A sample of radium-226 will decay to ¼ of its original amount after 3200 years. What is the half-life of radium-226?

years?

An eagle flies from its perch in a tree to the ground to capture it's prey. describe it's energy transformations.

What will occur if a resistor with high resistance is inserted into a circuit? A.) There will be a high voltage drop across it. B.) There will be a low voltage drop across it. C.) There will be a high current drop across is. D.

Why are meteorites of primitive material considered more important than other meteorites? Why have most of them been found in Antarctica?

Thought Experiment: Now imagine that you were to dump the iron off the side of the boat, would more water be displaced be when the iron was on the boat or when the iron was dumped overboard and now sits in the bottom of the ocean?

How does the phrase studying grammar function in sentence 4? A) main verb B) direct object C) subject complement D) subject of the sentence. Subject

Anna bought a tangle fish and two rainbow fish for her aquarium the rainbow fish cost $6 more than the angelfish if she paid a total of $37 what is the cost of the angel fish

Suppose that the entire Universe began to contract (collapse) right now. Five billion years from now, an astronomer looking at the spectra of galaxies. What would be the changes noted? A.

Which of the following statements about the atom is false?

Explain why models are often used to study other planets.

The main factors that affect an area's temperature are prevailing winds and mountains. a. True b. False