The melting point of silicate minerals is strongly dependent on the amount of silica they contain. Generally speaking, which minerals are the first to melt?
What will be an ideal response?
Answer: The first minerals to melt are those with the lowest melting point and highest silica content.
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An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2. What is the capacitance of this capacitor with air between these plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 89 pF B) 8.9 nF C) 8.9 pF D) 0.89 pF E) 8.9 µF
The velocity of a particle (m = 10 mg, q = ?4.0 ?C) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
a. 60 m/s b. 20 m/s c. 45 m/s d. 40 m/s e. 70 m/s
To scale, if Earth were the size of a basketball, then the Moon would be about the size of a
A) bowling ball. B) tennis ball. C) ping-pong ball. D) marble.
What observation made of other stars seems to suggest the solar nebula theory is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low-mass red dwarfs. d. Young stars are found to have hot disks that surround them.