A meniscus lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm. If the glass used has index of refraction 1.50, what is the focal length of this lens?
A)
-32 cm
B)
32 cm
C)
113 cm
D)
67.5 cm
E)
-113 cm
C
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In an LCR series circuit with XL > XC, the phase angle between the current and voltage phasors is 30°. If the AC frequency doubles, what is the magnitude of the resulting phase angle?
a. 30° b. less than 30° c. more than 30° d. Additional information is needed to reach a determination.
Based on current estimates of the value of Hubble's constant, how old is the universe?
A) between 4 and 6 billion years old B) between 8 and 12 billion years old C) between 12 and 16 billion years old D) between 16 and 20 billion years old E) between 20 and 40 billion years old
In Earth's interior, does temperature increase or decrease with depth?
What will be an ideal response?
An aircraft starts at rest and is accelerated at 10 m/s2 for 30 seconds, at which time the aircraft becomes airborne. What is the distance traveled during the 30 seconds? Assume the acceleration is constant