Process of Science: The existence of brown dwarfs was predicted for decades before their discovery in 1995. Why did it take so long?
What will be an ideal response?
Brown dwarfs are very faint, especially at optical wavelengths. It required new instrumentation that could see faint objects at infrared wavelengths before we could see brown dwarfs. The theory had to wait for the technology to advance to a state where it could test its predictions.
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The mixing of which pair of the following atoms does not occur by vacancy diffusion?
(a) Gold and silver (b) Copper and nickel (c) Platinum and palladium (d) Hydrogen and palladium
A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity when the projectile hits the ground?
A. Vx = 35.7 m/s, Vy = -22.5 m/s B. Vx = 39.0 m/s, Vy = -22.5 m/s C. Vx = 35.7 m/s, Vy = -39.0 m/s D. Vx = 39.0 m/s, Vy = -35.7 m/s E. Vx = 22.5 m/s, Vy = -22.5 m/s
A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct?
a. The negative charge remains on the metal sphere. b. The negative charge spreads over the outside surface of the bucket and cover. c. The negative charge spreads over the inside surface of the bucket and cover. d. The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. e. The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.
The sky is dark at night:
A) because the stars in the Milky Way are far away. B) because the Sun is on the other side of Earth. C) because there are far fewer stars on the night side of Earth. D) because all the light from all the objects in the universe hasn't arrived here yet. E) because the quasars are too far away from Earth for their light to have arrived here.