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2 years ago

14

The half-life of a radioisotope is 6.0 hours. Approximately how long will it take for the activity of a sample to be reduced by

98%?

1 answer:

DerKrebs [107]2 years ago

3 0

Answer:

1 hours will be the best answer

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Name the spectrum of radiations that includes both microwaves and infrared radiation.

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Answer:

light

Explanation:

Light is part of a spectrum of electromagnetic energy that includes radio waves, microwaves, infrared radiation, visible light, ultraviolet "light", x rays, and gamma rays.

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Please help although I think I have the awnser but correct me if I’m wrong

iren2701 [21]

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Plants in a tropical rain forest usually have

Karolina [17]

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a parent swings a 18.5 kg child in a circle of radius 1.05m, making 5 revolutions in 13.4s. what centripetal acceleration does t

Zolol [24]

Answer: $0.146 m/s^{2}$

Explanation:

The <u>centripetal acceleration</u> $a_{c}$ of an object moving in a uniform circular path is given by the following equation:

$a_{c}=\frac{V^{2}}{r}$ (1)

Where:

$V$ is the tangential velocity

$r=1.05 m$ is the radius of the circle

On the other hand, the tangential velocity is expressed as:

$V=\omega r$ (2)

Where $\omega$ is the angular velocity, which can be found knowing the child makes 5 revolutions in 13.4s:

$\omega=\frac{5 rev}{13.4 s}=0.37 rev/s$ (3)

Substituting (3) in (2):

$V=(0.37 rev/s)(1.05 m)$ (4)

$V=0.39 m/s$ (5)

Substituting (5) in (1):

$a_{c}=\frac{(0.39 m/s)^{2}}{1.05 m}$ (6)

Finally:

$a_{c}=0.146 m/s^{2}$

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2 years ago

Read 2 more answers

Question 2 of 25

timofeeve [1]

Answer:its 10

Explanation:

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