A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
A) 0 Hz
B) 82 HZ
C) 166 Hz
D) 249 Hz
C
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The left-hand end of a glass rod is ground to a spherical surface. The glass has index of refraction 1.50. A small object 4.00 mm tall is placed in the axis of the rod, 11.0 cm to the left of the vertex of the spherical surface
The image is formed in the rod, 17.0 cm to the right of the vertex. (a) What is the magnitude of the radius of curvature of the spherical surface at the end of the rod? (b) What is the height of the image?
Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
A) 5 m/s. B) 11 m/s. C) either depending on her running direction D) none of the above
In an elastic collision, one ball has initial velocity v and strikes another, much less massive ball, that is initially at rest in a head-on collision. The velocity of the second ball after the collision is equal to:
A. v B. 2v C. v/2 D. -v E. something else
The maximum magnification of a typical light optical microscope is
(a) 100,000 times (b) 10,000 times (c) 1000 times (d) 100 times