Dimensional Analysis: The period P of oscillation of a pendulum (the time interval needed to complete one full oscillation) can be expressed in terms of the mass m of the plumb bob, the length L of the string, and the acceleration due to gravity, g, as P =kmbLcgd, where k, b, c, and d are dimensionless constants. What must be the values of b, c, and d?
What will be an ideal response?
b = 0, c = 1/2, d = -1/2
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If you carry a heavy bag of groceries and bang your hand against the wall, the concept that best explains why your hand hurts is
A) inertia. B) gravity. C) resistance. D) none of the above
Gravity is an attractive force between
A. all objects everywhere B. Earth and objects on Earth C. Earth and Moon, and objects on Earth D. all massive objects
The difference between a LED and a laser is that a LED has spontaneous photon emission, and a laser has _________photon emission.
Fill in the blank(s) with the appropriate word(s).
The position of a particle as it moves along the x axis is given for t > 0 by x = (t3 ? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
a. 3 m b. 4 m c. 8 m d. 2 m e. 7 m