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 25.0 seconds from the start?
A. 0.47 
B. 0.40
C. 0.34
D. 0.24
E. 0.20
C. 0.34
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What was the main difference between the time capsules carried on the Pioneer probes and the time capsules carried on the Voyager probes?
A) no difference, the time capsules were identical B) the time capsule on Voyager contained a record with video and audio messages C) the time capsule on Pioneer contained a record with video and audio messages D) the time capsule on Voyager contained video, but no audio
Photography Optics: A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen. Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens.(a) What magnification does the projector produce?(b) How far from the lens should the screen be placed?(c) What focal length projector lens is needed?
What will be an ideal response?
A single slit, which is 0.0500 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
What will be an ideal response?
A steel bracket ABC (EI 5 4.2 106 N?m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum horizontal displacement of joint C is approximately:
(A) 22 mm
(B) 31 mm
(C) 38 mm
(D) 40 mm
