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2 years ago

11

A 432 g sample of 60/27Co has a decay constant of 4.14 x 10-9 s-1. How long will it take before only 1/3 of the original sample

remains?

1 answer:

Radda [10]2 years ago

5 0

Answer:

432 60 27 4.14 10 9 1=15000

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Speed is a component of skill related fitness. what does speed enable you to do

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To complete a task in a short amount of time/get from A to B in the quickest amount of time

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3 years ago

The unit of kinetic energy is the _______. The unit of kinetic energy is the _______. hertz meter watt joule radian

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Answer:

joule

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3 years ago

What happens to the momentum of an object when velocity is kept the same and the mass is increased?

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Momentum = mass x velocity so if velocity is kept same and mass is increased then momentum will increase.

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3 years ago

Astronomers have observed a small, massive object at the center of our Milky Way Galaxy. A ring of material orbits this massive

Setler [38]

Answer:

The mass of the massive object at the center of the Milky Way galaxy is $3.44\times10^{37}\ Kg$

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Given that,

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We need to calculate the radius of the orbit

Using formula of radius

$r=\dfrac{d}{2}$

$r=\dfrac{15\times9.461\times10^{15}}{2}$

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We need to calculate the mass of the massive object at the center of the Milky Way galaxy

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Put the value into the formula

$M=\dfrac{(180\times10^3)^2\times7.09\times10^{16}}{6.67\times10^{-11}}$

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3 years ago

You hold a metal block of mass 40 kg above your head at a height of 2 m.

Kitty [74]

Answer:

The work done by gravity is 784 J.

Explanation:

Given:

Mass of the block is, $m=40\ kg$

Height to which it is raised is, $h=2\ m$

Acceleration due to gravity is, $g=9.8\ m/s^2$

Now, work done by gravity is equal to the product of force of gravity and the distance moved in the direction of gravity. So,

$\textrm{Work by gravity}=F_g\times h$

Force of gravity is given as the product of mass and acceleration due to gravity.

$\therefore F_g=mg=40\times 9.8=392\ N$ . Now,

$\textrm{Work by gravity}=F_g\times h=392\times 2=784\ J$

Therefore, the work done by gravity is 784 J.

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3 years ago