Energy and Momentum: Two objects of different mass have equal, non-zero kinetic energies. Which object has the greater magnitude momentum?
A. the heavier object
B. the lighter object
C. They both have the same magnitude momentum.
Answer: A
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Based on our current knowledge of the motions of Uranus and Neptune, it is obvious that Pluto's discovery was a triumph of physics, on par with Adams and Leverrier's work in finding Neptune
Indicate whether the statement is true or false
Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
a. conservation of angular momentum b. conservation of linear momentum c. conservation of energy d. the law of universal gravitation e. conservation of mass
A microprocessor chip (10 mm *10 mm square) is to be cooled by an impinging circular air jet that is directed on the chip surface by a 5-mm diameter nozzle, placed at a distance of 10 mm. The electrical activity in the microcircuits of the chip render a uniform surface heat flux condition. For safe operation of the microprocessor, the chip- surface temperature should not exceed 90°C. If air at 20°C flows through the nozzle with a velocity of 10 m/s, and the maximum heat dissipated by the chip is 1.25 W, is this jet- impingement cooling system able to maintain the entire chip surface at a safe operating temperature?
GIVEN
FIND
Whether the jet impinging cooling system be able to maintain the entire chip surface to safe operating
temperature.
Which sugar is the sweetest of all sugars?
a. Sucrose b. Lactose c. Glucose d. Fructose