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

Author Question: The approximate daily energy consumption of primitive humans (before fire) was about a. 2000 ... (Read 57 times)

skymedlock

  • Hero Member
  • *****
  • Posts: 561
on: Jul 28, 2018
The approximate daily energy consumption of primitive humans (before fire) was about
 
  a. 2000 kilojoules.
  b. 8000 kilojoules.
  c. 12,000 kilojoules.
  d. 48,000 kilojoules
  e. 400,000 kilojoules.

Question 2

A stay-at-home mom watches soap operas for 1.5 h each day and her husband vegges out in front of the tube for around 2 h a night.
 
  He also watches the football games on Saturday and Sunday during football season (two games each day, 6 hours of watching). How much does this family pay to watch TV every year? Assume the cost of electricity is 0.08/kWh.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bblaney

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

We assume from the description that this is the weekday ritualwatching the TV
for a total time of 3.5 h. From Table 8.7, we use 200 W as the power drawn by the TV. So,
we find 5 d x 3.5 h/d x 200 W = 3500 Wh = 3.5 kWh. Weekend watching totals 12 h, so
energy use from the weekend totals 200 W x 12 h = 2400 Wh = 2.4 kWh. Total weekly
energy use is 5.9 kWh. The cost is 5.9 kWh x 0.08/kWh = 0.47.


skymedlock

  • Member
  • Posts: 561
Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

cici

  • Member
  • Posts: 325
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

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.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

The composition of DNA sequences that are found in the nuclear genome of humans The composition of DNA sequences that are found in the nuclear genome of humans
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
An ABC fire extinguisher is safe for most fires. An ABC fire extinguisher is safe for most fires.
Effect of the activation energy barrier. Effect of the activation energy barrier.
Metabolic pathways involved in lipolysis, the breakdown of fats (triglycerides) for energy. Metabolic pathways involved in lipolysis, the breakdown of fats (triglycerides) for energy.
Locations of key energy meridians and acupoints for the back, shoulder, arm, neck, head, and face. Locations of key energy meridians and acupoints for the back, shoulder, arm, neck, head, and face.
Video: Epidural Hematoma

For a complete list of videos, visit our video library