Seyfert galaxies are always ____ galaxies
a. dwarf
b. irregular
c. spiral
d. elliptical
e. flocculent
c
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In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have
A) rings. B) moons. C) a solid surface. D) a known size and distance from Earth. E) planets further from the Sun than itself.
The position of a particle as it moves along the x axis is given for t> 0 by x = (t3? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
A. 3 m B. 4 m C. 8 m D. 2 m E. 7 m
Referring to how many kilograms of ice can a 3-ton refrigeration unit produce in a 24-hour period? The heat of fusion of water is 330 kJ/kg.
GIVEN - A three-ton refrigeration unit - Heat of fusion of ice is 330 kJ/kg FIND (a) Kilograms of ice produced by the unit per 24 hour period (b) The refrigeration unit capacity is the net value, i.e., it includes heat losses ASSUMPTIONS (a) Water is cooled to just above the freezing point before entering the unit
Because of refraction, the Sun near sunset appears
A) higher in the sky. B) lower in the sky. C) farther away.