For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 13.1 cm. If the focal length is 16.5 cm, what must the index of refraction be?
a. 1.40
b. 1.79
c. 1.52
d. 1.56
e. 1.63
a
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What important molecules of life did Miller and Urey brew up?
A) RNA B) fatty acids C) lean acids D) amino acids E) antacids
The Caloris Basin on Mercury covers a large region of the planet, but few smaller craters have formed on top of it. From this we conclude that
A) erosion destroyed the smaller craters that formed on the basin. B) Mercury's atmosphere prevented smaller objects from hitting the surface. C) only very large impactors hit Mercury's surface in the past. D) the Caloris Basin formed toward the end of the solar system's period of heavy bombardment. E) the Caloris Basin was formed by a volcano.
A particle (mass = 6.7 × 10?27 kg, charge = 3.2 × 10?19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
A. 2.0 kN/C B. 1.5 kN/C C. 1.2 kN/C D. 3.5 kN/C E. 2.4 kN/C
A ball is thrown straight up. Neglecting air resistance, which statement is not true regarding the energy of the ball?
(a) The potential energy decreases while the ball is going up. (b) The kinetic energy decreases while the ball is going up. (c) The sum of the kinetic energy and potential energy is constant. (d) The potential energy decreases when the ball is coming down. (e) The kinetic energy increases when the ball is coming down.