The age of a star cluster can be determined by the luminosity of the main sequence turnoff into the giant stage
Indicate whether the statement is true or false
TRUE
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Light-gathering power is proportional to the _______________ of the telescope primary lens or mirror
Fill in the blank(s) with correct word
The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much thermal energy must be added to 500 g of aluminum originally at 27°C to completely melt it?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
There would be only one ocean tide per 24-hour day if the
A) Earth and Moon were equally massive. B) Moon were more massive than Earth. C) Sun's influence on the tides were negligible. D) Moon's mass were small — only a few kilograms. E) none of the above
An object weighs 300 N. If the gravitational constant G were half of what it is currently, what would the weight of the object be?
a. 300 N b. 150 N c. 75 N d. 600 N e. 450 N