Two water waves meet at the same point, one having a displacement above equilibrium of 50 cm and the other having a displacement above equilibrium of 90 cm. At this moment, what is the resulting displacement above equilibrium?
a. 140 cm
b. 95 cm
c. 40 cm
d. Information about the amplitudes needs to be given to find an answer.
e. 65 cm
a
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Charge of uniform linear density 6.0 nC/m is distributed along the x axis from x = 0 to x = +3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point y = +4 m on the y axis?
A.
B.
C.
D.
E.
A 120-m long copper wire (resistivity 1.68 × 10-8 ? ? m) has resistance 6.0 ?. What is the diameter of the wire?
A) 0.0065 mm B) 0.065 mm C) 0.65 mm D) 0.65 cm E) 0.65 m
You observe a distant galaxy. You find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. What do you conclude?
A) The galaxy is moving away from you. B) The galaxy is moving toward you. C) The galaxy has very weak gravity. D) The galaxy is made purely of hydrogen. E) The composition of the galaxy is changing.
Silver is the metal electrode in a molar solution of Ag+ ions in a standard cell with a reference electrode.
(a) What reactions occur at the two electrodes? (b) What voltage is developed in the cell? (c) What is the Gibbs free energy change per silver ion involved in the reaction?