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
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
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