What is the symbol for a neutrino?
a. n b.
c. d. none of the above
b
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An arrangement of 3 charges is drawn showing the field lines. The first charge has 20 lines going into it. The second charge has 30 lines going out of it. If the net charge of the arrangement is zero, what is the field line situation for the third charge?
A. 50 lines going out B. 50 lines going in C. 10 lines going out D. 10 lines going in E. 600 lines going out to infinity
Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
a. 12 rad/s2 b. 5.9 rad/s2 c. 8.4 rad/s2 d. 5.4 rad/s2 e. 17 rad/s2
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A. 8 × 10?5 W/m2 B. 8 × 10?6 W/m2 C. 3 × 10?3 W/m2 D. 0.8 W/m2 E. 2.5 × 10?5 W/m2
This x-ray image was taken by the Chandra X-ray Observatory. Without knowing anything more about the object that is shown, what can you conclude from looking at this image?
A) Some parts of the object emit more x-rays than others. B) The x-rays from this object come in a variety of different colors. C) This object emits much more light in the form of x-rays than in the form of visible light. D) Yellow regions emit the highest-energy x-rays and red regions emit the lowest-energy x-rays.