As viewed from any place within the continental United States, noon on apparent solar time is defined as the moment when the Sun is
A) directly overhead.
B) ante meridiem.
C) at a right ascension of 0 hours.
D) directly south.
D
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A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed.
A. 1.6 ?T B. 4.9 ?T C. 1.0 ?T D. 9.8 ?T E. 15 ?T
Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision. Car B has a mass of 1600 kg
The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision, assuming that any other unbalanced forces are negligible? A) 16 m/s B) 18 m/s C) 11 m/s D) 21 m/s E) 14 m/s
The quark and antiquark in a meson are always of the same flavor
Indicate whether the statement is true or false
In a sequence of rock layers we find trilobite fossils at the bottom of rock layer 1 and dinosaur fossils directly above the fossil trilobites in layer 2. There are inclusions of trilobites in layer 2. We conclude that
A) dinosaurs were extinct long before trilobites came into existence. B) dinosaurs are from the Cambrian Period. C) by inclusion and faunal succession, layer 1 is older than layer 2. D) there is no time gap between the rocks.