Which of the following is not a characteristic that geologists use to identify minerals?

1 answer:

5 0

Geologists do not use a minerals color or streak to identify them because some minerals can have the same streak and color but the correct answer is
b) color

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A car rounds a flat curve and experiences a centripetal force directed toward the center of the curve and perpendicular to the d

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<h2>Answer:</h2>

If a car is rounding a flat curve, it experiences a centripetal force that pulls it towards the center of the circle it is rotating in.

Now,

The centripetal force can be balanced by the centrifugal force caused due to the acceleration of the body at the high speed which counters the centripetal force and in turn prevents the car from slipping down the curve.

So,

If the car doesn't hit the gas then the car will fall down from the curve as the Centripetal force will exceed the Centrifugal force of the car.

However, if the car doesn't hit the brake then the car will maintain it's position on the flat curve track as the centrifugal force will counter the effect of centripetal force directed towards the center.

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Personal ethics comes from a person's likes and dislikes true or false?

Artemon [7]

Personal ethics come from what you believe in as a person no what u or others like or dislike so ot would be false

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Distance between bholu and golu house house 9 km . bholu has to attend golu birthday party at 7am . he started from his home at

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For the rest 3 km

Bholu need to run in 5 minutes so

He need to 3 × 1000 / 5 × 60 m/s

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Plutonium-239 is a radioactive isotope commonly used as fuel in nuclear reactors. The half-life of plutonium-239 is 24,100 year

r-ruslan [8.4K]

Answer:

72,300 years.

Explanation:

Initial mass of this sample: 504 grams;

Current mass of this sample: 63 grams.

What's the ratio between the current and the initial mass of this sample? In other words, what fraction of the initial sample hasn't yet decayed?

$\displaystyle \frac{\text{Current Mass}}{\text{Initial Mass}} = \rm \frac{63\; g}{504\; g} = \frac{1}{8}$ .

The value of this fraction starts at 1 decreases to 1/2 of its initial value after every half-life. How many times shall 1/2 be multiplied to 1 before reaching 1/8? $2^{3} = 8$ . It takes three half-lives or $3\times 24100 = 72300$ years to reach that value.

In certain questions the denominator of the fraction is large. It might not even be an integer power of 2. The base-x logarithm function on calculators could help. Evaluate

$\displaystyle \log_{\frac{1}{2}}{\frac{1}{8}} = 3$ to find the number of half-lives required. In case the base-x logarithm function isn't available, but the natural logarithm function $\ln()$ is, apply the following expression (derived from the base-changing formula) to get the same result: