Light passes from medium one 
to medium two 
If v1< v2 then at the boundary
A. f increases 
decreases.
B. f does not change, 
increases.
C. f decreases, 
increases.
D. f does not change, 
decreases.
C. f decreases, increases.
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A long horizontal wooden beam supported at its ends sags when you sit in the middle. Due to bending, the top part of the beam is under
1) tension. 2) compression. And the bottom of the beam is under 3) tension. 4) compression. And the part of a beam where no tension or compression occurs 5) along the center of the beam. 6) along the neutral layer. 7) both of these 8) none of these
The acceleration of objects due to the gravitational force exerted on them is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A) Mass is less, weight is the same. B) Mass is the same, weight is less. C) Both mass and weight are less. D) Both mass and weight are the same.
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.4 × 1019 kg B) 4.8 × 1019 kg C) 1.2 × 1020 kg D) 2.4 × 1020 kg E) 4.8 × 1020 kg
Elementary Particles: The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A. uud B. ddu C. udd D. ttb E. bst