A bronze rod 1 cm in diameter and 30 cm long protrudes from a bronze surface at 150ºC. The rod us surrounded by air at 10ºC with a convective heat transfer coefficient of 10 W/m^2K. Determine the heat transfer through the rod.
What will be an ideal response?
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Coulomb's Law: Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.6 N B. 1.8 N C. 2.0 N D. 2.2 N E. 2.4 N
When you send a wave pulse down a rope or Slinky, it eventually dies out. What has become of the energy?
A) It was transformed into electromagnetic energy. B) It was transformed into Italian sausage. C) It was transformed into thermal energy. D) It was transformed into elastic energy. E) It vanished because energy is always lost in all physical processes.
A bird, accelerating from rest at a constant rate, experiences a displacement of 25 m in 15 s. What is the final velocity after 15 s?
a. 2.5 m/s b. 1.7 m/s c. 3.3 m/s d. 3.8 m/s e. zero
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 is 40 psi. a. True b. False