Each of two parallel wires separated by 8.0 mm carries a 20-A current. These two currents are oppositely directed. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.0 mT
b. 1.6 mT
c. 1.3 mT
d. 1.8 mT
e. 1.0 mT
C
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You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside
You wish to determine if the ship is stopped or moving at constant velocity. How can you do this? A) You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving. B) You should give up because you have taken on an impossible task! C) You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving. D) You can determine if the ship is moving by determining the apparent velocity of light in the spaceship.
In order to train for a high-g environment, an astronaut is placed in a centrifuge of radius several meters and rotated in a horizontal circle at constant speed. In this situation, in which direction is the net force on the astronaut?
a. The net force is down since gravity cannot be turned off. b. The net force is horizontal toward the center of the circle. c. The net force is between horizontal toward the center of the circle and straight up, the angle depending on the speed and the radius involved. d. The net force is zero since the astronaut is moving at constant speed and thus the force has no direction.
If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
Electrons in the presence of a magnetic field transition from 4p energy states to 3d states. How many different spectral lines could be observed from these transitions?
A) one B) two C) three D) five