The force of air impact upon the sail of a boat is greater if the air
A) bounces upon impact.
B) encounters the sail head-on.
C) encounters the sail at a grazing angle.
Answer: B
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When something cannot be directly observed, it can be represented by a?
A. hypothesis B. model C. graph D. theory
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 20° with a speed of 24.5 m/s. What is the minimum coefficient of static friction required for the car not to skid?
A) 0.12 B) 0.24 C) 0.36 D) 0.48 E) 0.60
A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm
Monochromatic light of a different wavelength is now shown on the tube, and the stopping potential is measured to be 2.30 V. What is the wavelength of this new light? (c = 3.00 × 108 m/s, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 320 nm B) 300 nm C) 340 nm D) 360 nm E) 410 nm
Two observers, A and B, move relative to each other. A claims B's clocks run slow. In this case, B will claim A's clocks
a. run fast c. are no good b. run slow, too d. none of the above