A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward
B) 0.5g downward
C) 2g downward
D) g upward
E) 2g upward
A
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Thermoset polymers _________be melted for processing or recycling.
Fill in the blank(s) with the appropriate word(s).
The Hubble time is
a. the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the universe stops expanding and begins to contract. e. an estimate of the age of the universe based on the Hubble constant.
As a result of the atmosphere surrounding the Earth trapping some of the incoming solar radiation, the average temperature of the Earth is approximately 15°C. Estimate the amount of radiation that is trapped by the atmosphere, including CO2 and methane, which provides the shield to maintain the temperature at a level that sustains living organisms. Comment on the current concern about global warming as a result of an increasing percentage of CO2 and methane in the atmosphere surrounding the Earth.
GIVEN The average temperature of the earth is 150C. FIND • Amount of radiation trapped by atmosphere • Comment on concern about global warming as a result of increasing percentage of CO2
The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum. This principle can also be applied to the simultaneous measurement of two other variables, which are
a. force and color. b. energy and time interval. c. mass and charge. d. torque and frequency.