The Garfield Thomas water tunnel at Pennsylvania State University has a circular cross-section that constricts from a diameter of 3.6 m to the test section, which is 1.2 m in diameter. If the speed of flow is 2.0 m/s in the large-diameter pipe, determine the speed of flow in the test section
a. 9.0 m/s
c. 27 m/s
b. 18 m/s
d. 1.0 m/s
B
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You chemically analyze a small sample of a meteorite. K-40 and Ar-40 are present in a ratio of approximately 1.65 units of K-40 atoms to 8.35 units of gaseous Ar-40 atoms
How old is the meteorite given the half-life of this decay is 1.25 billion years? A) 1.25 billion years B) 5.00 billion years C) 2.75 billion years D) 3.25 billion years
The average distance of the electron from the proton in the hydrogen atom is 0.65 × 10^?10 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99 × 10^9 N/m2/C2, e = 1.6 × 10^?19 C)
a. 3.4E+11 N/C b. 5.4E+6 N/C c. 5.2E+1 N/C d. 2.2E–8 N/C e. 1.0E–8 N/C
Electric potential energy is measured in
1) amperes. 2) volts. 3) joules. 4) watts and electric potential is measure in 5) amperes. 6) volts. 7) joules. 8) watts
What happens to a star's core as the hydrogen there is used up?
A. Nothing. It just turns to helium. B. It contracts and cools. C. It contracts and heats. D. It expands and cools. E. As the helium accumulates, the core rises to the surface of the star and escapes into space.