What is the basic definition of a black hole?
A) an object with gravity so strong that not even light can escape
B) a dead star that has faded from view
C) any object made from dark matter
D) a compact mass that emits no visible light
A) an object with gravity so strong that not even light can escape
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____ occurs when light travels out of a gravitational field, loses energy and its wavelength grows longer
a. A gravitational blue shift b. The solar wind c. A gravitational redshift d. A X-ray burst e. A pulsar wind
During a lunar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Earth between the Moon and the Sun. The Moon has a mass of 7.36 × 1022 kg; the Earth has a mass of 5.98 × 1024 kg; and the Sun has a mass of 1.99 × 1030 kg
The separation between the Moon and the Earth is given by 3.84 × 108 m; the separation between the Earth and the Sun is given by 1.496 × 1011 m. (a) Calculate the force exerted on the Earth by the Moon. (b) Calculate the force exerted on the Earth by the Sun. (c) Calculate the net force exerted on the Earth by the Moon and the Sun.
Newton showed that Kepler's laws are ________
A) seriously in error B) the key to proving that Earth orbits our Sun C) actually only three of seven distinct laws of planetary motion D) natural consequences of the law of universal gravitation
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a cooler temperature. C) The Sun's core would reach a new equilibrium, but at a higher temperature. D) The Sun's core would cool and the rate of fusion would decrease.