The fact that the properties of the Universe are close to the dividing line between open and closed Universes refers to the _______________ problem
Fill in the blank(s) with correct word
flatness
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Which of the following are not found on Venus?
a. volcanoes b. coronae c. rolling plains d. lobate scarps e. high atmospheric pressure
A generator is designed to produce a maximum emf of 170 V while rotating at 3200 rpm. The coils of the generator are circular with diameter 7.5 cm. Assuming the magnetic field in the generator is 0.075 T, what is the number of loops needed in the generator coil?
A. 160 B. 1530 C. 6120 D. 4810 E. 25
What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The orbits of stars in the center of the galaxy indicate that the presence of an approximately 4 million solar-mass object in a region no larger than our solar system. B) Huge amounts of x-rays are pouring out of the center of the galaxy. C) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole. D) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.
What is Charon?
What will be an ideal response?