The accelerating force of the wind on a small 300-kg sailboat is 780 N northeast. If the drag of the keel is 552 N acting west, what is the acceleration of the boat?
a. 4.4 m/s2 due east
b. 1.8 m/s2 due north
c. 2.6 m/s2 northeast
d. 3.2 m/s2 north by northwest
e. 0.23 m/s2 due east
b
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The absolute value of the electric potential at a distance of 4 m from a certain point charge is 200 V. What is the absolute value of this potential at a distance of 8 m from the same point charge?
A) 50 V B) 400 V C) 100 V D) 200 V E) 600 V
An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s toward the stationary observer, then what is the frequency of the siren perceived by the observer?
A. 2,579 Hz B. 2,540 Hz C. 2,525 Hz D. 2,500 Hz E. 2,480 Hz
Which of the following statements about black holes is true for an object falling into a black hole?
A) From an outside observer's viewpoint, the object falls quickly through the event horizon. B) From an outside observer's viewpoint, light from the object will become increasingly blueshifted as it approaches the event horizon. C) In the object's reference frame, the object will slow down as it falls and come to a stop just before it reaches the event horizon. D) Once the object crosses the event horizon, it can no longer communicate with anything outside the black hole.
The yield strength of metals is proportional to the negative _________ power of the grain diameter.
Fill in the blank(s) with the appropriate word(s).