PHYSICS HIGH SCHOOL

If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius isa. 273°C.
c. 705°C.
b. 327°C.
d. 873°C.

Answers

Answer 1
Answer: Kelvin is a base unit of temperaturescale from SI that defines as zero degree Kelvin (absolute zero). The absolutezero is a hypothetical statement that all molecular movement stops becausethere is no transient of energy for the molecules to move. When convertingtemperature in degree Celsius to Kelvin, add 273. You are given 600K and youare asked to find it in degrees Celsius. 

T(K) = T(C) + 273
600 K = T(C) + 273
T(C) = 600 – 273
T(C) = 327 °C
The answer is letter B.
Answer 2
Answer:

Answer:

Explanation:327

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1. What is meant by half-life?The time for a radioactive sample to reduce to half of its radioactivity.
The time for half of a radioactive sample to decay into new substances.
The time for a radioactive sample to reduce to half of its original mass.
The time for half of a radioactive sample to lose its radioactivity.

4. The isotope uranium-232 has a half-life of 68.9 years. How long will it take for 60% (N/N0 = 0.60) of the original sample to decay?

5.8 years
50.8 years
93.5 years
407 years

5. The isotope barium-133 has a half-life of 10.51 years. Of a 10 kg sample, how much will remain after 50 years?

0.37kg
4.53kg
8.64kg
270kg
6. A piece of bone from a horse found in an archaeological site is dated using carbon-14 dating. It is found that the bone has 78% of the carbon-14 that it would have when the horse was alive. Approximately how long ago did the horse die?

900 years ago
2,000 years ago
14,100 years ago
35,800 years ago
7. At an physics research facility 0.0027 kg of a new isotope is made in an atomic collider. After 6 seconds, 0.00147 kg remain. What is the half-life of the isotope?

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Answers

1. The time for a radioactive sample to reduce to half of its original mass.
4. 10% of 232 is 23.2 times 6 equals 139.2
68.9 x6 equals 413.4
5. 0.37kg
6. 2000 years
7. 6.84 seconds

Explain at least two differences between justice system laws and scientific laws.

Answers

The adversarial system is rigid – the roles are proscribed – the prosecutor wants to convict, the defendant wants a decision of not guilty. They are not just allowed but expected to bias their presentation, trusting the truth to come out between the adversaries. Science certainly has its sides of partisanship and bias. But these sides are self-imposed and can be abandoned at any time. While a prosecutor should not lie or hide evidence, and should drop a case if they become convinced the defendant is innocent, they wake up in the morning with no choice about which side of the argument they will come down on. In the criminal justice system the advocates are rigidly fixed in their roles and the jurors are rigidly neutral (the process to find a random neutral jury took as long as the trial itself). In science, the advocates are the same people as the jurors. And as a result they have to be willing to be flexible and change their minds. A good scientist shouldn’t have a pre-determined rigid answer to a question.
Lack of investigation – we jurors were told over and over not to investigate the situation ourselves. We were to make our decision only on the basis of the evidence presented to us. I can tell you in the case I was on there were at least two whopping big questions hanging over the case that nearly every juror in the room identified as very important but not addressed by either lawyer. Either one of them (whether the defendant’s schedule allowed time to drink before being stopped in the car, whether a particular medical condition could affect breathalyzer tests) could have changed the outcome. We could have answered one of these with 10 minutes on google and the other with some very simple subpoena of records. But we couldn’t use any of this. Scientists obviously are the opposite – if they need more information, they are expected to go get it before making an opinion.
Reliance on personal testimony – although science and trials share a focus on evidence, trials recognize testimony of individual people under oath as a major form of evidence. They certainly acknowledge the possibility of lying and explicitly instruct jurors to decide what testimony they believe. My case was unusual in that there was so much video footage, but still a majority of the case came down to testimony by the police officers, and most cases even a few years ago would have had only testimony. Science on the other hand, doesn’t accept testimony. Or does it? What else is the methods and results section of a paper? I’m on the fence whether science is so different on this one.

The waste products of a nuclear fission powerplant can best be described asa. Small in quantity and not very dangerous.
b. Large in quantity and not very dangerous.
c. Large in quantity and very dangerously radioactive. Eliminate
d. Small in quantity and very dangerously radioactive.

Answers

The answer is D. small in quantity and very dangerously radioactive.
a.
 
-> the products are stable atoms with a much lower atomic number. For example, Uranium 238 commonly breaks down into strontium and xenon, both of which are stable and non-radioactive.

They are also low in quantity because of the precision involved in breaking down a large atom via neutron capture means that few fission reactions take place.

Hope I helped :)

Source: I studied nuclear physics in year 11

Air is made of 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. What is the density of nitrogen? Please specify your soultion,thank you!

Answers

Volume % = mole %

Molar mass of oxygen = 32kg/kmol

Molar mass of nitrogen = 28 kg/kmol

 

Density of nitrogen = Density of oxygen x molar mass of oxygen x molar ratio of air x molar mass of nitrogen

Density of nitrogen = (1.43kgm^-3)(1 kmol O2/32 kg O2)(80 kmol N2/ 20 kmol O2)(28 kg N2/1 kmol O2) = 5.01 kg/m3

Billy drops a water ballon from the roof of his house. Since the balloon began with an original velocity of zero, how far above the ground was the balloon dropped if it took 2.5 seconds to hit the ground?

Answers

The distance between the roof and the ground where the balloon water was dropped is 30.65 meters. This is computed using the free fall formula which state that the height or distance is equal to the time it takes object to hit the ground times the constant gravity. In this case, 2.5 seconds times 9.807 meter per square second will then give us the 30.65 meter.
the answer is 30.6 good luck!

Suppose a log's mass is 5 kg. After burning, the mass of the ash is 1 kg. explain what May have happened to the other 4 kg

Answers


I think the "missing mass" may have escaped the site of the
conflagration in the form of hot, invisible gases, and in the form
of all the tiny particles in the smoke.
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