« previous next »

Author Question: The temperature coefficient of resistivity of iron is 5.0 10-3 / C; that of carbon is -0.50 10-3 / ... (Read 120 times)

Destiiny22

  • Hero Member
  • *****
  • Posts: 557
on: Jul 28, 2018
The temperature coefficient of resistivity of iron is 5.0  10-3 / C; that of carbon is -0.50  10-3 / C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20C, are cooled from that temperature to -80C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
 a. -0.10.
  b. +1.9.
  c. +2.1.
  d. -10.
  e. +10.

Question 2

If a mile of 24-gauge copper wire has a resistance of 0.14 kW and the resistivity of copper is 1.7  10-8 W  m, what is the diameter of the wire? (1 mile = 1.6 km)
 a. 0.40 mm
  b. 0.50 mm
  c. 0.63 mm
  d. 0.80 mm
  e. 0.25 mm


juicepod

  • Sr. Member
  • ****
  • Posts: 310
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Translational regulation of ferritin mRNA by the iron regulatory protein (IRP) Translational regulation of ferritin mRNA by the iron regulatory protein (IRP)
iron iron
iron iron
Temperature and Color Temperature and Color
Temperature Means and Ranges Temperature Means and Ranges
Brown Bread contains calcium, phosphorous, potassium, iron, magnesium and sodiu Brown Bread contains calcium, phosphorous, potassium, iron, magnesium and sodiu
Video: Brief Summary on Photosynthesis - Animation

For a complete list of videos, visit our video library