If a crystal has a fourfold axis of symmetry, the crystal can be rotated by _________degrees about this axis and the diffraction pattern will look exactly the same.
Fill in the blank(s) with the appropriate word(s).
90
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A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the horizontal component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s
Most astronomers agree to interpret ________ Law to mean that the present day universe is expanding
Fill in the blank(s) with correct word
The radiation curve for a blue hot star peaks in the
A) infrared region. B) red region. C) yellow region. D) ultraviolet region. E) none of the above
When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
a. r. b. r2. c. r3. d. r4. e. r6.