Author Question: A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min? ... (Read 110 times)

JGIBBSON

  • Hero Member
  • *****
  • Posts: 538
A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
 
  A) 1/32 B) 1/8 C) 1/2 D) 1/4 E) 1/16

Question 2

A firecracker breaks up into two pieces, one has a mass of 200 g and flies off along the x-axis with a speed of 82.0 m/s and the second has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s.
 
  What is the total momentum of the two pieces? A)
 
  361 kgm/s at 56.3 from the x-axis
  B)
 
  93.5 kgm/s at 28.8 from the x-axis
  C)
 
  21.2 kgm/s at 39.5 from the x-axis
  D)
 
  361 kgm/s at 0.983 from the x-axis
  E)
 
  21.2 kgm/s at 56.3 from the x-axis


TheNamesImani

  • Sr. Member
  • ****
  • Posts: 334
Answer to Question 1

E

Answer to Question 2

C



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

For a complete list of videos, visit our video library