The direction of a magnetic field at a point can be determined by __________
Fill in the blank(s) with correct word
a compass
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What two observable properties of a Cepheid variable are directly related to one another?
A) the period between its peaks of brightness and its luminosity B) the period between its peaks of brightness and its distance C) its luminosity and its mass D) its mass and its distance
Three charged particles are arranged on corners of a square as shown in Figure OQ23.11, with charge -Q on both the particle at the upper left corner and the particle at the lower right corner and with charge +2Q on the particle at the lower left corner. Suppose the +2Q charge at the lower left corner is removed. Then the magnitude of the field at the upper right corner:
1.becomes larger.
2.becomes smaller.
3.stays the same.
4.changes unpredictably.
Although it has no liquid water, Mercury has a tidal bulge
Indicate whether the statement is true or false
Rapid evaporation of hot water can lead to
A) superheated steam. B) the formation of ice. C) both of these D) neither of these