In grinding a steel knife, 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 to remain liquid and not rise above 100°C when the hot blade is quenched in it? The specific heat of the steel is 0.11 cal/g ? C° and the specific heat of water is 1.0 cal/g ? C°. A) 22 g
B) 33 g
C) 44 g
D) 55 g
B
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If the relative magnetic permeability of a material is equal to 0.99999, this material is
(a) Diamagnetic. (b) Paramagnetic. (c) Ferromagnetic. (d) Antiferromagnetic.
There is a permanent dark side of the Moon.
Answer the following statement true (T) or false (F)
Perhaps the MOST convincing piece of evidence suggesting that Europa has a subsurface ocean is the
A) fact that the magnetic field of Jupiter is able to induce a magnetic field in Europa consistent with a salty ocean beneath its crust B) fact that calculations suggest that there is enough internal heat to keep the ice melted beneath the crust C) lack of impact craters on its surface D) observation of iceberg-like features on its surface
According to Einstein's theory of special relativity
A) space and time are aspects of each other. B) energy and mass are aspects of each other. C) both of these D) neither of these