Which of the following signals from an advanced civilization would be easiest to detect?
A) high intensity, narrow bandwidth
B) low intensity, wide bandwidth
C) high intensity, wide bandwidth
D) low intensity, narrow bandwidth
A
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A 6.0-?F air-filled capacitor is connected across a 100-V voltage source
After the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). How much ADDITIONAL charge flows from the voltage source, which remained connected during the process? A) 1.5 mC B) 2.1 mC C) 1.7 mC D) 2.5 mC E) 1.2 mC
Water that soaks into the soil and collects in the subsurface is called ______________
Fill in the blank(s) with correct word
Dark matter was initially proposed to explain
A) the velocities of stars and gases in spiral galaxy arms. B) stellar nebulae. C) black holes. D) the expansion of the universe.
A heavy box is located in the center of the cargo hold of a train. There are no other boxes or items in the cargo hold and there are no straps holding the box down. The train accelerates along the track in the northward direction. The direction of the friction force exerted by the floor of the cargo hold on the box is
1.upward. 2.none; no friction force exists because the box is not sliding. 3.to the north. 4.to the south.