The mass density of an object equals its _____ divided by its ________
Fill in the blank(s) with correct word
mass, volume
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Which of the following describes what will happen to a light ray incident on an air-to-glass boundary at less than the critical angle?
a. total reflection b. total transmission c. partial reflection, partial transmission d. partial reflection, total transmission
A guitar is perfectly tuned. The tension on its strings is then increased. Which of the following is true?
A. The speed of sounds from the guitar is larger than before B. The frequencies of sounds from the guitar are higher than before C. The wavelengths of sounds from the guitar are longer than before D. The amplitudes of sounds from the guitar are larger
On the day of the Autumnal Equinox and on the of the Vernal equinox the length of the daylight hours and nighttime hours are equal for everyone on Earth.
a. true b. false
A student wants to establish a standing wave on a wire 1.8 m long clamped at both ends. The wave speed is 540 m/s. What is the minimum frequency she should apply to set up standing waves?