A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm)
a. 72
b. 25
c. 33
d. 100
e. -33
C
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According to Copernicus, the retrograde motion for Mars must occur:
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
Which of the following is not implied by this diagram?
A) There are six distinct forces known to operate in the universe, and a seventh force called the "super force" might also exist. B) At very high temperatures, the electromagnetic and weak forces are no longer distinct but instead act as a single electroweak force. C) At the current temperature of the universe, gravity is the weakest of the forces. D) At the current temperature of the universe, the strong force is the strongest of the forces.
Which of the following situations would result in the longest days during the summer? (Assume an axis tilt of 0 degrees is an axis perpendicular to the ecliptic plane.)
A) axis tilt 0 degrees B) axis tilt -10 degrees C) axis tilt 23.5 degrees D) axis tilt 90 degrees
Atomic Nucleus: The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A. 3.6 × 10-13 B. 7.1 × 10-5 C. 5.1 × 10-9 D. 2.6 × 10-17