A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground. At what angle below the horizontal does the ball approach the ground?
A) 35°
B) 42°
C) 48°
D) 40°
E) 65°
C
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A circular loop carrying a current of 2.0 A is in a magnetic field of 3.5 T. The loop has an area of 0.12 m2 and its plane is oriented at a 37° angle to the field. What is the magnitude of the magnetic torque on the loop?
A) 0.10 m?N B) 0.51 m?N C) 0.67 m?N D) 21 m?N E) 46 m?N
Force F (see figure) is applied at C and is directed toward A. Its magnitude is F = 15 N. A unit vector along line CA is:
(A) -0.49i + 0.81j + 0.32k
(B) -0.5li + 0.73j + 0.39k
(C) 0.58i - 0.79j + 0.49k
(D) -0.65i + 0.22j + 0.43k
As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells. B) a nova explosion. C) iron 56. D) cobalt 56. E) nickel 56.
An airplane flying with a constant speed flies from a warm air mass into a cold air mass. The Mach number (the ratio of the speed of the airplane to the speed of sound) will:
a. increase. c. stay the same. b. decrease. d. become unstable.