If an electric drill has a case ground, this means
1.its case has been ground to a shiny surface.
2.the drill uses a two-prong plug.
3.the "hot" wire and the second wire are both attached to ground.
4.the case of the drill is grounded separately using a third wire.
4
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A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22.°C. Which gas molecules have the greater average speed?
A) The oxygen molecules do because they are diatomic. B) The helium molecules do because they are monatomic. C) The oxygen molecules do because they are more massive. D) It is the same for both because the temperatures are the same. E) The helium molecules do because they are less massive.
In a certain material there is a current of 16 A flowing through a surface to the left, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface?
a. 16 C/s toward the left c. 8 C/s toward the right b. 16 C/s toward the right d. 8 C/s toward the left
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c b. 0.21 c c. -0.21 c d. 0.93 c e. -0.93 c
Where would you be if the Sun passes through your zenith on December 21st?
A) Equator B) Tropic of Cancer C) Tropic of Capricorn D) Antarctic Circle E) South Pole