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

Author Question: Which light source is more energy-efficient? A) a fluorescent lamp B) an incandescent lamp C) a ... (Read 343 times)

kwoodring

  • Hero Member
  • *****
  • Posts: 560
on: Jul 29, 2018
Which light source is more energy-efficient?
 
  A) a fluorescent lamp
  B) an incandescent lamp
  C) a CFL
  D) an LED

Question 2

A carpenter is driving a nail into a board. The 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Assume that half of the kinetic energy of the hammer is transformed into heat in the 15.0-g steel nail and does not flow out.
 
  What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/(kgK). A) 8.1 K
  B) 3.6 K
  C) 1.8 K
  D) 2.7 K
  E) 7.7 K


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yahahah24021

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: D

Answer to Question 2

A


kwoodring

  • Member
  • Posts: 560
Reply 2 on: Jul 29, 2018
Wow, this really help

smrtceo

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Energy flow and chemical recycling in ecosystems. Energy flow and chemical recycling in ecosystems.
Brain cells of a laboratory mouse are shown glowing with multicolor fluorescent proteins Brain cells of a laboratory mouse are shown glowing with multicolor fluorescent proteins
A fluorescent trouble light operates cooler and is safer to use in the shop because it is protected ... A fluorescent trouble light operates cooler and is safer to use in the shop because it is protected ...
Place a towel or sheet over knee area. Use a thin barrier to protect skin from cold source. Place a towel or sheet over knee area. Use a thin barrier to protect skin from cold source.
Resonance transfer of energy in a light-harvesting complex Resonance transfer of energy in a light-harvesting complex
Light in air is initially traveling parallel to the face AC of an equilateral triangular prism, ... Light in air is initially traveling parallel to the face AC of an equilateral triangular prism, ...
Video: Interpreting a cladogram Animation

For a complete list of videos, visit our video library