A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?
2.2 m/s2 at 74° N of W
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A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
a. 5.7 b. 4.6 c. 6.5 d. 7.2 e. 3.6
A semiconductor with an electrical conductivity of 300 (?·m)-1 at room temperature is produced by doping Group IV silicon with Group V antimony. Assume that the mobility of electrons in silicon is equal to 0.10 m2 /V·s and that the mobility of holes is equal to 0.001 m2 /V·s. You can assume that this semiconductor is in the extrinsic range of operation at this temperature.
(a) What type of semiconductor is this? (b) What doping concentration of antimony in atoms/m3 is necessary for this electrical conductivity? (c) State clearly any assumptions you make in this calculation.
Series/Parallel Circuits: If emf of the ideal battery is V = 4.0 V, what is the current through R6 for the circuit shown in the figure?
A. 0.0077 A B. 0.017 A C. 0.040 A D. 4.0 A
How long a tuning fork vibrates when its handle is held against a table is most related to
A) its frequency. B) resonance. C) the conservation of energy. D) the length of its prongs.