Which of the following statements is not true about the sky at Earth's equator?
A) The Sun will pass directly overhead around noon each day.
B) Over the course of the year, all 88 constellations will at some point be visible in the evening sky.
C) There are no circumpolar stars in the equatorial sky.
D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
A) The Sun will pass directly overhead around noon each day.
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The Eiffel tower in Paris is 300 meters tall on a cold day (T = – 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)
An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon
What is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 840 m/s B) 910 m/s C) 980 m/s D) 770 m/s E) 1100 m/s
The expression(s) indicating the atomic number of a nucleus is
a. A b. N c. Z d. Z + N e. A – Z
A binary star system is one with two stars orbiting each other. How can the Doppler effect be used to find binary stars whose orbital plane is along our line of sight? Their periods?
What will be an ideal response?