How many valence electrons does boron (B, atomic no. = 5) have?
A) 1
B) 2
C) 3
D) 4
E) 5
Answer: C
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Uniform Circular Motion: The Moon is 3.84 × 108 m from Earth and takes 27.3 days to complete each orbit. What are the magnitude and direction of the acceleration of the Moon, assuming a circular orbit?
What will be an ideal response?
Motional Emf: A conducting rod whose length is ? = 27.0 cm is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 5.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 1.20 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the right with a constant speed. At what speed should the rod be pulled so that the lightbulb will consume energy at a rate of 1.10 W?
A. 2.00 m/s B. 3.50 m/s C. 4.26 m/s D. 6.00 m/s E. 7.24 m/s
All the following statements are true. Which one follows directly from Kepler's third law (p2 = a3)?
A) Venus orbits the Sun at a slower average speed than Mercury. B) Venus is more massive than Mercury. C) Venus takes longer to rotate than it does to orbit the Sun. D) Venus has a thicker atmosphere than Mercury.
If a particle in a rigid box has a ground state energy of 1 eV, how much higher in energy is the next state?
A) 2 eV B) 4 eV C) 3 eV D) 5 eV E) 1 eV