A researcher is investigating a cubic crystal with x-rays. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x-rays of 0.165 nm a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in the crystal?
0.207 nm
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A worker pushes a wheelbarrow with a horizontal force of 50.0 N over a level distance of 5.0 m. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
a. 250 J b. 0.0 J c. 35 J d. 10.0 J
Exhibit 12-3
The graph below shows a plot of angular velocity in rad/s versus time in s from t = 0 s to t = 7 s.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 12-3. The change in angular position, ??, during the 7-second period is
A. 21 rad, CW. B. 21 rad, CCW. C. 30 rad, CW. D. 30 rad, CCW. E. 39 rad, CCW.
The only metal that does not oxidize is _________.
Fill in the blank(s) with the appropriate word(s).
A brass cube, 15.0 cm on a side, is raised in temperature by 170°C. The coefficient of volume expansion of brass is 57 × 10^?6/C°. By what percentage does volume increase?
a. 33% b. 1.4% c. 1.0% d. 3.4% e. 2.81%