When a light beam emerges from water into air, the average light speed
A) increases.
B) decreases.
C) remains the same.
Answer: A
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A block is on a frictionless table, on earth. The block accelerates at 3.0 m/ when a horizontal force is exerted on it
The block and table are set up on the Moon, where the acceleration of objects due to the gravitational attraction is 1.62 m/ . The weight of the block on the Moon is closest to A) 11 N. B) 9.5 N. C) 8.1 N. D) 6.8 N. E) 5.5 N.
Thin Lenses: An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A. -0.10 B. 0.10 C. 0.15 D. 0.20 E. -0.20
The brightest stars in aging globular clusters will be
A) blue supergiants like Rigel and Deneb. B) massive blue main-sequence stars like Spica. C) blue stragglers. D) red supergiants like Betelgeuse and Antares. E) core stars of planetary nebulae.
Earth and Venus have more substantial atmospheres because they are larger and had more volcanic activity.
Answer the following statement true (T) or false (F)