A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ball? (?Fe = 7.87 g/cm3, ?water = 1.00 g/cm3 )
A) 6.6 cm
B) 37 cm
C) 131 cm
D) 79 cm
A
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At the lowest point in a vertical dive (radius = 0.58 km), an airplane has a speed of 300 km/h which is not changing. Determine the magnitude of the acceleration of the pilot at this lowest point
a. 26 m/s2 b. 21 m/s2 c. 16 m/s2 d. 12 m/s2 e. 8.8 m/s2
Series/Parallel Circuits: If emf of the ideal battery is V = 100 V, what is the potential difference across R5 for the circuit shown in the figure?
A. 19 V B. 40 V C. 75 V D. 77 V
For a high-temperature gas turbine application, you have chosen to use alumina ceramic material for a non-rotating part that is subject to modest forces. You find that you can save a significant amount of money by buying alumina that is of 1% lower density than more-expensive alumina, and in aircraft design saving weight is always desired. What aspect of the defect structure of the cheaper alumina should you investigate to determine its possible effects on mechanical properties, and why may this be important?
What will be an ideal response?
A packet, or quantum of light or any other type of electromagnetic radiation is called
a) an energy level. b) a photon. c) an excited state. d) a discrete bundle.