A lens has a refractive power of -1.50. What is its focal length?
A. 150 cm
B. -150 cm
C. 67.0 cm
D. -67.0 cm
E. 8.50 cm
D. -67.0 cm
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One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T b. 5.0 ?T c. 3.0 ?T d. 7.0 ?T e. 1.0 ?T
The image of an object at the focal point of a concave spherical mirror
a. looks the same as the object. b. is said to be formed at infinity. c. is real. d. is reduced.
Minimal orbital speed about Earth is about 8 km/s, and about the Moon is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.
What is the current dominant geological process on Mars?
a. plate tectonics b. volcanism c. wind erosion d. water erosion e. cratering