Radioactivity Basics: When a ?- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus
A. increases by 1.
B. decreases by 1.
C. increases by 2.
D. decreases by 2.
E. does not change.
Answer: E
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Observations of type Ia supernovae reveal that the expansion of the universe is speeding up because of the presence of ___________ in empty space
Fill in the blank(s) with correct word
What happens when a battery is recharged?
a. The negative charge is turned around and made into a positive charge again. b. The cells are turned around and connected in the opposite direction. c. An electric charger runs current backward through the battery and reverses the chemical reactions. d. The electrolyte is poured out and replaced. e. Electric charge is pumped back into the battery to be released again when the charge is used.
A car goes around a curve at 40 m/s. An accelerometer in the car measures the centripetal acceleration of a 2 kg body in the car to be 8 m/s2 . The radius of the curve is __________
Fill in the blank(s) with correct word
The two most abundant elements in Earth's crust are
A) silicates and carbonates. B) silicon and oxygen. C) oxygen and aluminum. D) quartz and feldspar.