Sirius, the brightest star in the night sky, is actually a binary star system. Sirius a is main-sequence star and sirius b is a white dwarf. Nearly all the visible light we see from sirius comes from sirius a. But when we photograph the system with x-ray light, as shown here, sirius b is the brighter of the two stars. Why?.

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?