Frame size is the number of ______ for the width and height of the video display.
A. pixels
B. bits
C. samples
D. inches
Answer: A
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Buoyancy: A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord? The density of water is 1000 kg/m3.
A. 35 N B. 40 N C. 46 N D. 52 N E. 58 N
A Carnot heat engine operates between 400 K and 500 K. Its efficiency is:
A. 20% B. 25% C. 44% D. 79% E. 100%
A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. What is the charge on the capacitor 2.0 s after the switch is closed?
a.
0.43 C
b.
0 66 C
c.
0.86 C
d.
0.99 C
How much water at 20 degrees Celsius is needed to melt 500 grams of ice at 0 degree Celsius?
a. 500 grams b. 1000 grams c. 1500 grams d. 2000 grams