Projectile Motion: An athlete participates in an interplanetary discus throw competition during an Olympiad that takes place on a planet where the acceleration due to gravity is 9.7 m/s2. He throws the discus with an initial velocity of 20 m/s at an angle of 60° from the vertical. Neglecting air resistance and the height of the discus at the point of release, what is the range of the discus?
A. 21 m
B. 60 m
C. 36 m
D. 40 m
E. 32 m
Answer: C
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Conservation of Momentum: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)
A. The momentum of the truck is conserved. B. The momentum of the car is conserved. C. The car and the truck must undergo the same change in speed. D. The momentum of the car and the momentum of the truck are each conserved. E. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.
A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
A.
.B.
.C.
D.
E.
A proton consists of 3 quarks, two with charge +2e/3 and one with charge –e/3 . Of the following, which is closest to the approximate potential energy of the arrangement of the two positive quarks if they are separated by 10–15 m?
a. 1 MeV c. 1012 MeV b. 10–19 MeV d. 100 MeV
The process in which one plate bends and descends beneath another plate is called
A) subduction. B) seduction. C) segregation. D) sinking.