Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A) 11
B) 17
C) 18
D) 19
E) 36
C
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A 5 cm diameter exhaust pipe at 700 K has an opaque outer surface and emissivity of 0.9. A galvanized gray sheet iron tube of 15 cm diameter is placed concentrically around the pipe. If the tube is to have a temperature of no more than 350 K, determine the maximum heat transfer that can be dissipated per unit length of the pipes.
What will be an ideal response?
Standing Waves on a String: A string of linear density 1.5 g/m is under a tension of 20 N. What should be its length if its fundamental resonance frequency is 220 Hz?
A. 0.26 m B. 0.96 m C. 1.1 m D. 1.2 m
At a distance of 14,000 km from the center of Planet Z-99, the free-fall acceleration is 32 m/s2. What is the free-fall acceleration at a point 28,000 km from the center of this planet?
A) 8.0 m/s2 B) 16 m/s2 C) 128 m/s2 D) 4.0 m/s2 E) 2.0 m/s2
What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
a. The fact that heat naturally moves from cooler regions to hotter ones. b. The addition of mechanical work to the system. c. The chance occurrences of heat flow from cooler to hotter systems. d. The use of electricity, not heat. e. The fact that no energy is wasted as heat in this kind of system.