A magnetic compass points towards the north geographic pole of the Earth because
A. there is a south magnetic pole near the north geographic pole.
B. there is a north magnetic pole near the north geographic pole.
C. all magnetic poles, north or south, point that way due to the spin of the Earth.
D. the static electricity in the atmosphere causes the alignment of the compass.
Answer: A
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An alloy of 80 atomic % arsenic and 20 atomic % gallium is produced, and the alloy is heated to 1250°C to thoroughly melt the mixture. The alloy is then slowly cooled so that it is always close to equilibrium. Answer the following about the alloy:
(a) At what temperature does a solid first form?
(b) What is the chemical composition of the first solid to form?
(c) Below what temperature is the alloy completely solid?
(d) At room temperature (23°C), what phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
A steel plane truss is loaded at B and C by forces P 5 200 kN. The cross-sectional area of each member is A 5 3970 mm2. Truss dimen-sions are H 5 3 m and L 5 4 m. The maximum shear stress in bar AB is approximately:
(A) 27 MPa
(B) 33 MPa
(C) 50 MPa
(D) 69 MPa
An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
a. 100 W b. 150 W c. 500 W d. 1000 W e. 2000 W
The apparent path that the Sun traces annually along the celestial sphere is known as the ______________
Fill in the blank(s) with correct word