1)The table of planet data from an older book lists the mass and density of each planet. But the mass of Pluto was unkno

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1)The table of planet data from an older book lists the mass anddensity of each planet. But the mass of Pluto was unknown at thetime. Why?
a. The Hubble Telescope was not yet in orbit
b. no space probes had reached Pluto yet
c. No moons had been discovered around Pluto yet
d. I don't know about Pluto, but did we know the mass of Goofyyet?
8) These two pulleys are attached together on a common axle. Thelarger one has a radius twice as large as the smaller one, and thesmaller one supports a mass of 4.0kg. What mass X will keep thesystem form rotating?
a. 1.0kg
b. 2.0kg
c. 4.0kg also