Radioactivity Basics: A sodium-22 nucleus, 
Na, decays into a neon-22 nucleus, 
Ne, and one other particle. What is the other particle?
Fill in the blank(s) with the appropriate word(s).
?+ (or a positron)
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High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact
When a gun is fired, which has the greater kinetic energy: the bullet or the recoiling gun?
What will be an ideal response?
Briefly explain what we mean by the statement "The farther away we look in distance, the further back we look in time."
What will be an ideal response?
If we went back in time 10 billion years, would we expect Hubble's constant to be identical to the present-day Hubble constant?
A) Yes, a constant never changes. B) No, Hubble's constant is roughly equal to 1 divided by the age of the universe, and 10 billion is a substantial enough number to notice a difference. C) If we went back further in time, it would be different, but 10 billion years is not enough. D) It would only change if we went 10 billion years into the future.