As a projectile thrown upward at a non-vertical angle moves in a parabolic path, as in the figure, at what point along its path are the velocity and acceleration vectors for the projectile perpendicular to each other?
4
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A car starts from rest and reaches 20 m/s in 5 seconds. The average acceleration of the car is
A. 1.0 m/s2. B. zero m/s2. C. 4.0 m/s2. D. 10.0 m/s2. E. 2.0 m/s2.
Earth's atmosphere is most transparent to all wavelengths of ________ light.
A) infrared B) visible C) ultraviolet D) x-ray E) both visible and ultraviolet
According to special relativity, two events that occur simultaneously in one frame of reference
A) are also simultaneous in all frames of reference. B) can be non-simultaneous in another frame of reference. C) is evidence for the constant speed of light. D) are in reality non-simultaneous.
Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?
A) Spring B) Summer C) Fall D) Winter