A 2.0-m long piano string of mass 40 g is under a tension of 338 N. Find the speed with which a wave travels on this string
a. 130 m/s
c. 520 m/s
b. 260 m/s
d. 1040 m/s
A
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Answer the following statement(s) true (T) or false (F)
All irreversible processes involve 1. macroscopic objects, 2.transfers to an object’s thermal energy, T or F? (One or both answers may be debatable!)
Which statement accurately describes how observations of distant galaxies help us learn about galaxy evolution?
A) By observing galaxies with different lookback times, we learn how galaxies appeared at different stages of their evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can watch as two galaxies merge and view the result, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) determine the distance to the star from its apparent brightness B) determine both the star's distance and luminosity from its apparent brightness C) calculate the star's surface temperature if we know either its luminosity or its distance D) calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity
An airplane flies horizontally with a speed of 300 m/s at an altitude of 400 m. Assume that the ground is level. At what horizontal distance from a target must the pilot release a bomb so as to hit the target?
a. 3.0 km b. 2.4 km c. 3.3 km d. 2.7 km e. 1.7 km