When a rainbow is seen as a complete circle from an airplane, the airplane's shadow is
A) in the center of the rainbow.
B) in the lower part of the rainbow.
C) in the upper part of the rainbow.
D) totally outside the rainbow.
E) nowhere, for there is no shadow.
Answer: A
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A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If m1 is 1.00 kg, 
is 2.00 kg, and M is 4.00 kg, then what is the tension in the string attached to 
?
A. 3.92 
B. 3.65
C. 3.23
D. 3.02
E. 2.98
During batting practice, two baseballs have the same speed when leaving the bat of Babe Ruth. One ball goes over the outfield fence for a home run, and the other can be caught by an infielder. The difference between the two swings is that the home run ball starts out at an angle ________ 45°.
Fill in the blank(s) with the appropriate word(s).
A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
A. 0.50 B B. 1.4 B C. 2.0 B D. 0.71 B E. 1.7 B
A helium nucleus (charge = 2e, mass = 6.63 × 10^-27 kg) traveling at 6.20 × 10^5 m/s enters an electric field, traveling from point A, at a potential of 1.50 × 10^3 V, to point B, at 4.00 × 10^3 V. What is its speed at point B?
1.7.91 × 10^5 m/s 2.3.78 × 10^5 m/s 3.2.13 × 10^5 m/s 4.2.52 × 10^6 m/s 5.3.01 × 10^8 m/s