The analysis of Martian rocks on Earth show that they contain
A) tantalizing but unconfirmed hints of life.
B) bacteria with closely related DNA to bacteria on Earth.
C) bacteria with very different DNA from bacteria on Earth.
D) water ice.
E) chemical byproducts of life.
A
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Lonnie pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball?
a. 360 N•s c. 400 N•s b. 20 N•s d. 15 N•s
Potential of Point-Charges: Three point charges, -2.00 ?C, +4.00 ?C, and +6.00 ?C, are located along the x-axis as shown in the figure. What is the electric potential (relative to infinity) at point P due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. -307 kV B. +307 k V C. -154 kV D. +154 kV E. 0.00 kV
"Hybrid drive" automobiles use
A) hydrogen fuel that burns much like gasoline within an engine that drives the wheels. B) natural gas fuel stored at high pressure. C) a small gasoline engine that drives an electric generator. D) large storage batteries that are recharged by plugging them into a wall socket. E) small batteries that energize a small gasoline engine that drives the wheels.
Lower frequency radio waves are reflected back to Earth by the ______________
Fill in the blank(s) with correct word