Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1. 25 billion years
By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock? A) 1.25 billion years
B) 2.5 billion years
C) 3.75 billion years
D) 5.0 billion years
C
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Where are most elements heavier than hydrogen and helium made?
A) in the gas between the stars B) in the cores of stars, in supernovae, and during neutron star mergers C) All elements were made about 5 minutes after the universe began. D) in the cool atmospheres of red giant stars E) in white dwarfs
The greenhouse effect is contributing significantly to the observed warming of Earth
a. True b. False Indicate whether the statement is true or false
What are the minimum and maximum values for right ascension in the sky?
What will be an ideal response?
Components: A vector 
has components Ax = 12.0 m and Ay = 5.00 m.(a) What is the angle that vector 
makes with the +x-axis?(b) What is the magnitude of vector 
?
Fill in the blank(s) with the appropriate word(s).