A voltage V is applied to the primary coil of a step-up transformer with a 3:1 ratio of turns between its primary and secondary coils. A resistor R connected to the secondary dissipates a power P = 100 W
How much power is dissipated by the same resistor when the ratio of turns in the transformer is changed to 24:1 and the same input voltage is used?
A) 12,000 W
B) 2400 W
C) 24,000 W
D) 6400 W
E) 100 W
D
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Why does atmospheric pressure decrease as you go higher in altitude on Earth?
A) Gravity gets much weaker with altitude. B) The weight of the atmosphere above you decreases with altitude. C) Temperature decreases with altitude and lower temperature tends to mean lower pressure. D) There are fewer greenhouse gases at higher altitude.
The vast majority of galaxies in the universe are ________ and ________
Fill in the blank(s) with correct word
Two examples of a transverse wave are __________ and __________
Fill in the blank(s) with correct word
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 speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south