How do you determine if a particular torque should be considered + (positive) or – (negative)?
By convention a torque that could produce a counter-clockwise rotation is +
(positive), a torque that could produce a clockwise rotation is – (negative).
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A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x = 4.0 m and y = -4.0 m because of this charge?
A) 18 × 103 V B) -18 × 103 V C) 0 V D) 36 × 103 V E) -36 × 103 V
A cyclotron is designed with a magnet that produces 1.2 T. When refurbished, the magnet is replaced by one that produces 1.5 T. How does the kinetic energy developed by the protons change compared to the previous energy developed?
A) It increases by 25%. B) It decreases by 25%. C) It increases by 56%. D) It decreases by 56%. E) It does not change.
Where is the sun located relative to a planet's orbit about it?
a. at the center of the orbit, which is a circle b. at the center of the orbit, which is an ellipse c. at one focus of the ellipse which forms the orbit d. none of the above
What causes chromatic aberration?
A. the index of refraction is a function of wavelength B. the outer edges of the lens produce a focus at a different point from the central rays C. the absorption of light in the glass is a function of wavelength D. the coefficient of reflection is a function of wavelength