At which time of the year in Urbana, IL will your shadow in sunlight at midday be shortest?
What will be an ideal response?
the first day of summer, or about June 21
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A star of magnitude 1 appears ______________ times brighter than a star of magnitude 2
Fill in the blank(s) with correct word
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 378 Hz B) 389 Hz C) 411 Hz D) 422 Hz E) 450 Hz
A book is sitting on a desk top. Identify the 3rd law partner of the weight of the book.
A. the force of the desk on the book B. the force of the book on the desk C. the force of the earth on the book D. the force of the book on the Earth
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his angular momentum about the axis of rotation?
A) It does not change. B) It increases. C) It changes, but it is impossible to tell which way. D) It decreases.