Thin Lenses: How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?
A. 46 mm
B. 52 mm
C. 58 mm
D. 67 mm
Answer: D
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A transverse periodic wave is represented by the equation y(x, t) = A1 sin
Another transverse wave is represented by the equation y(x, t) = A2 sin
What is the equation that represents the superposition of the two waves?
A. y(x, t) = (A1+A2) sin
cos(kx) + (+A1+A2) cos
sin(kx)
B. y(x, t) = (A1+A2) sin
cos(kx) + (-A1-A2) cos
sin(kx)
C. y(x, t) = (A1-A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
D. y(x, t) = (A1+A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
What would be the next step in the scientific process for the Copernican heliocentric model?
In 1500s, Copernicus reintroduced the heliocentric model that the ancient Greeks had rejected, and it began to gain favor among some scientists. He suggested that the planets all orbit around the Sun in perfect circles, as shown in the figure to the right. This offers a much more elegant explanation of retrograde planetary motion than the geocentric model.
Rhombohedral cleavage is displayed by the mineral named
a. quartz. b. fluorite. c. calcite. d. hematite.
A parallel-plate capacitor filled with air carries a charge Q. The battery is disconnected, and a slab of material with dielectric constant K = 2 is inserted between the plates. Which of the following statements is true?
1.The voltage across the capacitor decreases by a factor of 2. 2.The voltage across the capacitor is doubled. 3.The charge on the plates is doubled. 4.The charge on the plates decreases by a factor of 2. 5.The electric field is doubled.