Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at both ends has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column in this tube?
A. 32 Hz
B. 64 Hz
C. 88 Hz
D. 128 Hz
E. 256 Hz
Answer: D
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Intensity: The average intensity of sunlight impinging on Earth is measured to be about 1.4 kW/m2. What is the power of sunlight emitted by the sun? (Earth-Sun distance = 1.5 × 108 km, Earth radius = 6.4 × 103 km)
A. 4.0 × 1026 W B. 3.2 × 1022 W C. 7.2 × 1014 W D. 7.6 × 108 W
Why are the inner planets made of denser materials than the outer planets?
A) The Sun's gravity pulled denser materials toward the inner part of the solar nebula, while lighter gases escaped more easily. B) Denser materials were heavier and sank to the center of the nebula. C) In the inner part of the nebula only metals and rocks were able to condense because of the high temperatures, whereas hydrogen compounds, although more abundant, were only able to condense in the cooler outer regions. D) When the solar nebula formed a disk, materials naturally segregated into bands, and in our particular solar system the denser materials settled nearer the Sun while lighter materials are found in the outer part. E) In the beginning, when the protoplanetary disk was spinning faster, centrifugal forces flung the lighter materials toward the outer parts of the solar nebula.
The gravitational force that the Sun exerts on Earth is much larger than the gravitational force that Earth exerts on the Sun
Indicate whether the statement is true or false
When an earthquake occurs, the location on Earth's surface above the point of initial energy release is called the earthquake's
a. fault line. b. focus. c. epicenter. d. none of the above.