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

Author Question: One of the radioactive isotopes that fell on the land and got into the food chain after the ... (Read 83 times)

saliriagwu

  • Hero Member
  • *****
  • Posts: 537
on: Jul 29, 2018
One of the radioactive isotopes that fell on the land and got into the food chain after the Chernobyl accident was 131I. Its half-life is 8 days.
 
  How long was it, following its deposit on the land, before its radioactivity had fallen to 1/32--about 3--of its initial value?
  A) 16 days
  B) several years
  C) 48 days
  D) 40 days
  E) It is impossible to say, even approximately.

Question 2

A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s.
 
  (a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension force that the string exerts on the ball.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mochi09

  • Sr. Member
  • ****
  • Posts: 335
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

(a) 79.0 m/s2 toward the center of the circle (b) 13.8 N


saliriagwu

  • Member
  • Posts: 537
Reply 2 on: Jul 29, 2018
:D TYSM

apple

  • Member
  • Posts: 352
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

This moose exploits the twigs and buds of woody plants for the food it needs to survive a cold north This moose exploits the twigs and buds of woody plants for the food it needs to survive a cold north
Palpation of Lymph Nodes, Anterior Cervical Chain Palpation of Lymph Nodes, Anterior Cervical Chain
Many countries do not produce enough food and need to import food from the United States Many countries do not produce enough food and need to import food from the United States
Sustainable Food Systems Model Sustainable Food Systems Model
Who's Policing the Food Supply? Who's Policing the Food Supply?
A very small sampling of organisms in an arctic food web on land. A very small sampling of organisms in an arctic food web on land.
Video: Hierarchical Sequencing Method - Sequence Tagged Sites

For a complete list of videos, visit our video library