A single bar of soap has a small light attached. The bar is released in a river and a snapshot is taken every second from a blimp which is stationary over the river. The snapshots are all superimposed on one large picture. The line formed by connecting the dots is:
(A) A streamline
(B) A streakline
(C) A pathline
(D) A line that has not been defined
D) A line that has not been defined
The line does not satisfy any of the definitions of a streamline, a streakline, or a pathline.
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Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature. C) Galaxy collisions destroy most of the stars in the galaxies involved. D) Irregular galaxies rarely have star formation taking place in them. E) Most galaxies appear to be approaching the Milky Way Galaxy.
If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave with the largest amplitude is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
If the index of refraction for a silica glass fiber is 1.46, which of the following of refraction indices for a coating would produce total internal reflection?
(a) 1.30 (b) 1.46 (c) 1.50 (d) 1.60