If the distance between Earth and a star is measured using parallax measurements, how far apart in time should the two measurements be made to make the parallax measurement as accurate as possible?
A. a day
B. six months
C. a year
D. instantaneously
Answer: B
You might also like to view...
Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it
A) increases. B) decreases. C) remains nearly the same.
A spaceship captain lands on an unknown planet. Before venturing forth, he needs to find out the free fall acceleration on that planet
All he has available to him is some thin light string, a stopwatch, and a small 2.75-kg metal ball (it was a rough landing). So he lets the ball swing from a 1.5-m length of the string, starting at rest, and measures that it takes 1.9 s for it to swing from the place where he released it to the place where it first stops as it reverses direction. What is the free fall acceleration on this planet?
The particle that orbits the central core inside an atom is the
a. electron b. proton c. neutron d. nucleus e. none of the above
One of Neptune's moons produces _______________ in the outermost ring
Fill in the blank(s) with correct word