If there are two weights on the scale, one 1.5m from the fulcrum weighing 1.7 kg, and the second 1.2m from the fulcrum, what must the second weight weigh in order to balance the scale? a. 9 kg c. 2.1 kg b. 1.7 kg d. 2.4 kg

The fulcrum is the point in any mechanical device where the moment due to weights is zero.

(Weight 1 x distance 1) - (weight 2 x distance 2) = 0

(1.7 Kg x 1.5 m ) - (weight 2 x 1.2 m) = 0

weight 2 = (1.7 Kg x 1.5 m ) / 1.2 m

= 2.1 Kg

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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