How much water at 20°C is needed to melt 1 kilogram of solid mercury at its melting point of ?39°C? (The heat of fusion of mercury is 2.8 cal/gram)
23.4 grams
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The upward pressure on the bottom surface of a submerged object is less than the downward pressure on its top surface
Indicate whether the statement is true or false
Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
a. 41 J b. 16 J c. 64 J d. 10 J e. 80 J
Radio maps of the spiral arms of our galaxy Group of
a.They map the location of dense neutral hydrogen clouds b.They map the location of hot O and B stars by the radio radiation they emit c.They reveal that the Sun is currently located in the centre of a spiral arm d.They reveal that our galaxy is a grand design spiral
The upward force exerted by a fluid on an object immersed in it is called
a. gravitational force b. atmospheric force c. buoyant force d. weight e. none of the above