Spherical Mirrors: An object that is 2.0 cm tall is placed at the center of curvature in front of a concave mirror. How tall is its image?
A. 0.50 cm
B. 1.0 cm
C. 1.5 cm
D. 2.0 cm
E. infinite
Answer: D
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Two astronauts of equal mass are holding on to each other and moving at a speed of 30 m/s. They push off of each other and one of the astronauts moves in the same direction as the two were initially moving but at 60 m/s. The velocity of the second astronaut is
A. 30 m/s forward. B. 60 m/s forward. C. 60 m/s backward. D. zero. E. 30 m/s backward.
At the microscopic level, the difference between gases and solids is that
A) there is much more distance (at least 10 times more) between neighboring atoms in a gas than between neighboring atoms in a solid. B) the gas's atoms move throughout the gas, while the solid's atoms remain near their original locations. C) in a gas, the individual atoms are larger. D) both answers A and B are correct. E) both answers B and C are correct.
Optical fibers work because of __________
Fill in the blank(s) with correct word
At a distance of 14,000 km from the center of Planet Z-99, the acceleration due to gravity is 32 m/s2. What is the acceleration due to gravity at a point 28,000 km from the center of this planet?
A) 8.0 m/s2 B) 16 m/s2 C) 128 m/s2 D) 4.0 m/s2 E) 2.0 m/s2