What is meant by a cosmological distance?
What will be an ideal response?
A distance on the scale of the universe. An object at this distance will show an extremely large redshift.
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A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. The fundamental frequency of the stretched string is in tune with the frequency of the second mode of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. If the temperature of the air decreases by 20
then what is the length of the organ pipe?
A. 75.0 cm B. 100 cm C. 125 cm D. 150 cm E. 175 cm
A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
y). What is the frequency of the vibration of the wave?
A. 319 Hz B. 289 Hz C. 240 Hz D. 199 Hz E. 150 Hz
How large should a wall-mounted mirror be to view the upper half of one's height, h?
a. h c. h/4 b. h/2 d. The answer is not given.
This photo shows
A) an asteroid B) Pluto C) a dwarf planet D) Mercury