Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4sin(5x)cos(6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz
b. 1 Hz
c. 6 Hz
d. 12 Hz
e. 5 Hz
b
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Why do disks form around young stars?
A) The surrounding gas can only approach the star from a single direction. B) Collisions between gas particles flatten the rotating gas cloud. C) The rotation of the cloud causes gas to be spun outward from the central star. D) Intense winds from nearby massive stars flatten the gas cloud.
Simple Harmonic Motion: The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?
A. 30.5 µs B. 15.3 µs C. 95.8 µs D. 0.191 ms E. 9.71 µs
How does the lava that forms a steep-sided volcano (a stratovolcano) compare to the lava that forms a shallow-sloped volcano (a shield volcano)?
A) The lava is thicker (higher viscosity) for the steep-sided stratovolcano. B) The lava is runnier (lower viscosity) for the steep-sided stratovolcano. C) The lava comes from deeper in Earth's mantle for the steep-sided stratovolcano. D) The lava comes from a very shallow layer of Earth's crust for the steep-sided stratovolcano. E) The lava contains more metal for the steep-sided stratovolcano.
Temperature is a measure of heat
a. True b. False Indicate whether the statement is true or false