The universal law of gravitation says that the gravitational force between the two masses is
<em>F</em>₁ = <em>G</em> <em>m</em>₁ <em>m</em>₂ / <em>r</em> ² = 6.0 × 10⁻⁶ N
where <em>r</em> = 12 m. When the distance between the two masses is reduced to <em>R</em> = 4 m, i.e. 1/3 of the original distance <em>r</em>, we have
<em>F</em>₂ = <em>G</em> <em>m</em>₁ <em>m</em>₂ / <em>R </em>² = <em>G</em> <em>m</em>₁ <em>m</em>₂ / (<em>r</em>/3)² = 1/9 <em>G</em> <em>m</em>₁ <em>m</em>₂ / <em>r </em>² = 1/9 <em>F</em>₁
so that the resulting gravitational force has 1/9 the first magnitude, or
<em>F</em>₂ = 1/9 (6.0 × 10⁻⁶ N) ≈ 6.7 × 10⁻⁷ N
A scientific hypothesis can certainly be valid even if it cannot be tested by observation or experimentation.
But you don't <u><em>know</em></u> whether or not it's valid.
1 atm = 760 mm Hg
2,5 atm = 2,5 * 760 = 1900 mm Hg
b
Answer:
Electromagnetic
Explanation:
All electromagnetic waves have a certain energy and frequency, and since they are a form of radiation, they can propogate even through space.
<span>With a power supply able to produce 125 an of current, then the time on how long must the nails stay in the electrolysis chamber to receive 1.33×107 c of charge is 10 hours, then a minute of 29, and lastly, 20 more seconds. </span>
