Cepheids are good examples of cataclysmic variable stars
Indicate whether the statement is true or false
FALSE
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Conduction: A glass tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? Neglect the heat capacity of the kettle, and assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of glass is 0.840 W/m ? K and the specific heat of water is 4186 J/kg ? K.
A. 39°C B. 92°C C. 120°C D. 86°C E. 77°C
In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
A) it is so far away that we will probably have stopped communicating before we receive and return signal B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life C) the message will be absorbed by interstellar dust before it reaches the cluster D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life
The motion of a falling object is commonly investigated with the aid of a
A. stethoscope. B. stroboscope. C. kaleidoscope. D. microscope.
In Heisenberg's formula, ?p ?x? h, the h symbolizes
A) Planck's constant. B) an average value of Planck's constant. C) the peak value of Planck's constant. D) Planck's constant divided by 2?. E) none of the above