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3 years ago

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monica and andre are investigating The difference between physical and chemical change they list their observations in the table

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velikii [3]3 years ago

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A sample of rock is found to contain 200 grams of a parent isotope.how many grams of the parent isotope will remain after one ha

emmasim [6.3K]

Answer: 100 grams of the parent isotope will remain after one half life.

Explanation:

Mass of the isotope present at initial stage = $N_o=200 g$

The mass of the parent isotope left after the time ,t=N

Time taken by the samle ,t = $t_{\frac{1}{2}}$

The half life of the sample : $t_{\frac{1}{2}}$

$N=N_o\times e^{-\lambda t}$

$\lambda =\frac{0.693}{t_{\frac{1}{2}}}$

$\ln[N]=ln[N^o]-\frac{0.693}{t_{\frac{1}{2}}}\times t_{\frac{1}{2}}$

$2=\frac{[N_o]}{[N]}$

$[N]=\frac{N_o}{2}=\frac{200 g}{2}=100 g$

100 grams of the parent isotope will remain after one half life.

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3 years ago

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What is the average airspeed velocity of an unladen swallow

AleksAgata [21]

Answer:

10 meters/second.

Explanation:

Unladen swallow consists of two species are <em>Hirundo domicella </em>and the <em>Hirundo spilodera</em>.

The average speed of unladen swallow comes out to be 10 meters/second. The maximum speed can go upto 13-14 meters/second. The speed of unladen swallow can be calculated by the formula given by Graham K. Taylor. According to graham the speed of unladen swallow is 3 times of the product of frequency and amplitude. ( v= 3fA, v is velocity, f is frequency and A is amplitude).

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3 years ago

Plz help the question is the picture down below. And the subject is science I'm sorry guys I'm in a hurry

tatyana61 [14]

Answer:

clay water and silt

Explanation:

it may be right but not for sure

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3 years ago

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Spider monkeys live in a biome with many trees. they move around by swinging from tree to tree. spider monkeys do not build a ne

Nataliya [291]

Spider monkeys live in a <span>tropical rainforest

A savanna is a grassland with VERY FEW trees.
Polar ice is like Antartica.
The desert is all sand, no trees.
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3 years ago

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Identify the main function of a stereo dissection microscope

nignag [31]

Answer: Allows a magnified 3-Dimensional perspective when dissecting. This enables more accuracy in movements.

Explanation:

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3 years ago