The removal of the carbon dioxide from the atmosphere is critical to Earth because:
A) an atmosphere rich in carbon dioxide can trap heat.
B) carbon dioxide is transparent to infrared radiation.
C) carbon dioxide is opaque to ultraviolet radiation.
D) carbon dioxide reduces plants' ability to synthesize energy.
A
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A known weight W is supported at B by two separate cables, AB and BC. Later cable BD with known tensile force TBD 5 W/2 is added to prevent oscillations. The force in cable AB, TAB, is (in terms of weight W):
(A) 20.98W
(B) 0.96W
(C) 20.84W
(D) 20.76W
The heat of fusion of ice is 80. kcal/kg-C°. When 50. g of ice at 0°C is added to 50. g of water at 25°C, what is the final temperature?
What will be an ideal response?
The center of mass and the center of gravity coincide
A) only if the object is symmetrical. B) only if the object is symmetrical and it is in a uniform gravitational field. C) if the object is in a uniform gravitational field. D) at all times.
A school principal tells a new teacher that "the orderly classroom is quiet
" Using this definition of order, and assuming a class of twenty pupils, enumerate possible states of the system (a state specifies each one of the twenty and whether the student is quiet or talking). Why is it so hard to have a classroom completely in order?