What is necessary for convection to occur in a substance?
A) The substance must be subjected to a strong magnetic field.
B) Dense material must be added to the substance.
C) The substance is strongly shaken or disturbed by a strong wind.
D) The substance is strongly cooled from underneath.
E) The substance is strongly heated from underneath.
E) The substance is strongly heated from underneath.
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Which best represents 5,362,000,000 kilometers in scientific notation?
a. 5.4 x 10^9 m b. 5 x 10^10 km c. 53.6 x 10^6 km d. 5.362 x 10^9 mi e. 5.362 x 10^9 km
The resultant force vector R (in newtons) is:
Bracket ADO is acted on by forces F and T and couple M (see figure). Assume that F 5 8 N, T 5 9 N and
M 5 12 N?m. Joint coordinates are in meters.
(A) -5i + 7j + 1k
(B) -3i + 4j - 3k
(C) -6i + 5j + 4k
(D) -3i + 6j + 2k
An ideal transformer has 50 turns in its primary and 250 turns in its secondary. When 12-V ac is connected to the primary, the voltage available to the secondary is
A) 5 V. B) 10 V. C) 30 V. D) 60 V.
Light from a helium-neon laser (? = 632.8 nm) is incident upon a 0.200-mm-wide slit. Find the total width of the central maximum 2.00 m from the slit