How did Ptolemy explain the retrograde motion of Venus?
What will be an ideal response?
The epicycle for both Mercury and Venus is always centered on the Earth-Sun line, so they always orbit between us and the Sun.
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A step-up transformer has an input voltage of 110 V (rms). There are 100 turns on the primary and 1500 on the secondary. What is the output voltage?
a. 1600 V (max) b. 1650 V (rms) c. 3260 V (max) d. 165 kV (rms) e. 7.3 V (rms)
The graphs below show angular velocity as a function of time. In which one is the magnitude of the angular acceleration constantly decreasing?
A.
B.
C.
D.
E.
Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?
A) Both do positive work, but person X does four times the work of person Y. B) Both do positive work, but person X does twice the work of person Y. C) Both do the same amount of positive work. D) Both do zero work. E) Both do positive work, but person X does one-half the work of person Y.
Give the formula, including the ionic charge, for each of the following polyatomic ions
a. hydroxide b. sulfate c. ammonium d. phosphate