If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
a. 24.5 N
b. 49.0 N
c. 69.3 N
d. 98.0 N
e. 139 N
B
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Answer the following statement(s) true (T) or false (F)
Alain Aspect’s experiments support the quantum prediction that superluminal connections do exist between measuring devices, connections which in fact violate the special theory of relativity.
Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other
The upper sheet carries +5.00 µC/m2. The electric field midway between the sheets is 4.25 × 105 N/C pointing downward. What is the surface charge density on the lower sheet? (?0 = 8.85 × 10-12 C2/N ? m2) What will be an ideal response?
How is Titan, the moon of Saturn, similar to the Earth?
A) like the Earth, Titan has an atmosphere made mostly of molecular nitrogen B) Titan, like the Earth, has an internal magnetic field C) like the Earth, Titan has oceans of liquid water on its surface D) Titan is almost the same size as the Earth
If the growth rate of the number of solar collectors is 7% per year, then 1000 units in use in 2010 will grow to _______ units by the year 2040
a. 1200 b. 2000 c. 4000 d. 8000 e. 20,000