What is the composition of silicates?
Silicates are composed of one or more of the metals plus silicon and oxygen. Some
rocks contain several silicate groups.
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An airplane is traveling at 150 m/s in level flight. If the airplane is to make a change in direction, it must travel in a horizontal curved path. To fly in the curved path, the pilot banks the airplane at an angle such that the lift has a horizontal component that provides the horizontal centripetal acceleration to move in a horizontal circular path. If the airplane is banked at an angle of 12.0 degrees, then the radius of curvature of the curved path of the airplane is
A. 10.8 km. B. 8.74 km. C. 8.00 km. D. 7.33 km. E. 6.90 km.
When did the photons in the cosmic microwave background first travel freely through the universe?
A) the moment of the Big Bang B) about 10-10 second after the Big Bang C) about 5 minutes after the Big Bang D) about 380,000 years after the Big Bang E) At the time, the first stars began to shine in the universe.
Galileo observed all of the following. Which observation offered direct proof of a planet orbiting the Sun?
A) four moons of Jupiter B) patterns of shadow and sunlight near the dividing line between the light and dark portions of the Moon's face C) phases of Venus D) The Milky Way is composed of many individual stars.
At what angle (relative to the horizontal) should a curve 52.0 m in radius be banked if no friction is required to prevent the car from slipping when traveling at 11.6 m/s? (g = 9.80 m/s2)
a. 0.264° b. 1.30° c. 14.8° d. 2.59°