The allowed shapes for orbits under the force of gravity are
A) ellipses only.
B) ellipses and spirals.
C) ellipses, parabolas, and hyperbolas.
D) ellipses, spirals, and parabolas.
E) spirals, circles, and squares.
C
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An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 800 K?
(The Boltzmann constant is 1.38 × 10-23 J/K, the molecular weight of oxygen is 32.0 g/mol, and Avogadro's number is 6.022 × 1023 molecules/mol.) A) 31.8 km B) 10.6 km C) 21.1 km D) 42.3 km
Evidence for the existence for Pangaea includes
a. biological evidence only. b. continuity of geologic features only. c. glacial evidence only. d. all of the above.
Conservation of Momentum: A 1200-kg cannon suddenly fires a 100-kg cannonball at 35 m/s. What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally.
A. 2.9 m/s B. 35 m/s C. 3.5 m/s D. 3.2 m/s
Two objects of equal mass hit a wall with the same velocity. They both rebound with the same velocity. Both objects experience the same momentum change but one experiences twice the force as the other. Which of the following statements is true?
A. the contact time between the object and the wall of one is twice the contact time of the other B. the contact time between the object and the wall of one is equal to the contact time of the other C. the contact time between the object and the wall of one is one-half the contact time of the other D. the change in the kinetic energy is the same for the two objects E. the contact time between the object and the wall of one is 1/3 the contact time of the other