An example of a diatomic molecule of an element is
a. He
b. N2
c. P4
d. CO
b
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Suppose we suspend a negatively charged ball like a pendulum inside a hollow but completely enclosing metal box. Assume that the ball hangs a few inches from the box’s left vertical face. Imagine that we now bring a very strong positively charged object to a point just to the left of the box’s left face, so that it is only a few inches away from the suspended ball (though the box’s left face is between them). The ball will be deflected
A. strongly toward the external object. B. strongly away from the external object. C. weakly toward the external object. D. weakly away from the external object. E. not the least little bit.
Energy and Mass: If the mass of a 1.0-kg book could be entirely converted into electrical energy, how many kW ? h of energy would that generate? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The number of nodes in a standing wave of three wavelengths, not including the endpoints, is
A) 2. B) 3. C) 4. D) 5. E) 6.
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s b. 25 m/s c. 30 m/s d. 21 m/s e. 17 m/s