The focal length of a convex mirror is -20 cm. What is its radius of curvature?
A) -10 cm
B) 40 cm
C) -40 cm
D) -20 cm
E) 20 cm
C
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As with the lunar mare and Earth's ocean basins, the chief rock in the low plains of Venus is ________
Fill in the blank(s) with correct word
Why can radio waves get through the dust clouds, but light is blocked?
What will be an ideal response?
Two concentric circular wire loops in the same plane each carry a current. The larger loop as a current of 8.46 A circulating clockwise and has a radius of 6.20 cm. The smaller loop has a radius of 4.42 cm. What is the magnitude and direction of the current in the smaller loop if the total magnetic field at the center of the system is zero?
A. 6.03 A CCW B. 6.03 A CW C. 12.8 A CCW D. 12.8 A CW
Gasoline is useful in cars because it has
A) chemical potential energy. B) electrical potential energy. C) kinetic energy. D) gravitational potential energy. E) radiative energy.