You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is
A) zero.
B) 6 J.
C) 16 J.
D) 10 J.
E) impossible to tell without more information.
C
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Charge of uniform surface density (4.0 nC/m2) is distributed on a spherical surface (radius = 2.0 cm). What is the total electric flux through a concentric spherical surface with a radius of 4.0 cm?
a. 2.8 N / m2/C b. 1.7 N / m2/C c. 2.3 N / m2/C d. 4.0 N / m2/C e. 9.1 N / m2/C
An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
a. work must be done on the gas to return it to its original volume. b. heat must be exchanged with the surroundings to return the gas to its original temperature. c. its internal energy has a greater value after the expanded gas is returned to its original volume and temperature. d. of all of the above. e. of (a) and (b) above only.
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 x 10-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is __________
Fill in the blank(s) with correct word
An iron-80 atom %
