The Paleozoic era ended and the Mesozoic era began about ______________ million years ago
Fill in the blank(s) with correct word
245
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The minimum amount of energy necessary to eject an electron from a metal surface is referred as Planck's constant
Indicate whether the statement is true or false
An inventor wants you to finance construction of a machine that will do work by running a continuous chain through a pulley, letting weights attached every so often fall down do the work
The machine should run forever, because the weights will fall again and again as the chain goes round the pulley. You both can sell energy so cheaply, you'd make millions. Should you invest $100,000? Why or why not?
Where would you be if the Sun sets for six continuous months, beginning about September 23rd?
A) North Pole B) Arctic Circle C) Equator D) Antarctic Circle E) South Pole
It is necessary to determine the specific heat of an unknown object. The mass of the object is measured to be 199.0 g
It is determined experimentally that it takes 16.0 J to raise the temperature 10.0°C. Find the specific heat of the object. A) 8.04 J/kg ? K B) 1600 J/kg ? K C) 0.00120 J/kg ? K D) 3.18 × 106 J/kg ? K