What is the speed of a proton that has been accelerated from rest through a potential difference of 4.0 kV?
a. 1.1 × 10^6 m/s
b. 9.8 × 10^5 m/s
c. 8.8 × 10^5 m/s
d. 1.2 × 10^6 m/s
e. 6.2 × 10^5 m/s
C
Physics & Space Science
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An ideal gas composed of helium atoms is at a pressure of 2.00 atmospheres and a temperature of 35.0 
What is the mass density? (He = 4.00u)
A. 0.534 
B. 0.488
C. 0.400
D. 0.316
E. 0.276
Physics & Space Science
Write the balanced chemical equation for the complete combustion of pentane, C5H12
Physics & Space Science
Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs
A) current. B) voltage. C) resistance.
Physics & Space Science
A floating leaf oscillates up and down twice in 1 s as a water wave passes by. What is the wave's frequency?
A) 0.5 Hz B) 1 Hz C) 2 Hz D) 3 Hz E) 6 Hz
Physics & Space Science