Find the speed of an ocean wave whose vertical displacement y as a function of time t is given by y(x,t) = 3.7 cos(2.2x - 5.6t), where all quantities are in SI units
A) 2.5 m/s
B) 1.9 m/s
C) 3.5 m/s
D) 4.5 m/s
Answer: A
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Power: A certain ac signal at 1000 Hz is applied across an inductor and a 100-? resistor. If the power factor of the circuit is 0.400, what is the impedance of this circuit?
A. 150 ? B. 200 ? C. 250 ? D. 100 ? E. 300 ?
The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?
a. Star A is twice the mass of star B.
b. Star B is twice the mass of star A.
c. Star A is ten times the mass of star B.
d. Star B is ten times the mass of star A.
e. Star A and Star B have the same mass.
List at least three qualities that make an astronomical object a good standard candle
What will be an ideal response?
Bulk Modulus: A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?
A. There has been no change in the density of the iron. B. Its density decreases slightly. C. Its density increases slightly. D. Its density becomes 21 times greater than what it was at the surface. E. Its density becomes 1/21 what it was at the surface.