A wheel having a moment of inertia of 5.00 kg ? m2 starts from rest and accelerates under a constant torque of 3.00 N ? m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
A) 57.6 J
B) 64.0 J
C) 78.8 J
D) 122 J
A
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When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by
a. polarization of light in scattering and partial absorption by the threads. b. interference of light waves that pass through the threads with light waves that pass through the openings between the threads. c. refraction of light waves differentially in the cylindrical threads. d. diffraction of light waves passing through the two dimensional pattern of openings between the threads. e. reflection of light waves by the sides of the threads.
Which of the following does not provide evidence that Mars once had abundant liquid water on its surface?
A) the presence of features that look like dried up river beds B) the presence of what looks like sedimentary layers in some crater bottoms C) the presence of very old craters that appear to have been eroded by rain D) the presence of canali, discovered in the late 1800s by Giovanni Schiaparelli and mapped by Percival Lowell
On average, how fast do the plates move on the Earth?
A) a few millimeters per century B) about 1 mile per hour C) a few centimeters per year D) a few kilometers per year
Three resistors,
and 
are connected in parallel to a 9.0 V battery. What is the power dissipated by the 
?
A. 2.0 W B. 3.0 W C. 9.0 W D. 27 W E. 81 W