Which of these stars lies closest to the north celestial pole on the celestial sphere?
A) Deneb
B) Alpha Centauri
C) Spica
D) Sirius
A
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A 70.0-kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.04 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?
a. 700 N c. 8000 N b. 4000 N d. 16,000 N
Arriving at a conclusion based upon one's observations is known as:
a. inductive reasoning b. deductive reasoning c. critical thinking d. logic e. the scientific method
The length 4.221 cm is added to 0.01 cm. The appropriately rounded sum is
A. 4.22 cm. B. 4.2301 cm. C. 4.23 cm. D. 4.2 cm. E. 4.21 cm.
In the hypothetical atomic interaction shown in figure C9.13, suppose that initially the system’s kinetic energy is 
at an initial separation of 0.1 nm. About how much energy would we have to add to the system for the atoms to fly off to infinite separation?
A. 1 × 10-21 J B. 6 × 10-21 J C. 11 × 10-21 J D. 16 × 10-21 J E. None. The atoms will do so without adding energy.