Archive for the ‘reference’ tag
Universal Density
Universal Density
universal gravitation….?
1) When a falling meteoroid is at a distance above the Earth’s surface of 3.30 times the Earth’s radius, what is its acceleration due to the Earth’s gravitation?
2) The gravitational force exerted on a solid object is 5.90 N. When the object is suspended from a Spring Scale and submerged in water, the scale reads 3.50 N. what is the object’s density?
thanks
1. F = GMm/r^2, a = GM/r^2 where M = mass of earth. You know M, you know M, you know G. Just plug into the formula.
2. The buoyant force is 5.90 – 3.50 N = 2.40 N. That is, water that has the same volume V as the object, has a weight of 2.40 N.
This object has a weight of 5.90 N in the same volume. So its density compared to water is 5.90/2.40. What is the density of water? That will tell you the density of the object.
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