An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level
A) rises.
B) falls.
C) remains unchanged.
Answer: C
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Active galaxies emit most of their energy in ________ wavelengths than visible
Fill in the blank(s) with correct word
Alpha particles, each having a charge of +2e and a mass of 6.64 × 10-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m. The field is perpendicular to the velocity of the particles
How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10-19 C) A) 0.15 ?s B) 0.25 ?s C) 0.33 ?s D) 0.40 ?s E) 0.49 ?s
Minimal orbital speed about Earth is about 8 km/s, and about the Moon is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.
Which of the following is not a method astronomers use to determine the physical conditions inside the Sun?
A) detecting solar neutrinos generated in the Sun's core B) measuring Doppler shifts to observe solar vibrations C) observing X-ray images of the solar interior using satellites D) building mathematical models that use the laws of physics E) both C and D