A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed form the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^-6 (°C)-1.)
a. 0.079 3 cm2
b. 0.159 cm2
c. 0.238 cm2
d. 0.841 cm2
e. 0.921 cm2
D
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Matter falling into a black hole arranges itself in the shape of a ____
a. spherical shell that is thick at the edges and thin closer to the center b. spherical shell that is thin at the edges and thick closer to the center c. disk that is thick at the outer edge, thin along the inner ring d. disk that is thin at the outer edge and thick closer to the center e. disk that is thin from the outer edge to the center
According to our theory of solar system formation, why do we find some exceptions to the general rules and patterns of the planets?
A) Our theory is not quite correct because it cannot explain these exceptions. B) Most of the exceptions are the result of giant impacts. C) The exceptions probably represent objects that formed recently, rather than early in the history of the solar system. D) The exceptions probably represent objects that were captured by our solar system from interstellar space. E) The exceptions exist because, even though our theory is as correct as possible, nature never follows rules precisely.
An arrow is shot straight up. At the top of its path, the net force acting on it is
A) instantaneously equal to zero. B) greater than zero, but less than its weight. C) greater than its weight. D) equal to its weight. E) horizontal.
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80
g, what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?