A wave on a string has a wavelength of 0.90 m at a frequency of 600 Hz. If a new wave at a frequency of 300 Hz is established in this same string under the same tension, what is the new wavelength?
a. 2.7 m b. 1.8 m
c. 0.45 m d. 0.30 m
b
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A 600-kg geosynchronous satellite has an orbital radius of 6.6 Earth radii. What gravitational force does Earth exert on the satellite?
A. 13.8 N B. 90.9 N C. 138 N D. 909 N
How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder. B. It is not exploding. C. It is not collapsing. D. All of these choices are correct. E. None of these choices are correct.
Cosmic rays are made of photons
a. True b. False Indicate whether the statement is true or false
If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would heat up, fusion rates would increase, the core would re-expand. B) The core would cool off and continue to shrink as its density increased. C) The density of the core would decrease, causing the core to cool off and expand. D) The core would heat up, causing it to radiate so much energy that it would shrink even more.