The acceleration of gravity is 9.8 m/s². This simply means that when anything falls, its downward speed keeps increasing, and it falls 9.8 m/s faster every second than it fell 1 second earlier.
After 3 seconds of falling, the object is falling at (3 x 9.8 m/s) = 29.4 m/s faster than at the beginning of the 3 seconds. If it had no vertical speed at the beginning of the 3 seconds, then THAT's its speed after 3 seconds . . . . . <em>29.4 m/s</em> downward.
As far as being thrown horizontally off the cliff . . . that has no effect on it vertical speed. Horizontally, it doesn't matter whether it rolls gently over the edge, or somebody throws it horizontally, or it gets shot horizontally out of a high power rifle. It hits the ground at the same time and with the same speed in every case.
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
Answer:
The speed of a turtle is 4m/s
Explanation:
speed = distance/time
distance = 100m
time = 25s
s = 100/25
= 4m/s
Answer:bggfd
<em>this cow be doing that viurtua</em>Explanation:
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Answer:
a. 2.5 X 10^-1
Explanation:
First of all we shall calculate the resistance of the bulb of 75W , 240 V .
power = V² /R , V is potential and R is resistance
75 = 240²/ R
R = 240²/ 75
= 768 ohm .
Now this bulb is used with 120 V
current = 120 / 768
= .15625 A
power = V X I
potential x current
= 120 x .15625
= 18.75 W.
comparing it with 75 W
the ratio
18.75 / 75
= 2.5 x 10⁻¹.
