If the terrestrial planets were formed by homogeneous accretion, then
a. they were initially molten forming an iron core first, then they accreted a silicate crust later.
b. they were initially molten forming a silicate core first, then they accreted an iron crust later.
c. they were initially collections of solid particles which melted then differentiated into a high-density iron metal core and low-density silicate crust.
d. they were initially collections of solid particles which melted then differentiated into a high-density silicate core and low-density iron metal crust.
c
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A 400-g stainless steel tea kettle containing 500 g of water is on top of 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 2.0 mm thick
At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3C° per minute. What is the difference in temperature between the inside and the outside of the bottom of the tea kettle? The thermal conductivity of stainless steel is 16.3 W/(m•K) and the specific heat is 448 J/(kg•K). A) 2.2°C B) 1.5°C C) 1.1°C D) 0.50°C E) 0.015°C
The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is
A) relatively low for such a tall building. B) stabilized by its structure. C) displaced from its center. D) above a place of support. E) in the same place as its center of mass.
The first planets around other Sun-like stars were discovered
A) by Huygens, following his realization that other stars are Suns. B) by Galileo following the invention of the telescope. C) at the turn of last century. D) about a decade ago. E) at the turn of this century.
The Doppler shift applies only to the line spectrum. It does not apply to the continuous (blackbody) spectrum.
Answer the following statement true (T) or false (F)