Compound Microscope: Which one of the following is a characteristic of a compound microscope?
A. The objective is a diverging lens.
B. The eyepiece is a diverging lens.
C. The final image is real.
D. The image formed by the objective is virtual.
E. The image formed by the objective is real.
Answer: E
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Resistance and Resistivity: Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A. The resistance of wire #1 is twice as high as that of wire #2. B. The resistance of wire #1 is equal to that of wire #2. C. The resistance of wire #1 is half that of wire #2. D. The resistance of wire #1 is four times higher than that of wire #2.
Aster satellite images of Escondida mining region, Chile.
a) How could geologists use these images, at this scale of observation, to find new sources of copper ore?
What happens to the surface temperature and luminosity when a protostar radiatively contracts?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
An object of mass m is moving on a horizontal rough surface. At a certain point it has a speed v m/s and it comes to a stop after traveling 32 m
If the coefficient of friction between the object and the surface is 0.40, what is the value of speed v? Use g = 10 m/s2. A) 16 m/s B) 26 m/s C) 32 m/s D) 38 m/s E) 10 m/s