Which mineral, quartz or feldspar, will crystallize first? Why?
What will be an ideal response?
Answer: Minerals with high silica content are the last to crystallize. Feldspar, with its lower percentage of silica, will crystallize before quartz, which is 100% silica.
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A ray of light passes from glass into a liquid, as shown in the figure. What is the speed of the light in the liquid? (c = 3.00 × 108 m/s)
What will be an ideal response?
The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m
a.
3.7 m/s
b.
4.4 m/s
c.
4.9 m/s
d.
5.4 m/s
e.
14 m/s
The center of mass of a system of particles (or objects) with total mass M moves like a single particle of mass M acted upon by the same net external force
Indicate whether the statement is true or false
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. ?0.64 kJ b. ?0.40 kJ c. ?0.52 kJ d. ?0.28 kJ e. ?0.76 kJ