A horizontal force acts on a block that is initially at rest but free to move across a smooth horizontal surface. The work done by this force ________ (increases; does not change; decreases) the kinetic energy of the block.
Fill in the blank(s) with the appropriate word(s).
increases
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A man in a gym is holding an 8.0-kg object at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the object if his arm is horizontal?
A) 0.24 N ? m B) 4.4 N ? m C) 43 N ? m D) 15 N ? m E) 0 N ? m
Which of the following is NOT true about pseudo streaming?
A. Files are typically small. B. Another term for pseudo streaming is progressive downloading. C. The term pseudo means fake or simulated. D. There may be delays in playback as it downloads.
Wavelengths of light are most efficiently measured in:
a. meters. b. inches. c. millimeters. d. centimeters. e. nanometers.
Which of the following gases absorbs ultraviolet light best?
A) carbon dioxide B) nitrogen (N2) C) the oxygen we breathe (O2) D) hydrogen E) ozone (O3)