The distance between the object to be viewed 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. What is the magnitude of the total magnification of the microscope when used by the person of normal eyesight if it is designed for minimum eyestrain?
A) 1070
B) 204
C) 520
D) 477
E) 772
A
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Jupiter does not have
a. a hot interior. b. convection occurring in its atmosphere. c. crustal plates on its surface. d. a dynamo effect. e. any rings.
Which chemical elements were created during the first few minutes of the "big bang" that started our universe?
A) All 92 of the naturally-occurring chemical elements. B) Only the elements through iron in the periodic table, i.e., only elements 1 through 26. C) Only the first three elements: hydrogen, helium, and lithium. D) Only the heaviest elements, having atomic numbers higher than that of lead. E) No elements were produced during the big bang--all the normal chemical elements were produced much later.
Astronomer Alan says the universe is expanding at one rate and Astronomer Wendy says it is expanding at a faster rate. All other things being equal, which astronomer would say that the universe is older?
A) Wendy B) Alan C) neither
In a chiller unit, ammonia is to be condensed at a saturation temperature of 50ºC by passing the ammonia vapor over vertical plates 100 cm high by 150 cm wide and at a surface temperature of 20ºC. Estimate the average convective heat transfer coefficient and the amount of ammonia condensing from one plate surface. Use a value of 1052.8 kJ/kg for hnfg for ammonia.
What will be an ideal response?