Measuring the amount of deuterium in the universe allows us to set a limit on
A) the density of ordinary (baryonic) matter the universe.
B) the total amount of mass in the universe.
C) the acceleration of the universe.
D) the current age of the universe.
A) the density of ordinary (baryonic) matter the universe.
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Which of the following is true of O and B associations?
A) Their parallax can be easily measured. B) They are bad spiral tracers. C) Their distance is usually found by spectroscopic parallax. D) They reveal parts of six spiral arms near the Sun.
A pool player is attempting a fancy shot. He hits the cue ball giving it a speed of 5.57 m/s and directs its center on a path tangent to the surface of the target ball having the same mass as the cue ball
After the collision (on a frictionless table) the initially-stationary ball moves with a speed of 4.82 m/s. After the collision, the new speed of the cue ball and the relative direction of the balls are closest to A) 2.79 m/s, at 90° to each other. B) 2.79 m/s, at 60° to each other. C) 8.34 m/s, at 90° to each other. D) 8.34 m/s, at 60° to each other.
Radio telescope to know about:
What will be an ideal response?
An object is placed 100 cm in front of a lens of focal length 50 cm. A lens of focal length -20 cm is placed 90 cm beyond the first lens. The final image is located
A) 10 cm in front of the second lens. B) 20 cm past the second lens. C) 17 cm past the second lens. D) 10 cm past the second lens. E) 20 cm in front of the second lens.