Consider two vertical tubes of equal cross-section area, one containing water and the other mercury. If the liquid pressures at the bottom of the tubes are equal, both liquids would have equal
A) volumes.
B) densities.
C) weights.
D) number of molecules.
E) none of the above
Answer: C
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What happens to an electron's wave packet if an accurate velocity measurement is performed?
A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity. B) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position. C) It suddenly changes to a new wave packet having small uncertainties in both velocity and position. D) Neither the wave packet nor the electron is affected by the measurement. E) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.
A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.45 m/s2 c. 28 m/s2 b. 0.60 m/s2 d. 14 m/s2
Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Explain how the specific heats of materials are measured using the technique of calorimetry
What will be an ideal response?