When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not? (Assume we are looking with visible light telescopes.)
A) Yes, distant galaxies appear as small, fuzzy patches of light within the Milky Way band.
B) yes, but only when we look in the direction of the constellation Sagittarius
C) no, because the stars, gas, and dust of the Milky Way block our view of more distant objects
D) no, because galaxies exist only above and below the plane of the Milky Way
E) no, because distant galaxies are too dim to be seen even with powerful telescopes
C) no, because the stars, gas, and dust of the Milky Way block our view of more distant objects
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A ball is thrown with a velocity of 40 m/s at an angle of 30° above the horizontal and attains a certain range R. At what other angle will this ball attain the same range keeping its initial velocity the same?
A) 15° B) 90° C) 120° D) 60° E) All other angles will give different ranges.
A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m2. The bulk modulus for this steel is 1.6 × 1011 N/m2. What is the change in the radius of the sphere?
A) -0.021 mm B) -4.2 mm C) -0.42 mm D) -0.19 mm E) -0.062 mm
A sound wave coming from a tuba has a wavelength of 1.10 m and travels to your ears at a speed of 253 m/s. What is the frequency of the sound you hear?
a. 278 Hz b. 1/278 Hz c. 230 Hz d. 1/230 Hz e. 252 Hz
A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/A)
A) 4.7 µT B) 20 µT C) 6.4 µT D) 56 µT