A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force.
b. It is due to the ether.
c. It is a gravitational force.
d. It is something other than any of the above.
A
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A 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s2. On top of the 5.0-kg mass is an object of unknown mass. The force of the elevator on the 5.0-kg mass is 80 N up. Determine the unknown mass.
A. 3.3 kg B. 2.4 kg C. 1.6 kg D. 4.1 kg E. 5.0 kg
The appearance of a mineral's surface in reflected light is called its ______________
Fill in the blank(s) with correct word
Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same period?
A. I and III, and also II and IV B. I and IV, and also II and III C. I and II, and also III and IV D. All of them have the same period. E. They all have different periods.
If you were to unscrew bulb B from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb A would
A. get brighter. B. become dimmer. C. remain at the same brightness. D. go out.