Within what percentage of the correct value would you expect an order-of-magnitude calculation to result?
1.100%
2.10%
3.1000%
4.1%
4
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If you stand in front of a concave mirror, exactly at its focal point,
A) you won't see your image because there is none. B) you will see your image, and you will appear smaller. C) you will see your image at your same height. D) you will see your image and you will appear larger. E) you won't see your image because it's focused at a different distance.
A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the kinetic energy of the block that results from the collision if the block had not been moving prior to the collision and was free to move?
a. 10 kJ c. 0.16 kJ b. 9.8 kJ d. 0.13 kJ
A __ is a large geographic area with a climate that supports distinctive plant and animal groups.
Fill in the blank(s) with the appropriate word(s).
When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
1) more than the resistance of either lamp, 2) less than the resistance of either lamp, And when the same two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is 3) more than the resistance of either lamp. 4) less than the resistance of either lamp. 5) none of these