Spherical Mirrors: An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?
A. 1.0 cm
B. 2.0 cm
C. 8.0 cm
D. 16 cm
Answer: D
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Banked Curves: Two cars go around a banked curve at the proper speed for the banking angle. One car has tires with excellent traction, while the other car has bald slippery tires. Which of these cars is more likely to slide on the pavement as it goes around the curve?
A. the car with the new tires B. the car with the bald tires C. Neither car will slide. D. It depends on if the pavement is wet or dry.
Camera Optics: The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A. It does not make any difference. B. sideways from the CCD sensors C. away from the CCD sensors D. towards the CCD sensors
Where do mountains like the Himalayas come from?
A. The Earth is made of molten rock and metals, and regions with opposite electrical charges attract each other and form peaks. B. The Earth formed by an irregular processes and that is just the way that it was shaped when the molten rock cooled into place. C. The Moon's gravity pulls some layers up into mountain ranges. D. In some locations, plates of rock on the planet's surface press together and the plates rise together. E. Rain of debris from meteorites and comets falls in some places more than others, and builds up into mountains.
Angular momentum is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (nearest point). C) same at apogee and perigee