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Mariana [72]
3 years ago
14

a radioactive element has a half-life of 30 days. calculate the mass of the element that remains after 20 days if 100g of the el

ement decays. Also, calculate the decay constant.
Physics
1 answer:
patriot [66]3 years ago
4 0

Explanation:

the answer is in the image above

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A combined circuit has two resistors in parallel (34.0 ohms and 41.0 ohms) and another in series (15.0 ohms). If the power sourc
snow_lady [41]

If the power source is 9.0 volts, the current will be 0.27 amps. The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you, and if you would like, feel free to ask another question.

4 0
3 years ago
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As a science fair project, you want to launch an 950 g model rocket straight up and hit a horizontally moving target as it passe
Aleksandr-060686 [28]

Answer:

As a science fair project, you want to launch an 950g model rocket straight up and hit a horizontally moving target as it passes 33.0m above the launch point. The rocket engine provides a constant thrust of 20.0N . The target is approaching at a speed of 18.0m/s . At what horizontal distance between the target and the rocket should you launch?

= 43.56m

Explanation:

acceleration =

(20 - (0.95 * 9.8) )/ (0.95)

= 10.68 / 0.95

= 11.24 m/s²

we use

s = ut + (1/2) at²

Given that

s= 40

u =0  

s = 0 * t + (1/2) (11.24)t²

t = √(66/1.24)

t = √5.87

t = 2.42sec

hence

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= 43.56m

5 0
3 years ago
A circuit has two 4Ω resistors in series with each other. What is the total resistance?
Paha777 [63]

Answer: 8Ω

Explanation:

Since there are two resistors of 4Ω

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R2 = 4Ω

Rtotal = ?

Rtotal = 4Ω + 4Ω

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Write a sentence to describe how an image is formed on retina<br>when looking at distant objects.​
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What does it mean to say that the average speed of a car is 35 miles per hour?
LenKa [72]
It means that the car has covered

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At some points during that time, the car was most likely moving
faster or slower than 35 miles per hour.  We don't know.  We only
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