For constant linear acceleration, the position versus time graph is a
A) horizontal line.
B) vertical line.
C) sloped line.
D) curve.
E) none of the given answers.
D
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A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The spring constant is 390 N/m. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the mass of the tuning fork and block together? The speed of sound at the time of the experiment is 340 m/s.
A. 4.4 kg B. 0.76 kg C. 0.18 kg D. 2.9 kg
Which of the following is (are) invariant(s)?
A. mass B. momentum C. energy D. the speed of light E. mass and the speed of light
Astronomers know the universe is expanding because:
A) everything is moving away from us. B) all stars are moving away from us. C) most galaxies are moving away from us. D) galaxies farther away are moving away from us faster. E) there is a cosmic microwave background.
Capacitance of capacitors depends upon
A) the material between the conductors. B) the geometry of the conductors. C) the space between the conductors. D) all of these answers. E) none of these answers.