Estimate the number of pennies that would fit in a box one foot long by one foot wide by one foot tall
A) 5 × 102
B) 5 × 103
C) 5 × 104
D) 5 × 105
E) 5 x 106
C
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Two solenoids, A and B, are wound using equal lengths of the same kind of wire. The length of the axis of each solenoid is large compared with its diameter. The axial length of A is twice as large as that of B, and A has twice as many turns as B. What is the ratio of the inductance of solenoid A to that of solenoid B?
1.4 2.2 3.1 4.1/2 5.1/4
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south
If our year were twice as long (that is, if Earth took twice as many days to complete each orbit around the Sun), but Earth's rotation period and axis tilt were unchanged, then
A) stars would take twice as long to rise and set. B) the cycle of precession would take 13,000 years instead of 26,000 years. C) the four seasons would each be twice as long as they are now. D) the Earth would not have seasons.
According to the law of Malus, the transmitted intensity of a polarized beam of light passing through a polarizer is unchanged for an angle of 90°
Indicate whether the statement is true or false