An air column, open at one end and closed at the other, is being designed so that its second lowest resonant frequency is 440 Hz. What should be the length of the column if the speed of sound in air is 340 m/s?
A) 0.386 m
B) 0.772 m
C) 1.16 m
D) 0.193 m
E) 0.580 m
E
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A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
When coal dust is spread on snow on a sunny day
A) more melting occurs. B) less melting occurs. C) no change in melting rate occurs.
The temperature coefficient of resistivity of platinum is 3.9 × 10-3/K°. If a platinum wire has a resistance of R at room temperature (23.°C), to what temperature must it be heated in order to double its resistance to 2R?
What will be an ideal response?
Two stars of masses M and 6M are separated by a distance D. Determine the distance (measured from M) to a point at which the net gravitational force on a third mass would be zero
a. 0.41 D b. 0.33 D c. 0.37 D d. 0.29 D e. 0.14 D