What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2
b. 1.1 m/s2
c. 3.3 m/s2
d. 2.5 m/s2
e. 6.5 m/s2
b
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Series/Parallel Circuits: A 4.0-? resistor is connected to a 12-? resistor and this combination is connected to an ideal dc power supply with voltage V as shown in the figure. If the total current in this circuit is I = 2.0 A, what is the value of voltage V?
A. 2.0 V B. 3.0 V C. 6.0 V D. 1.5 V E. 8.0 V
The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 100 V B) 30 V C) 70 V D) 480 V E) 400 V
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
To see a solar eclipse, you have to be in Earth's shadow
a. True b. False Indicate whether the statement is true or false