Ypsilanti, Michigan, is located at latitude 42 degrees North. What is the altitude (above the southern horizon) of the Sun at solar noon on the summer solstice?
A. 132 degrees
B. 108.5 degrees
C. 71.5 degrees
D. 42 degrees
E. 23.5 degrees
Answer: C
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A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 91 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)
a. 84 m/s c. 42 m/s b. 38 m/s d. 19 m/s
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the earth are directed
A. upward. B. downward. C. from south to north. D. from north to south. E. from east to west.
Why can't the elements of a compound be separated from one another by physical means?
A) They are too homogeneous when found within a compound. B) Their atoms are too tightly bound to one another. C) Elements found within a compound tend to be inert. D) Elements tend not to be soluble in water.
A nonrelativistic electron and a nonrelativistic proton are moving and have the same de Broglie wavelength. Which of the following are also the same for the two particles?
1.speed 2.kinetic energy 3.momentum 4.frequency