Equilibrium: A 40-kg uniform ladder that is 5.0 m long is placed against a smooth wall at a height of h = 4.0 m, as shown in the figure. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction with the ladder is 0.40. An 80-kg bucket is suspended from the top rung of the ladder, just at the wall. What is the magnitude of the force that the ladder exerts on the wall?
A. 740 N
B. 1300 N
C. 980 N
D. 900 N
E. 1100 N
Answer: A
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Which of the following is not consistent with the major hallmarks of science?
A) A scientific model must make testable predictions. B) Science progresses through the creation and testing of models that explain observation as simply as possible. C) Scientific explanations should be based solely on natural causes. D) Science consists of proven theories that are understood to be true explanations of reality.
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions
What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s) A) 162 N/C B) 212 N/C C) 82.1 N/C D) 150 N/C E) 52.9 N/C
The Bohr model of the hydrogen atom predicts an ionization energy of 13.6 eV. With this model one would expect the ionization energy of the Li++ ion to be
A) 122.4 eV B) 40.8 eV C) 54.4 eV D) 27.2 eV E) 79.6 eV
How much energy is stored in a room 3.0 m by 4.0 m by 2.4 m due to the earth's magnetic field with a strength of 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A) 575 mJ. B) 570 mJ. C) 29 mJ. D) 100 mJ. E) 10 mJ.