A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in Figure OQ31.10. An external magnetic field is directed perpendicular to the plane of the circuit. Which of the following actions will make the bulb light up? More than one statement may be correct
1,2,3,4
Physics & Space Science
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The intensity of a sunspot is found to be 3 times smaller than the intensity emitted by the solar surface. What is the approximate temperature of this sunspot if the temperature of the solar surface is 5800 K?
a. 4400 K b. 470,000 K c. 1900 K d. 7600 K e. 1400 K
Physics & Space Science
When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Jeff throws a ball straight up. For which situation is the vertical velocity zero?
a. on the way up b. at the top c. on the way back down d. none of the above
Physics & Space Science
The frictional force is a conservative force
Indicate whether the statement is true or false
Physics & Space Science