The first planets around other Sun-like stars were discovered
A) by Huygens, following his realization that other stars are Suns.
B) by Galileo following the invention of the telescope.
C) at the turn of last century.
D) about a decade ago.
E) at the turn of this century.
D
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A force of 120.0 N is applied to 2.000 cm diameter piston in a closed container of water with a density of 1,000 
The force on a piston with a diameter of 25.00 cm is
A. 18,750 N. B. 10,450 N. C. 9,500 N. D. 9,150 N. E. 8,450 N.
What is the resonance frequency of a series ac circuit consisting of a 40.0 ?F capacitor, a 55-? resistor, and a 0.030 H inductor?
A) 0.15 kHz B) 0.9 kHz C) 6.9 kHz D) 6 kHz
Wave frequency could be given in
a. 1/s. b. s-1 c. Hz. d. any of these.
The__________is the spiral galaxy that contains the Sun
A) Andromeda Galaxy B) Cartwheel Galaxy C) Milky Way Galaxy D) Pinwheel Galaxy