Carl uses energy from a fully charged battery pack to light up a high efficiency light bulb, which converts about 80\%80%80, percent of its electrical energy into light. After an hour, the battery pack is no longer full. He also notices that the temperature of air near the light bulb has risen slightly. What happened to the energy from the battery pack?
(Choice A)
A
It mostly transformed into light energy, and a small portion disappeared.

(Choice B)
B
It transformed into light energy and thermal energy in equal portions.

(Choice C)
C
It mostly transformed into light energy, and a small portion transformed into thermal energy.

(Choice D)
D
It mostly transformed into heat, and a small portion transformed into light energy.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you