Which of the following statements are true?
(i) When a pulse on a rope reflects from a rigid boundary, it is always inverted.
(ii) When a pulse on rope encounters a second rope (with different characteristics from the first) that is tied to the first one, there is only sometimes a reflected pulse.
1.(i) is true, but (ii) is false
2.(ii) is true, but (i) is false
3.They are both true.
4.They are both false.
1
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Although it hasn't been observed (yet), why do astronomers think that the Milky Way may contain "dark" material?
A. Due to its large size, the light from stars on the other side of the Milky Way has not reached us yet. B. Astronomers have detected neutrinos from unseen sources. C. Theory predicts that there should be more black holes than we've so far detected. D. The Galaxy's gravity seems too big for the mass astronomers can see.
In the periphery of our vision, we are
A) more sensitive to low frequencies than high ones. B) insensitive to color and movement. C) sensitive to movement, but cannot see color. D) sensitive to both movement and color. E) none of the above
Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes
What magnitude force does the 5.0-kg box exert on the 3.0-kg box? A) 0 N B) 10 N C) 25 N D) 40 N E) 50 N
At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2.0 rad/s. Two seconds later it has turned through 5.0 complete revolutions. What is the angular acceleration of this wheel?
a. 17 rad/s2 b. 14 rad/s2 c. 20 rad/s2 d. 23 rad/s2 e. 13 rad/s2