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Q: A weight lifter has lifted 150 kg to a height of 2 m. He now lowers it carefully to the floor in 5 seconds. How much power is used Remember the force of an object's weight mass and times gravity.?
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How do you predict how fast an object will fall?

Easy! the formula is Gravity x Time(seconds) = Acceleration, gravity pull is basically 9.8m/s^2 (im not sure how to put squared so i used "^2" to symbolize it) and so basically if you drop a rock on a cliff count how many seconds it takes before it hits the ground, lets say that the rock took 8.5 seconds to hit the ground so you use the gravity pull and times it by the seconds which would be 8.5s x 9.8m/s^2= it is 83.3 meters deep


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The equation is: http://hyperphysics.phy-astr.gsu.edu/HBASE/imgmec/pend.gif T is the period in seconds, L is pendulum length in cm, g is acceleration of gravity in m/s2. We know on earth the period is 1s when the acceleration of gravity is 9.8m/s2, so the pendulum length is 24.824cm. The acceleration of gravity on the moon is 1.6m/s2. Substitute 24.824cm for L and 1.6 for g and you yield 2.475 seconds. The period is 2.475 seconds.


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