Florence, who weighs 120 lb, stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 2.0 m/s2?
A) 86 lb
B) 1.4 × 102 lb
C) 96 lb
D) 1.2 × 102 lb
E) 1.6 × 102 lb
B
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Graphical Addition: The magnitude of the resultant of two vectors cannot be less than the magnitude of either of those two vectors.
A. True B. False
Argon rather than air is the gas used in incandescent bulbs because
A) it produces a pleasing bluish glow. B) oxygen in air oxidizes the lamp filament. C) argon is relatively plentiful. D) none of the above
The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature?
A) 10 cm B) 40 cm C) -40 cm D) 20 cm E) -20 cm
The force on a 0.500-kg particle depends on position such that F(x) = (1.00 N/m2)x2 + ( 4.00 N/m)x for a particle constrained to move along the x-axis
If the particle starts from rest at x = 0.00, what will be its speed when it reaches the position x = 4.00 m? A) 1.65 m/s B) 22.6 m/s C) 14.6 m/s D) 11.3 m/s E) The particle will not reach the position x = 4.00 m.