For a falling ball the action force is the pull of Earth on the ball. The reaction force is the
A) air resistance acting against the ball.
B) acceleration of the ball.
C) pull of the ball on Earth.
D) nonexistent.
E) none of the above
Answer: C
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The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A) It slowly works its way to the Sun's surface, where it escapes into space. B) It rapidly escapes from the Sun, traveling into space at nearly the speed of light. C) It almost immediately annihilates with an electron, resulting in two gamma-ray photons. D) It quickly meets an ordinary electron, forming an electron-positron pair that remains stable. E) It joins with a nearby neutron to form a proton.
One way astronomers deduce that the Milky Way has a disk is that they
A. see the same number of stars in all directions in the sky. B. see far more stars along the band of the Milky Way than in other directions. C. see a large dark circle silhouetted against the Milky Way in the Southern Hemisphere. D. see stars arranged in a circular region around the north celestial pole. E. None of these choices is correct.
What do the radio pulses within the anticoded message sent in 1974 represent?
a. all the letters in the alphabet b. dots and dashes, like Morse code c. binary numbers, ones and zeroes d. Music, notes and measures e. the numbers one through ten
A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the resistance of the resistor?
A) 100 ? B) 184 ? C) 200 ? D) 552 ? E) 579 ?