The x-component of motion of an object is given by x(t) = Axcos(?xt + ?x) and the y-component of motion of the object is given by y(t) = Aycos(?yt + ?y)
What relationships between the A,?, and ? parameters must be true so that the motion of the object is on a circle? A)
Ax = Ay, ?x = ?y, and ?x = ?y
B)
Ax = ±Ay, ?x = ±?y
C)
Ax = ±Ay, ?x = ?y, and ?x = ?y ± ?/2
D)
Ax = Ay, ?x = ±?y, and ?x = ?y
E)
Ax = ±Ay, ?x = ±?y, and ?x = ?y ± ?/2
E
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Melanie says that when a diver enters an underwater cave of height y, the pressure on her is no greater than ?Wgy. Rosalind says that if the bottom of the cave is a distance Y below the water surface, the pressure on the soles of the diver's feet can reach ?WgY. Which one, if either, is correct? (The density of water is ?W.)
A. Melanie, because the roof of the cave absorbs the water pressure from above. B. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. C. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. D. Rosalind, because the pressure also depends on ?c, density of the material above the cave roof, so that p =?cg(Y-y) +rWgy. E. Melanie, because the pressure equals p = ?WgH??cg(H?h).
The element ______________ was the gas used in the Hindenburg
Fill in the blank(s) with correct word
Two windowpanes are being compared for their heat conduction. The second windowpane has twice the width, twice the height, and twice the thickness of glass of the first windowpane.How would the heat flow through the second windowpane compare to that of the first
a. They both would have the same amount. b. The second one would have double that of the first. c. The second one would have quadruple that of the first. d. The second one would have eight times that of the first.
Star A has an apparent visual magnitude of 13.4 and star B has an apparent visual magnitude of 15.4 . Star A is ____ than star B
a. 2 times fainter b. 2 times brighter c. 6.3 times fainter d. 6.3 times brighter e. 29.8 times fainter