Which statement about the Local Group is false?
A) Most of its members are dwarf elliptical and irregular galaxies.
B) It contains about 55 member galaxies.
C) Its notable spirals include the Milky Way, M31, and M33.
D) It contains the large radio galaxy Centaurus A.
E) It is about three million light-years across.
D
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How is the magnification, mo, of the objective lens in a microscope related to the focal length, fo, of the lens?
A. Amo= -1/fo B. mo= -fo/L C. mo= -L/fo D. mo= L - fo
A system of blocks and a frictionless pulley is shown in the figure. Block A has a mass of 2.0 kg and is on a rough horizontal surface for which ?s = 0.40 between the surface and block A
The rope pulls horizontally on block A. Block C has a mass of 1.0 kg. An external force P = 23.0 N, applied vertically to block A, maintains the system at rest as shown in the figure. What is the friction force on block A? A) 6.3 N B) 6.9 N C) 7.5 N D) 5.7 N E) 5.1 N
Which of these lamps is the longer lasting in a common circuit?
A) incandescent lamp B) compact fluorescent lamp C) light-emitting diode D) all about the same
When a nucleus undergoes alpha decay, the daughter element always has
A. more electrons than the parent. B. less charge than the parent. C. more neutrons than the parent. D. the same atomic number as the parent.