The ciliary muscle is instrumental in changing the shape of which eye part?
a. iris
b. lens
c. pupil
d. retina
b
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A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. Which of the following describes the image?
A. real and inverted B. real and upright C. virtual and inverted D. virtual and upright E. not possible to determine
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 tangential velocity of a point 4.0 cm from the center at the time 2.0 seconds from the start?
A. 0.060 m/s B. 0.080 m/s C. 0.10 m/s D. 0.14 m/s E. 0.18 m/s
A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm. What is the angular magnification of the telescope?
a. 30 b. 33 c. 75 d. 140 e. 103
A supertrain (rest-length = 100 m) travels at a speed of 0.950c as it passes through a tunnel (rest-length 50.0 m). As seen by a trackside observer, is the train ever completely within the tunnel? If so, by how much?
What will be an ideal response?