Americium-243 has a decay constant of 9.39 10-5 years-1. How ...

[Ebrown]

Americium-243 has a decay constant of 9.39  10-5 years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
 
  A) 2960 s
  B) 10.6  103 years
  C) 4.32  103 years
  D) 6.44  103 years
  E) 7.84  103 years

Question 2

A 50.0-kg block is being pushed up a 15.0 slope by a force of 300 N which is directed 30.0 below the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
 
  A) 0.164 m/s2
  B) 0.967 m/s2
  C) 1.20 m/s2
  D) 2.20 m/s2
  E) 0.528 m/s2

[wuly]

Answer to Question 1

C

Answer to Question 2

A

[Ebrown]

Great answer, keep it coming

[amandalm]

Gracias!