A box slides up an incline with an angle of elevation ?. When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction. What is the minimum value of the coefficient of static friction for this to occur?
a. ?s = tan? b. ?s = sin?
c. ?s = cos? d. ?s = 1
a
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 2.0 seconds from the start?
A. 0.37 
B. 0.30
C. 0.28
D. 0.21
E. 0.16
A force of 3.8N directed along the positive x-axis combines with a second force directed along the positive y-axis to produce a total force vector of magnitude 6.1N. What is the magnitude of the second vector?
A. 2.7N B. 9.5N C. 23.5N D. 4.8N E. Not enough information is given.
When it is 12 noon, May 6, in Perth, Australia (33°S, 116°E), what are the standard time and date in Ottawa, Canada (44°N, 76°W)?
What is the total energy stored by C3 when C1 = 50 ?F, C2 = 30 ?F, C3 = 36 ?F, C4 = 12 ?F, and V0 = 30 V?
a.
6.3 mJ
b.
25 mJ
c.
57 mJ
d.
1.6 mJ
e.
14 mJ