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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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 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.
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
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