How much energy would be required to accelerate a 77. kg professor from rest to 90% the speed of light?
A) 2.3 mc2
B) 0.30 m c2
C) 1.3 m c2
D) 0.41 m c2
E) 0.50 m c2
C
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A light bulb operating at a dc voltage of 120 V has a resistance of 200 ?. How much power is dissipated in this bulb?
A) 100 W B) 60 W C) 72 W D) 14 mW E) 7.2 W
Four particles are positioned on the rim of a circle. The charges on the particles are +0.500 µC, +1.50 µC, -1.00 µC, and -0.500 µC. If the electric potential at the center of the circle due to the +0.500 µC charge alone is 4.50 × 104 V, what is the total electric potential at the center due to the four charges?
1.18.0 × 10^4 V 2.4.50 × 10^4 V 3.0 4.-4.50 × 10^4 V 5.9.00 × 10^4 V
Which statement is true about asteroids? a. All asteroids are found in the asteroid belt between Mars and Jupiter. b. Asteroids are also called dwarf planets
c. Asteroids have an irregular shape and are battered by impact cratering. d. All asteroids have bright, reflective surfaces. e. Asteroids originated from older moons.
Of the following substances, which one contains the highest density of free electrons?
a. glass c. iron b. hard rubber d. amber