A ball is thrown straight up with an initial speed of 30 m/s. What is its speed after 4.2 s?
A. 72 m/s
B. 42 m/s
C. 30 m/s
D. 11 m/s
D. 11 m/s
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Spherical Mirrors: A beam of light that is parallel to the principal axis strikes a concave mirror. What happens to the reflected beam of light?
A. It also is parallel to the principal axis. B. It is perpendicular to the principal axis. C. It passes through the center of curvature of the mirror. D. It passes through the focal point of the mirror. E. It passes between the focal point and the center of curvature of the mirror.
How far above the horizon is the Moon when its image reflected in calm water is completely polarized? (nwater = 1.333)
a. 53.12° b. 18.44° c. 22.20° d. 36.88°
Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the distance between the objective lens and the real image that it produces?
A. 116 mm B. 120 mm C. 124 mm D. 128 mm E. 132 mm
Which of the following is most sensitive to low-intensity light?
a. the green cones c. the red cones b. the blue cones d. the rods