The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm. A person with a near point of 25
0 cm and a far point at infinity is using the microscope. (a) What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b) What is the total magnification of the microscope when used by the person of normal eyesight?
(a) 9.62 x (b) -1070 x
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A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3 m/s2. (a) Determine the mass of the block
(b) Calculate the distance the block will travel is the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring stellar radii with very powerful telescopes B) by measuring the masses and spectral types of main-sequence stars in binary systems C) by using computer models of hydrogen fusion and stellar structure D) by comparing stars with the same spectral type but different luminosities
Energy in Nuclear Reactions: Two deuterium nuclei, 
H, fuse to produce a tritium nucleus, 
H, plus an ordinary hydrogen nucleus, 
H. A neutral deuterium atom has a mass of 2.014102 u; a neutral tritium atom has a mass of 3.016050 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. How much energy is released in this fusion process? (1 u = 931.5 MeV/c2)
A. 3.03 MeV B. 3.53 MeV C. 4.03 MeV D. 4.53 MeV E. 6.58 MeV
Approximately what is the half-life of uranium-235?
a. 0.5 billion years b. 1.25 billion years c. 700 million years d. 2.8 billion years