answer all the questions. That would be helpful. Thank you sooooo much!!

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Conduction is a method of Heat transfer in solids by mutual vibration of the solid particles. The heat particle of one solid receives the heat, and transfer it to the next solid particle to it. This is as a result of the particles touching each other and by a little vibration of the particles.

A conductor is a material that allows the transfer of heat in this case. It could also allow the transfer of electrical current. Example Iron, Copper.

An insulator is a material that is poor in transfer heat or electric current from one point to another. Example is Wood.

Convection is a method of heat transfer in liquid or air medium, by the actual or bulk movement of the heated medium. E.g transfer of heat from hotter air to cooler air, transfer of heat from hotter region of boiling water to the cooler region which is at the surface.

Density is simply mass per unit volume.
Density = Mass / Volume, It's SI Unit = Kg/m3.

Does density depend on temperature?

This is a bit tricky. For liquids we should say yes, there is appreciable difference in density. For example we know that water has maximum density of 1 g/cm3 at 4 degrees Celsius.

But for solids, the density is not affected much, except at very high temperatures.

So in summary we should say Density is affected by temperature, because we know that the volume of the material would be affected and hence the density is affected likewise.

Sorry, the solution came a little bit late.

Am I correct on on 1,2,4? I need help on 3. I WILL GIVE BRAINLIEST!

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I think you are right on 1,2 and 4. I believe the answer would be D?!

hope this helps

Mrs. Patil travels from her home to work in 0.25 hours. The direct distance between her home and work is 8.0 miles. If Mrs. Patil travels 12.4 miles from home to her job, what is her average velocity during the trip?

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Regardless of the path taken, at the end of the trip Mrs. Patil will be 8.0 miles away from home. If the path taken involves a trip lasts 0.25 hours, then the average velocity over the trip is

$\frac{8.0\,\mathrm{mi}}{0.25\,\mathrm h}=32\,\frac{\mathrm{mi}}{\mathrm h}$

94. While you are traveling in a car on a straight, level interstate highway at 90 km/h another car passes you in the same direction, its speedometer reads 120 km/h (a) What is your velocity relative to the other driver? (b) What is the other car's velocity relative to you?

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Answer:

a) $v_{A_(B)}$ = -30 m/s

b) $v_{B_(A)}$ = 30 m/s

Explanation:

Consider the car A travel at a velocity of $v_(A)$ = 90 km/h and the car B travel at the velocity of $v_(B)$ = 120 km/h. As the velocity of the car B is greater than the car A, So it cross the car A. Consider The velocity of car A relative to car B is $v_{A_(B)}$ and it is equal to the velocity of car A minus the velocity of car B.

$v_{A_(B)}$ = $v_(A)$ - $v_(B)$

$v_{A_(B)}$ = 90 - 120

$v_{A_(B)}$ = -30 m/s

Consider The velocity of car B relative to car A is $v_{B_(A)}$ and it is equal to the velocity of car B minus the velocity of car A.

$v_{B_(A)}$ = $v_(B)$ - $v_(A)$

$v_{B_(A)}$ = 120 - 90

$v_{B_(A)}$ = 30 m/s

A block of lead has dimensions of 4.50cm by 5.20cm by 6.00cm. The block weighs 1587g. From this information, calculate the density of the lead.

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Density = Mass / Volume
Volume = Area x Length = (4.50 x 5.20) x 6.00 = 140.4
Density = 1587 x 140.4 = 222,814.8 g/cm3 (cubed)
222,814.8 / 1000 = 222.8148 kg/m3 (cubed)

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