A good heat conductor is
A) a poor insulator.
B) a good insulator.
C) neither of these
Answer: A
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What is the limiting angle of resolution for the eye if the pupil diameter of the eye is 4.0 mm, the wavelength of the light is 600 nm, and index of refraction of the liquid in the eye is 1.34?
A) 0.42 mrad B) 0.21 mrad C) 0.14 mrad D) 0.11 mrad E) 0.26 mrad
A locomotive is pulling three train cars along a level track with a force of 100,000 N. The car next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg
You can neglect the friction on the cars being pulled. (a) What is the magnitude of the force between that the 80,000-kg car exerts on the 50,000-kg car? (b) What is the magnitude of the force that the 50,000-kg car exerts on the 70,000-kg car?
Which of the following is not a terrestrial planet?
a. Earth b. Mars c. Saturn d. Venus
Evidence to support that the inner core is solid and the outer core is liquid comes from
A) refraction of seismic waves as they encounter different mediums. B) the wave shadow effect of P- and S-waves as they encounter the solid and liquid core. C) the wave shadow effect of P- and S-waves, and the increase in velocity of P-waves as they encounter the solid inner core. D) the inner core is not solid, but is liquid.