A 10.0-kg picture is held in place by two wires, the first one ...

[Alainaaa8]

A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0 to the left of the vertical and the second one at 45.0 to the right of the vertical. What is the tension in the first wire?
 
  A) 69.6 N
  B) 50.8 N
  C) 98.1 N
  D) 69.4 N
  E) 23.8 N

Question 2

The half-lives of cobalt-60 and strontium-90 are 5.3 years and 28 years respectively. Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity.
 
  What will be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There will be more strontium-90 than cobalt-60 nuclei.
  B) There will be equal numbers of cobalt-60 and strontium-90 nuclei.
  C) There will be more cobalt-60 than strontium-90 nuclei.
  D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.

[lkoler]

Answer to Question 1

A

Answer to Question 2

A

[Alainaaa8]

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[lkoler]

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