Physics, 13.12.2021 07:40 JLapworth1130

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.

Answers: 3

Show answers

Another question on Physics

Physics, 22.06.2019 10:30

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Answers: 2

Answer

Physics, 22.06.2019 15:10

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground

Answers: 3

Answer

Physics, 22.06.2019 18:30

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

Answers: 1

Answer

Physics, 22.06.2019 19:50

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

Answers: 3

Answer

You know the right answer?

Carl uses energy from a fully charged battery pack to light up a high efficiency light bulb, which c...

Questions