Briefly explain how antimatter can be produced on Earth.
What will be an ideal response?
Answer: Antimatter is produced in particle accelerators. When particles collide and release large amounts of energy in one place, some of the energy spontaneously turns into mass. This mass must contain particles and their antiparticles in equal quantities.
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A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average acceleration during this time interval?
A. 0.37 
B. 0.50
C. 0.62
D. 0.87
The Sun's habitable zone
A) extends from some place a little beyond the orbit of Venus to some place near the orbit of Mars. B) consists only of Earth, because Earth is the only planet known to be inhabited. C) extends from the orbit of Earth to the orbit of Jupiter. D) extends from just beyond the orbit of Mercury to just beyond Earth's orbit.
Why can't you directly observe, with the unaided eye, Brownian motion in easily visible objects such as floating bits of paper?
A) Because atoms are so small that you can't see them with the unaided eye. B) Because only individual atoms and molecules exhibit Brownian motion. C) Because bits of paper are so massive [or heavy] that they do not respond noticeably to atomic impacts. D) Because paper cannot be electrically charged, so it cannot respond to Brownian forces by individual atoms. E) Because only living organisms such as bacteria exhibit Brownian motion.
We live in the epoch called the
a. Quaternary. b. Ordovician. c. Holocene. d. Cenozoic.