Four waves are described by the following equations, where distances are measured in meters and times in seconds
I. y = 0.12 cos(3x - 21t)
II. y = 0.15 sin(6x + 42t)
III. y = 0.13 cos(6x + 21t)
IV. y = -0.23 sin(3x - 42t)
Which of these waves have the same speed?
A) I and II
B) I and III
C) II and III
D) III and IV
E) II and IV
A
You might also like to view...
The correct sequence of spectral type letters from hot on the left to cool on the right is
a. M, K, G, F, A, B, O b. O, B, A, F, G, K, M c. G, K, M, F, O, B, A d. A, B, O, F, G, K, M
Coulomb's Law: The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the x component of the electrostatic force on the -9.0 ?C charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. -0.55 N B. 0.55 N C. 0.64 N D. 0.41 N E. -0.41 N
A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will
A) be behind the package. B) be over the package. C) be in front of the package. D) depend of the speed of the plane when the package was released.
Where, do you feel, is the greatest possible source of error in this experiment? Why?