Author Question: Americium-243 has a decay constant of 9.39 10-5 years-1. How long will it take for a sample of ... (Read 45 times)

Ebrown · **on:** Jul 29, 2018

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