Can someone help me? Idk why I can't understand this

Physics

1 answer:

olya-2409 [2.1K]3 years ago

5 0

It's been a while since I've studied this, but my answers would be:

13. 5730 years. The half-life of a substance is the amount of time it takes for half of it to decay, and, according to the graph, half of the substance remained at 5730 years.

14. 10740 years. According to the graph, only 25% of the carbon remained after 10740 years.

15. 15 atoms. According to the graph, only 12.5% of the carbon remained after 16110 years. 12.5% of 120 atoms is 15 atoms.

16. 1600 atoms. According to the graph, if a sample of carbon is 10740 years old, only 25% of it remains. To find the original amount, multiply the current amount by (100% / 25%), which equals 4. So, 4. 400 atoms * 4 = 1600 atoms is the original amount.

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Answer:

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Explanation:

Mass of the rubber ball m = 5.24 kg = 0.00524 kg

Spring is compressed by 5.01 cm

So x = 5.01 cm = 0.0501 m

Spring constant k = 8.08 N/m

Frictional force f = 0.031 N

Distance moved by ball d = 15.8 cm = 0.158 m

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So remained energy to move the ball = 0.0101 - 0.0048 = 0.0052 J

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$\frac{1}{2}\times 0.00524\times v^2=0.0052$

v = 1.40 m/sec

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If a projectile fired beneath the water, straight up, breaks through the surface at a speed of 13m/s, to what height above the w

OlgaM077 [116]

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