CAN SOMEONE PLEASE HELP ME!!?
1 answer:
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Complete Question
Martin is conducting an experiment. His first test gives him a yield of 5.2 grams. His second test gives him a yield of 1.3 grams. His third test gives him a yield of 8.5 grams. On average, his yield is 5.0 grams, which is close to the known yield of 5.1 grams of substance. Which of the following are true?
A His results are accurate but not precise.
B His results are neither accurate nor precise.
C His results are both accurate and precise
D His results are precise but not accurate.
Answer:
Correct option is A
Explanation:
From the question we are told that
The yield of the first test
The yield of the second is
The third yield is
The average yield
The know yield is
From the data given we see that
Since his average yield is closer to the known yield then the answer is accurate
But since the yield for each test are not repeated the answer is not precise
So the answer is accurate but not precise
To solve this problem it is necessary to apply the concepts related to the relationship between tangential velocity and centripetal velocity, as well as the kinematic equations of angular motion. By definition we know that the direction of centripetal acceleration is perpendicular to the direction of tangential velocity, therefore:
Where,
V = the linear speed
r = Radius
Angular speed
The angular speed is given by
Replacing at our first equation we have that the centripetal acceleration would be
To transform it into multiples of the earth's gravity which is given as the equivalent of 1g.
PART B) Now the linear speed would be subject to:
Therefore the linear speed of a point on its edge is 51.05m/s