If you pound a feather with a hammer, which one feels a greater force?
A) always the feather
B) always the hammer
C) The size of the force is always exactly the same on both of them.
D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
Ans: C) The size of the force is always exactly the same on both of them.
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An object’s x-velocity vx (t) is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its x-position?
A. A
B. B
C. C
D. D
E. E
Sirius has a parallax of 0.38", while Alpha Centauri's is 0.77." Alpha Centauri is about ________ as Sirius
Fill in the blank(s) with correct word
Two rectangular loops of wire lie in the same plane as shown in Figure OQ31.11. If the current I in the outer loop is counterclockwise and increases with time, what is true of the current induced in the inner loop? More than one statement may be correct
1.It is zero.
2.It is clockwise.
3.It is counterclockwise.
4.Its magnitude depends on the dimensions of the loops.
5.Its direction depends on the dimensions of the loops.
Which of the following is not one of the three main strategies used to measure the mass of a galaxy clusters?
A) measuring the speeds of galaxies orbiting the cluster's center B) studying X-ray emission from hot gas inside the cluster C) observing how the cluster bends light from galaxies located behind it D) measuring the temperatures of stars in the halos of the galaxies