4 years ago

What element is used as a source of radiation in smoke detectors?

Physics

1 answer:

mart [117]4 years ago

4 0

Americium ( A source of alpha radiation to detect and identify smoke.)

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What’s the force of a pitching machine on a baseball? Baseballs pitched by a machine have a horizontal velocity of 30 meters/sec

Leya [2.2K]

The acceleration of the baseball is:
$a= \frac{v_f-v_i}{\Delta t}$
where $v_f$ and $v_i$ are the final and initial speed of the ball, and $\Delta t$ is the time interval in which the force acted.

Replacing the numbers, we get
$a= \frac{30 m/s-0m/s}{0.5 s}=60 m/s^2$
And at this point, we can use Newton's second law F=ma to find the value of the force of the pitching machine:
$F=ma=(0.15 kg)(60 m/s^2)=9 N$

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3 years ago

Two charges are separated by a certain distance. If the magnitude of each charge and the distance are both doubled, the force

ycow [4]

Doubled I think i’m not sure tho

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3 years ago

Two very small spheres are initially neutral and separated by a distance of 0.66 m. Suppose that 5.7 × 1013 electrons are remove

andrezito [222]

Answer:

1.718 N , attractive

Explanation:

r = 0.66 m, n = 5.7 x 10^13

q1 = 5.7 x 10^13 x 1.6 x 10^-19 = 9.12 x 10^-6 C

q2 = - 5.7 x 10^13 x 1.6 x 10^-19 = - 9.12 x 10^-6 C

F = K q1 q2 / r^2

F = 9 x 10^9 x 9.12 x 10^-6 x 9.12 x 10^-6 / (0.66)^2

F = 1.718 N

As both the charges are opposite in nature, so the force between them is attractive.

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3 years ago

Why do scientists use the scientific method when completing experiments.

polet [3.4K]

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Scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis.

Explanation:

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What is the meaning of friend ?

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Answer:

person that you know and like (not a member of your family), and who likes you

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