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Anuta_ua [19.1K]
4 years ago
11

What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?

Physics
1 answer:
Lesechka [4]4 years ago
8 0
Ke=1/2mv^2
Ke= 0.5*30*20^2
Ke= 6000joules
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The radius of the earth's very nearly circular orbit around the sun is 1.5 1011 m. find the magnitude of the earth's velocity, a
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The radius of Earth's circular trajectory is
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t=365(days)*24(hours)*3600(seconds) =3.1536*10^7 (s)
Thus the velocity is velocity
v=2\pi R/t =2\pi *1.5*10^{11}/(3.1536*10^{7})=2.99*10^4 (m/s)
From this we can deduce the centripetal acceleration
a=v^2/R =(2.99*10^4)^2/(1.5*10^{11}) =5.96*10^{-3}  (m/s^2)
Angular velocity is
\omega =v/R =(2.99*10^4)/(1.5*10^{11})=2*10^{-7} (rad/s)

5 0
3 years ago
Astronauts measure their mass by measuring the period of oscillation when sitting in a chair connected to a spring. The Body Mas
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Answer:

55 kg

Explanation:

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mass of chair (Mc) = 12 kg

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       taking π as 3.142

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therefore

mass of astronaut = 67 - 12 = 55 kg

4 0
3 years ago
Longitude lines are not ____________________________ like latitude lines.
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5 0
3 years ago
What is molecular force and gravitational force with their examples .​
Bumek [7]

Answer:

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Explanation:

8 0
3 years ago
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