You are building a compound microscope with an objective lens of focal length 1.1 cm and an eyepiece lens of focal length 5.0 cm. You mount the lenses 18 cm apart. What is the approximate magnification of your microscope?
a. 3
c. 80
b. 7
d. 130
C
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A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
A. 41 mT B. 33 mT C. 55 mT D. 87 mT E. 57 mT
What happens when a core's density exceeds that which electron degeneracy pressure can support?
a. The core collapses to a black hole. b. The core collapses to a neutron star. c. The core collapses to a white dwarf. d. The core collapses to a neutron star or a black hole.
The absolute temperature of an ideal gas is directly proportional to which of the following properties, when taken as an average, of the molecules of that gas?
a. speed b. momentum c. mass d. kinetic energy
A volume of gas is decreased by half while the temperature remains constant. How much does the gas pressure change?