Nearly all of the oxygen in the Earth's atmosphere was originally produced by photosynthesis in the leaves of trees that covered the continents 3.5 billion years ago
Indicate whether the statement is true or false
FALSE
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Which of the following is left behind when a star dies?
A) A black hole B) A red giant C) A gray dwarf D) A yellow node
The Schwarzschild radius of a black hole depends on
A) the observationally measured radius of the black hole. B) the way in which the black hole formed. C) only the mass of the black hole. D) both the mass and chemical composition of the black hole.
A tiny dust particle of mass 8.50 µg is being observed under a microscope. Its position is determined to be within a space of 0.0060 mm. (h = 6.626 × 10-34 J ? s)
(a) Find the uncertainty in its speed implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed in part (a), how many years would it take for the particle to move 1.0 mm?
What centripetal force does an 60-kg passenger experience when seated 12 m from the center of a Ferris wheel that rotates once every 4p seconds?
a. 484 N c. 914 N b. 180 N d. 240 N