A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing by
A) 2.
B) 3.
C) 4.
D) 5.
E) none of the above
Answer: B
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Suppose a 0.30-kg mass on a spring-loaded gun that has been compressed 0.20 m has elastic potential energy of 1.0 J. How high above the spring's equilibrium point can the gun fire the mass if the gun is fired straight up?
a. 0.10 m c. 0.24 m b. 0.34 m d. 0.14 m
The superposition principle has to do with which of the following?
a. effects of waves at great distances b. the ability of some waves to move very far c. how displacements of interacting waves add together d. relativistic wave behavior
How far from a converging lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
Lens-Maker Formula: A double-convex thin glass lens has equal-magnitude radii of curvature. The focal length of this lens is +31.2 cm and the index of refraction of the glass is 1.52. The lens is to be replaced with a plano-convex glass lens of the same focal length and thickness. The radius of curvature of the convex surface of the replacement lens is 13.0 cm. What should be the index of refraction of the glass of the plano-convex lens?
A. 1.42 B. 1.44 C. 1.40 D. 1.38 E. 1.36