A person standing waist-deep in a swimming pool appears to have short legs because of light
A) reflection.
B) absorption.
C) interference.
D) diffraction.
E) refraction.
Answer: E
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The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that four of your neighbors are all mowing their lawns using identical "Super-Silent" mowers
When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 80 dB B) 104 dB C) 400 dB D) 50 dB E) 40 dB
When you lift a heavy 5.0 kg crate straight up from ground level to a height of 2.0 m above ground level, then you have changed the crate's gravitational potential energy by
A. 98 N. B. an undetermined amount, because it depends on how fast you lifted it. C. 98 m2/s2. D. 98 J. E. 98 kg m/s.
Why can a 25. watt fluorescent lamp produce as much illumination as a 100. watt incandescent lamp?
What will be an ideal response?
If the radius of the Earth somehow increased with no change in mass, your weight would
A) increase. B) not change. C) decrease.