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
b
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A person's eye lens is 2.7 cm away from the retina. What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina?
A) -3.4 cm B) -2.4 cm C) 2.4 cm D) 3.4 cm E) 2.6 cm
The four fundamental forces that operate in the universe today are ________
A) strong force, weak force, electromagnetic force, gravity B) nuclear force, electromagnetic force, gravity, tidal force C) nuclear force, gravity, electric force, magnetic force D) strong force, weak force, electric force, magnetic force
A car travels around a curve with constant speed. The correct statement from the following is
A. the car has zero acceleration. B. the car has an acceleration directed in the instantaneous direction of the velocity vector. C. the velocity of the car is constant. D. the car has an acceleration directed inward toward the center of the curve. E. the car has an acceleration directed outward from the center of the curve.
According to quantum field theory, the essential reality is
A) quarks, electrons, neutrinos, and their anti-particles. B) electromagnetic radiation. C) chocolate fudge. D) a few fields. E) particles moving in empty space.