Water at 20ºC flows at 5 m/s through a 2 cm diameter tube. If the tube roughness is 2 x 10^-5m, estimate the friction factor defined by Equation 4-19.
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RC Circuits: For the circuit shown in the figure, V = 20 V, C = 10 µF, R = 0.80 M?, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. What is the potential difference across the resistor 20 s after closing the switch? 
A. 1.6 V B. 2.0 V C. 2.3 V D. 2.6 V E. 3.0 V
The greater the mass of the foreground cluster of galaxies, the more warped the images of the distant galaxies are when they undergo gravitational lensing
Indicate whether the statement is true or false
Quasars may result from the very energetic merging of ________ in condensing galaxies
Fill in the blank(s) with correct word
A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Such a device is called
A) an electromagnet. B) an electrosolenoid. C) a permanent magnet. D) a ferromagnet. E) a hysteresis loop.