The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation is 6.0 cm when adjusted for minimum eyestrain for a person with a near point of 25.0 cm
If the microscope is focused on a small object, the magnitude of its final overall magnification is closest to
A) 200. B) 150. C) 50. D) 100. E) 250.
D
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A box is launched up a frictionless incline with an angle of elevation ?. The maximum height reached by the box is h. The box is again launched up the incline with the same initial speed it had before, but this time the angle of elevation has been increased to ?. How does the maximum height H reached this time by the box compare with the previous value h?
a. H = h b. H > h c. H < h d. H = ((sin?)/(sin?))
What did Carl Sagan mean when he said that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that the Earth formed at the same time as the Sun C) that the carbon, oxygen, and other elements essential to life were created by fusion in stellar cores D) that the Sun formed from the interstellar medium: the "stuff" between the stars E) that the universe contains billions of stars
The gibbous Moon is never visible in the daytime sky
a. True b. False Indicate whether the statement is true or false
To help keep buildings cool in the summer, dark colored window shades have been replaced by light colored shades. This is because light colored shades:
A. are more pleasing to the eye B. absorb more sunlight C. reflect more sunlight D. transmit more sunlight E. have a lower thermal conductivity