Light travels faster in
A) thin air.
B) dense air.
C) same in each.
Answer: A
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We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of +20 µC at the center of the sphere through a hole in the surface. Find the electric field present at a point 10 cm from the sphere's center. (ke = 8.99 × 10^9 N/m2/C2)
a. 3.6E+7 N/C b. 9.0E+6 N/C c. 1.8E+7 N/C d. 4.5E+6 N/C e. 2.7E+7 N/C
According to Kepler's third law, a planet's orbital period ____________________ is equal to its average distance from the Sun ____________________
Fill in the blank(s) with correct word
A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude force acting on the proton?
A) 8.0 × 10-15 N B) 3.9 × 10-15 N C) 2.6 × 10-15 N D) 0 N E) 1.3 × 10-15 N
A drop in pressure is an indication of
A) an approaching cold front. B) orographic lifting. C) adiabatic expansion. D) a stationary front.