The reason we don't see stars in the daytime is because
A) the sky is too bright.
B) stars shine only at night.
C) there are no stars in the direction of the Sun.
D) stars disappear in the daytime.
A) the sky is too bright.
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Which of the following types of galaxies are most spherical in shape?
A) spirals B) ellipticals C) lenticulars D) irregulars
A ______________________ universe is Sun centered
Fill in the blank(s) with correct word
The ratio of the kinetic energy of object A to the kinetic energy of the object B is 2:1. The mass of object A is 2.0 kg and the mass of object B is 4.0 kg. If object A has a speed of 4.0 m/s, what is the speed of object B?
A) 8.0 m/s B) 6.0 m/s C) 4.0 m/s D) 1.4 m/s E) 2.0 m/s
Which of the following best describes a sound level of intensity 10–6 W/m2?
a. extremely loud c. normal conversation b. about that of a power mower d. like a whisper