Which of the following alternatives to water has a wider temperature range over which it is a liquid?
A) ammonia
B) methanol
C) methane
D) ethane
B
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Equilibrium: A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.
A. 40 N ? m B. 10 N ? m C. 5.0 N ? m D. 20 N ? m E. 30 N ? m
Nuclear fusion is a process in which
A) atoms combine into molecules. B) two or more light nuclei are combined into a single heavier nucleus. C) a heavy nucleus is split into two or more lighter nuclei. D) a small particle is spontaneously emitted from a nucleus. E) None of the above.
In an electron two-slit experiment, the slits are 15 ?m apart. If the first diffraction maximum lies at an angle of 5.0 × 10-7 rad, what is the momentum of the incoming electrons?
A) 4.4 × 10-23 kg?m/s B) 2.2 × 10-23 kg?m/s C) 11 × 10-23 kg?m/s D) 6.6 × 10-23 kg?m/s E) 8.8 × 10-23 kg?m/s
The total mechanical energy of a simple harmonic oscillator is
A) zero as it passes the equilibrium point. B) zero when it reaches the maximum displacement. C) a maximum when it passes through the equilibrium point. D) a minimum when it passes through the equilibrium point. E) constant.