Which of the following quantities, if any, remain constant as a projectile moves through its parabolic trajectory?
(i) speed
(ii) acceleration
(iii) the horizontal component of velocity
(iv) the vertical component of velocity
1.(i) only
2.(ii) and (iii)
3.(ii) and (iv)
4.all of them
2
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A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense
(a) For points OUTSIDE the loop, the magnetic field caused by this current A) circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero. (b) For points INSIDE the loop, the magnetic field caused by this current A) circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero. What will be an ideal response?
Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to
A) 4. B) 40. C) 400. D) 4,000. F) 40,000. E) 400,000.
The oldest hominid so far discovered dates back to
A) 540 million years ago B) 65 million years ago C) a few thousand years ago D) 6 to 7 million years ago
Which is larger, a newton or a pound?
a. a newton b. a pound c. This question is nonsense—they don't measure the same physical quantity. d. They are the same size.