What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee
B) Full Moon on ecliptic at perihelion
C) New Moon on ecliptic at perigee
D) New Moon on equator at apogee
E) New Moon on ecliptic at apogee
E
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____ has a negative charge and a mass about 2000 times smaller than a proton
a. A neutron b. An electron c. A molecule d. A nucleus e. An isotope
Equilibrium: A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle ? below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to
A. W. B. W + P. C. W + P cos ?. D. W + P sin ?. E. W - P sin ?.
Which of the following has the longest wavelength?
a) Visible light b) Gamma Ray c) Ultraviolet d) Radiowaves
After a supernova explosion, the remains of the stellar core ________
A) will always be a neutron star B) may be either a neutron star or a black hole C) will always be a black hole D) may be either a white dwarf, neutron star, or black hole