A 3.6 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T
A force diagram, showing the four forces that act on the box in equilibrium, is shown in Figure 5.6. The force F is adjusted so that the magnitude of force T is equal to the weight w. The magnitude of force F, for which this occurs, is closest to: A) 26 N
B) 27 N
C) 28 N
D) 29 N
E) 30 N
A
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Water flows in the horizontal pipe shown in Fig. 13-6. At A the diameter is 5.00 cm and at B the diameter is 4.00 cm
The fluid in the manometer is mercury, which has a density of 13,600 kg/m3. The manometer reading h is 4.40 cm. What volume of water is flowing through the pipe per second? A) 0.0206 m3/s B) 0.0426 m3/s C) 0.00560 m3/s D) 0.372 m3/s E) 0.186 m3/s
Choose all the items that derive from radioactivity
A. helium for children's balloons B. volcanic lava C. warmth in deep mines D. most cancer in the United States
A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
A transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A) 0.75 A B) 1.3 A C) 12 A D) 24 A E) 48 A