What is the significance of Planck time?
A) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
B) It is the time at which inflation is thought to have occurred.
C) It is the time when the cosmic microwave background was released.
D) It is the amount of time required for two protons to fuse to make deuterium.
A) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
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Coulomb's Law: Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?
A. A B. B C. C D. D
Describe how Erastothenes measured the circumference of our planet
What will be an ideal response?
A futuristic design for a car is to have a large solid disk-shaped flywheel within the car storing kinetic energy. The uniform flywheel has mass 370 kg with a radius of 0.500 m and can rotate up to 230 rev/s
Assuming all of this stored kinetic energy could be transferred to the linear velocity of the 1600-kg\ car, find the maximum attainable speed of the car.
Isaac Asimov, noted popularizer of science and science fiction author, has addressed overpopulation: "democracy cannot survive overpopulation. Human dignity cannot survive [overpopulation]. Convenience and decency cannot survive [overpopulation]
As you put more and more people onto the world, the value of life not only declines, it disappears. It doesn't matter if someone dies, the more people there are, the less one person matters." Respond to Asimov's statement by discussing any evidence available.