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 92 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
Wow, this really help

ASDFGJLO

  • Member
  • Posts: 335
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Green tea is able to stop the scent of garlic or onion from causing bad breath.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Ecological pyramids in food webs. Ecological pyramids in food webs.
Frequent dining on fast food, which tends to be higher in fat and carbohydrates, may be convenient ... Frequent dining on fast food, which tends to be higher in fat and carbohydrates, may be convenient ...
The Epiglottis The epiglottis prevents food from entering the trachea when you swallow The Epiglottis The epiglottis prevents food from entering the trachea when you swallow
Plot of land (Part a) Plot of land (Part a)
Plot of land (Part b) Plot of land (Part b)
Plot of Land (Modified Offset Method) Plot of Land (Modified Offset Method)
Video: Structures that affect circulation - heart and MABP

For a complete list of videos, visit our video library