As a tungsten light bulb ages, it gets dimmer due to a lower current in the filament. Which statement below describes a possible cause for this lower current? A. Tungsten evaporates from the filament, decreasing the cross-sectional area, thus decreasing the resistance.
B. Tungsten evaporates from the filament, decreasing the cross-sectional area, thus increasing the resistance.
C. Tungsten expands, increasing the length of the filament, thus decreasing the resistance
D. Tungsten shrinks, decreasing the length of the filament, thus increasing the resistance.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Ahorizontal force of 400.0 n is required to pull a 1760 n truck across the floor at a constant speed. find the coefficient of sliding friction.