A 1000-kg barge is being towed by means of two horizontal cables. One cable is exerting a force of 80.0 N in a direction 30.0° west of north
In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge. A) 19.5° east of north
B) 21.1° east of north
C) 39.0° east of north
D) 47.5° east of north
E) 54.7° east of north
A
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The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
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A. 1.8 m/s2 B. 2.6 m/s2 C. 1.4 m/s2 D. 2.2 m/s2 E. 3.7 m/s2
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Living matter has 1.3 × 10-10 % of its carbon in the form of 14C which has a half-life of 5730 y. A mammoth bone has a 300-g sample of carbon separated from it, and the sample is found to have an activity of 20 decays per second
How old is the bone? A) 15,000 y B) 7600 y C) 11,500 y D) 6400 y E) 10,900 y
A 2.00-m long organ pipe is open at one end and closed at the other. Its fundamental tone has wavelength:
a. 8.00 m. c. 2.00 m. b. 4.00 m. d. 1.00 m.