Astronomical alignments in antiquity on solstice and equinox sunrises and sunsets show us these builders had developed a ________ for farming
Fill in the blank(s) with correct word
calendar
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Chemical analysis of a rock can tell us
A) when the rock formed B) the detailed geological history of the rock C) what the rock is made of D) the temperature and pressure conditions under which it formed
In stellar astronomy, _____ states that the weight of each layer of a star must be supported by the layer below
A) the law of conservation of mass B) the law of conservation of energy C) the law of hydrostatic equilibrium D) the law of energy transport
Why do compasses point north?
a. Because the Coriolis force tends to force to point to the North Pole. b. Because Earth is a magnet with a magnetic north pole near the geographic North Pole. c. Because Earth is a magnet with a magnetic south pole near the geographic North Pole. d. Because the Earth is unmagnetized but its atmosphere is magnetic, especially near the North Pole. e. Because the Coriolis force deflects magnetic field lines to the right.
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s B. 0.10 km/s C. 0.16 km/s D. 0.23 km/s E. 0.06 km/s