A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = ?30 cm. What is the acceleration of the particle?
A. ?7.3 cm/s2
B. ?8.9 cm/s2
C. ?11 cm/s2
D. ?15 cm/s2
E. ?13 cm/s2
Answer: A
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Heat Engines: A heat engine performs the reversible cycle abca with 9.0 moles of an ideal gas, as shown in the pV diagram in the figure. Path ca is an adiabatic process for which the adiabatic constant of the gas is 1.60. The temperature at point a is 300 K and at point b it is 500 K, and the volume at point c is 0.20 m3. (R = 8.31 J/mol ? K)(a) How much heat is absorbed by the gas in segment ab?(b) How much heat is absorbed by the gas in segment ca?
Fill in the blank(s) with the appropriate word(s).
At a certain time, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A) 280 B) 28 C) 2800 D) 2.8 E) 0.28
An example of a diatomic molecule of an element is
a. He b. N2 c. P4 d. CO
Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?
a. partial reflection, total transmission b. total transmission c. total reflection d. partial reflection, partial transmission