What happens to the planets in a galaxy when that galaxy collides with another galaxy?
a) They are pulled out of their orbits by the tidal forces of the intruding galaxy.
b) Smaller stars collide with each other, forming more massive stars which swallow the planets.
c) Nothing, because the spaces between stellar systems in a galaxyis much larger thantheir size.
d) They accrete a whole lot of new matter and become stars themselves.
e) They ignite completely and explode violently.
Ans: c) Nothing, because the spaces between stellar systems in a galaxyis much larger thantheir size.
You might also like to view...
For a star of Sun-like mass, what is the last stage of the nuclear fusion?
a. Hydrogen to helium b. Helium to carbon and oxygen c. Carbon to magnesium d. Fusion goes all the way up to iron.
Work-Energy Theorem: Three cars (car L, car M, and car N) are moving with the same speed and slam on their brakes. The most massive car is car L, and the least massive is car N. If the tires of all three cars have identical coefficients of kinetic friction with the road surface, for which car is the amount of work done by friction in stopping it the greatest?
A. The amount of work done by friction is the same for all cars. B. Car L C. Car M D. Car N
Rotational Kinetic Energy: Consider a uniform hoop of radius R and mass M rolling without slipping. Which is larger, its translational kinetic energy or its rotational kinetic energy?
A. Translational kinetic energy is larger. B. Rotational kinetic energy is larger. C. Both are equal. D. You need to know the speed of the hoop to tell.