PHYSICS HIGH SCHOOL

If Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?​

Answers

Answer 1
Answer:

Answer:

10g

Explanation:

The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.

Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.

The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.

Therefore, we are left with about the same mass of substance we started with which is 10g.

Answer 2
Answer:

Answer:

10g

Explanation:

As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".

Though melting of tin isn't a chemical change, the same logic is applied here...

Hence,

The mass of tin will be 10 g itself...

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Which is NOT a characteristic of background radiation?A.) It is generally safe
B.) It includes cosmic rays
C.) It burns and causes lung cancer
D.) It occurs naturally in the environment

Answers

The one among the following choices that is not a characteristic of background radiation is that it burns and causes lung cancer. The correct option among all the options that are given in the question is the third option or option "C". The other options given in the question are all true in case of background radiation.

Answer:

C.) It burns and causes lung cancer

Explanation:

In the series circuit below the power source is a 9-volt battery and three resistors are R1 = 7 ohm, R2 = 9 ohm and R3 = 2 ohm. What is the total resistance in the series circuit? R1 7 ohm + R2 9 ohm + R3 2 ohm = 18
Is this correct?

Answers

Yes indeed. You're on your way. In a series circuit, the total resistance is the sum of the individuals no matter what order they're in. Now, if the question goes on to ask what is the current in the circuit, that will be the source voltage divided by the total resistance that you have calculated.

Name the physical quantity which changes contenously during uniform-circular motion.

Answers

The direction of the motion is constantly changing during
motion over any closed path, not only circular.

When you drive from the city to a distant farm, the temperature gets because of the ?

Answers

Answer:

Cooler

Explanation:

when you drive from city to farm the temperature of the farm is cooler than the temperature in the city.

this is because in city the population is very high as compare to the farms so, the activity  of the city is also high which lead to increase the energy consumption of the area.

air pollutants, green house gases are also present more in the city which leads to increase the temperature of the city.

this effect is called urban heat island effect.
Cooler, urban heat island effect.

Which process produces the energy radiated by the star when it becomes a main sequence star?

Answers

The process that produces the energy radiated by stars is nuclear fusion in the core.
For a star on the main sequence, it's the fusion of hydrogen nuclei into helium.

on a high way a car is driven 80 km the first 1 he of travel, 50km during the next 0.5 he, and 40 km in the final 0.5 hr. What is the cars average speed for the entire trip?

Answers


Average speed = (total distance covered) / (total time to cover the distance) .

Total distance = (80 + 50 + 40) = 170 km

Total time = (1 + 0.5 + 0.5) = 2 hours

Average speed = (170 km) / (2 hrs)= 85 km/hr .
 
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