The heat of fusion of ice is 80. kcal/kg-C°. When 50. g of ice at 0°C is added to 50. g of water at 25°C, what is the final temperature?
What will be an ideal response?
0°C
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The jovian planets in our solar system are ________
A) Jupiter, Saturn, Uranus, and Neptune B) Mercury, Venus, Earth, and Mars C) Io, Europa, Ganymede, and Callisto D) Pluto and Eris
Buoyancy: A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord? The density of water is 1000 kg/m3.
A. 35 N B. 40 N C. 46 N D. 52 N E. 58 N
A mercury manometer measures a pressure of 150 mmHg. What is this pressure in kPa?
A. 12 B. 15 C. 20 D. 24 E. 29
According to observations, what type of galaxy was much more common when the universe was 2 billion years old?
A) elliptical galaxies B) spiral galaxies C) irregular galaxies D) We can't say, because we are living at a time when the universe is 14 billion years old, not 2 billion years.