Dark matter has not been observed at any electromagnetic wavelength
Indicate whether the statement is true or false
TRUE
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Which physical unit is the SI acceleration of gravity?
A) 40 km, SW B) 32 ft/s2 C) 9.8 m/s2 D) 186,000 mi E) -120 mi/s
Objects which have contracted, but are of too little mass to establish thermonuclear reactions in their cores, are ________, which slowly continue to cool
Fill in the blank(s) with correct word
The Cassini division seen in Saturn's rings is the result of a gravitational interaction from one of its moons on Saturn's rings.
Answer the following statement true (T) or false (F)
A convex-concave thin lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm. If the glass used has index of refraction 1.500, what is the focal length of this lens?
A) -32.0 cm B) 32.0 cm C) 113 cm D) 67.5 cm E) -113 cm