These diagrams represent four possible models for the universe. Each model shows how the size of the observable universe changes with time. Of the four models, which one gives the universe the oldest age at present?
A) accelerating universe
B) coasting universe
C) critical universe
D) recollapsing universe
E) The age of the universe would be the same no matter which model is correct.
A) accelerating universe
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If the current drawn from a 12-volt car battery is 100 amperes when it is short circuited with a wire, the resistance of the wire is 0.12 ohms
a. True b. False Indicate whether the statement is true or false
Your company has developed a new polymer, and you are asked to determine
(a) its elastic modulus and (b) its viscosity. To measure these properties, you choose to conduct a stress-relaxation test at 300 K. At 300 K a specimen of the new polymer is strained at t=0 by an amount of 3×10-3, and this requires an initial stress of 6×106 Pa. This strain is constant for 100 hours, and the stress on the polymer has dropped to 3×106 Pa. Assume that this polymer can be modeled as a Maxwell solid, with the viscous component behaving as a Newtonian fluid.
You are feeling like spaghetti. Although normally only about 2 meters tall, you are now about 25 meters long
(How fortunate, if painful, that the being has arranged for your body to become elastic enough so that it is not ripped apart under these conditions.) As you look up over your head, you see things moving pretty quickly in the universe—but that lasts only for a brief instant, and then all contact with the universe is lost. Where are you? A) You are plunging into the Sun. B) You are crossing the event horizon of a black hole. C) You are being consumed by a "crack" in the universe caused by inflation. D) You are near the center of a star that has just developed an iron core, leading to a supernova. E) You are in a medieval torture chamber somewhere in western Europe.
You observe a star very similar to our own Sun in size and mass. This star moves very slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet
What can you conclude about the orbiting planet? A) The planet must be closer to the star than Earth is to the Sun. B) The planet must be farther from the star than Neptune is from the Sun. C) The planet must have a mass about the same as the mass of Jupiter. D) You do not have enough information to say anything at all about the planet.