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?
33 grams
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Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers
Fill in the blank(s) with correct word
Requires 6.0 J of work is needed to push a 2.0-kg object from point A to point B of the frictionless ramp as shown in the figure. What is the length s of the ramp from A to B?
What will be an ideal response?
A cloud fragment too small to collapse into a main sequence star becomes a:
A) white dwarf. B) pulsar. C) T Tauri object. D) brown dwarf. E) planet of another star.
A person's hyperopic (farsighted) eye can focus on objects that are 75 cm away and farther. What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?
What will be an ideal response?