An important reason for using a very large diameter objective in an astronomical telescope in space is
A) to increase the magnification.
B) to increase the resolution.
C) to increase the width of the field of view.
D) to form a virtual image, which is easier to look at.
E) to increase the depth of the field of view.
B
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A toaster, sketched in the figure, has two heating elements on either side of a slice of bread when toasting the bread. The element temperature is 450ºC and its emissivity is 0.85 when bread is toasted. If the bread is at 100ºC, the bread’s emissivity is 0.65, and the surroundings reradiate heat, determine the net heat transfer to the bread.
What will be an ideal response?
Which of the following is true of life on Earth?
A) Life, in the form of multicellular organisms, has existed on Earth for only about 2 million years. B) Life has existed on Earth for at least 3.4 billion years. C) The Cambrian explosion marks the formation of the first unicellular organisms on Earth. D) Complex multicellular organisms were present on Earth 2.5 billion years ago.
The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the gases plotted in the diagram could be retained in the atmosphere of Mars?
Most stars on the main sequence fuse hydrogen into helium in their cores, but some do not
Indicate whether the statement is true or false