Linear momentum __________ conserved
Fill in the blank(s) with correct word
is
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The current density magnitude 
What is the one piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) the crater from this impact can still be seen in the deserts of Arizona B) a layer of sediment laid down at that time contains grains of shocked quartz, solidified rock droplets, and soot from global wildfires C) a layer of sediment laid down at that time is littered with dinosaur fossils D) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years
A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s
The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats? The speed of sound in air is 343 m/s. A) 5000 Hz B) 4500 Hz C) 8490 Hz D) 9000 Hz E) 4250 Hz
Total internal reflection can occur when a light ray moves across a boundary between different materials in which direction?
A. From a material with a slower speed of light to a material with a faster speed of light B. From the material with the faster speed of light, into the material with the slower speed of light C. Parallel to the surface, but only if the ray is polarized D. Exactly perpendicular to the surface, no matter what the indices of refraction