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lesya692 [45]
3 years ago
7

Imagine a 10kg block moving with a velocity of 20m/s to the left.

Physics
1 answer:
lara31 [8.8K]3 years ago
3 0
Kinetic energy , KE= [1/2]m*v^2

m = 10 kg
v=20m/s

KE = [1/][(10kg)(20m/s)^2 = [1/2](10kg)(400m^2/s^2) = 2000 joule

Answer: 2000 joule
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8 0
1 year ago
Light has a frequency of about 6 x1014 Hz.
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4 0
2 years ago
Why is density used to determine the identity of matter?
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3 years ago
An alpha particle (α), which is the same as a helium-4 nucleus, is momentarily at rest in a region of space occupied by an elec
vaieri [72.5K]

Answer:

Speed = 575 m/s

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Explanation:

Given :

Potential difference, U = $-3.45 \times 10^{-3} \ V$

Mass of the alpha particle, $m_{\alpha} = 6.68 \times 10^{-27} \ kg$

Charge of the alpha particle is, $q_{\alpha} = 3.20 \times 10^{-19} \ C$

So the potential difference for the alpha particle when it is accelerated through the potential difference is

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And the kinetic energy gained by the alpha particle is

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From the law of conservation of energy, we get

$K.E. = U$

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$v_{\alpha} = \sqrt{\frac{2(3.45 \times 10^{-3 })(3.2 \times 10^{-19})}{6.68 \times 10^{-27}}}$

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The mechanical energy is conserved in the presence of the following conservative forces :

-- electrostatic forces

-- magnetic forces

-- gravitational forces

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3 years ago
How does the height from which you drop the ball relate to the height that the ball bounces back up?
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3 years ago
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