This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and ... (Read 70 times)

ereecah

  • Hero Member
  • *****
  • Posts: 530
on: Jul 29, 2018
A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy-efficient is this bulb as a producer of light?
 
  A) 400 B) 20 C) 25 D) 500 E) 80

Question 2

A 3.0-kg object and a 5.0-kg object hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the objects are gently released from rest, how long does it take for the 3.0-kg objects to rise by 1.0 m?
 
  A) 0.41 s
  B) 0.74 s
  C) 0.82 s
  D) 1.8 s
  E) 0.90 s


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

GCabra

  • Sr. Member
  • ****
  • Posts: 331
Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

E


ereecah

  • Hero Member
  • *****
  • Posts: 530
Reply #2 on: Jul 29, 2018
TY


GCabra

  • Sr. Member
  • ****
  • Posts: 331
Reply #3 on: Jul 29, 2018
You're welcome


« previous next »
 

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Absorption of light energy by an electron Absorption of light energy by an electron
A Hall-effect sensor produces a digital on-off voltage signal whether it is used with a blade or a ... A Hall-effect sensor produces a digital on-off voltage signal whether it is used with a blade or a ...
Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ... Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ...
Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ... Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ...
The oceans have absorbed 90% of excess energy The oceans have absorbed 90% of excess energy
Generating Energy from Glucose When your body needs to break down glucose Generating Energy from Glucose When your body needs to break down glucose
Video: Oxygen transport - methods and oxyhemoglobin

For a complete list of videos, visit our video library