The accelerating force of the wind on a small 250-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat?
a. 1.5 m/s2 due east
c. 3.0 m/s2 northeast
b. 2.5 m/s2 due north
d. 2.0 m/s2 due north
D
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Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency sound waves.
Tritium (3H) has a half-life of 12.3 years and releases 0.018 6 MeV energy per decay. What is the rate at which energy is released for a 1.5-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.016 05 u)
a. 1.6 W b. 2.3 W c. 9.9E+12 W d. 5.0E+7 W e. 85.4 W
When a 24.0-W resistor is connected across a 12.0-V battery, a current of 410 mA flows. What is the internal resistance of the battery?
a. 29.3 W c. 5.3 W b. 0.9 W d. 0.02 W
Which is not a type of gravitationally bound stellar binary?
A: visual binary B: eclipsing binary C: spectroscopic binary D: apparent binary E: astrometric binary