What does partial melting have to do with silica content of a magma?
What will be an ideal response?
Answer: Partial melting produces magmas with a higher silica content than the parent rock because the high silica content minerals are the first to melt and the lower silica content minerals are left unmelted.
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Projectile Motion: A ball rolls over the edge of a platform with a horizontal velocity of magnitude v. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m. What is the magnitude of v if air resistance is negligibly small?
Fill in the blank(s) with the appropriate word(s).
Why does ice float on water?
a. Ice is hydrophobic and repels water. b. Water molecules have less mass the colder they get. c. Water molecules are spaced farther apart in ice than in liquid water. d. Vibrating electrons in liquid water push ice to the surface. e. Hydrogen bonds are weaker in ice.
Potential: A tiny particle with charge + 5.0 ?C is initially moving at 55 m/s. It is then accelerated through a potential difference of 500 V. How much kinetic energy does this particle gain during the period of acceleration?
A. 1.0 × 104 J B. 2.5 × 10-3 J C. 100 J D. 2500 J
A glass flask has a volume of 500 mL at a temperature of 20°C. The flask contains of mercury at
The temperature of the mercury and flask is raised until the mercury reaches the reference mark. The coefficients of volume expansion of mercury and glass are 18 × 10-5 K-1 and 2.0 × 10-5 K-1, respectively. The temperature at which this occurs is closest to A) 122°C. B) 112°C. C) 102°C. D) 110°C. E) 132°C.