Two objects, A and B, are placed on an inclined plane that can be rotated to different angles of elevation. A starts to slide at twice the angle of elevation that B starts sliding. The respective coefficients for static friction for A and B are ?A and ?B. Choose the last answer that is correct
a. ?B > ?A
b. ?A > ?B
c. ?B = 2 ?A
d. ?A = 2 ?B
b
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A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant acceleration?
A) The period does not change. B) The period decreases. C) The period increases. D) The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2. E) The period becomes zero.
If an electron has a measured wavelength of 0.832 × 10^?10 m, what is its kinetic energy? (h = 6.63 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 J, and me = 9.11 × 10^?31 kg)
a. 7640 eV b. 418 eV c. 334 eV d. 218 eV e. 70 eV
A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola c. where it is about to impact b. just when it has started upward d. nowhere
Which of the following does not provide evidence that Mars once had large amounts of liquid water on its surface?
A) the presence of what looks like dried-up riverbeds B) the presence of impact craters that appear to have formed in mud C) the vast canal system described by Percival Lowell D) the presence of minerals, dry clay, and sedimentary rock that form in water E) some very old craters that appear to have been eroded by rain