An SEM is not suitable for viewing which of the following materials?
(a) Metals
(b) Ceramics
(c) Biological materials coated with a conductor
(d) Polymers coated with a conductor
(b) Ceramics
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Which of the following is true of the light emitted by the big bang gases?
A) It is detectable with infrared telescopes. B) It can no longer be used to detect the big bang. C) It is not detectable with radio telescopes. D) It can be seen with the unaided eye.
What are Kepler's three laws?
What will be an ideal response?
By what factor should the length of simple pendulum be changed in order to triple the period of vibrations?
a. 3 b. 6 c. 9 d. 1/3
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
A. 3.5 rad/s B. 3.8 rad/s C. 4.1 rad/s D. 2.0 rad/s E. 5.6 rad/s