The force an ideal spring exerts on an object is given by Fx = -kx, where x measures the displacement of the object from its equilibrium (x = 0) position. If k = 60 N/m, how much work is done by this force as the object moves from x = -0.20 m to x = 0?
a. -1.2 J
b. +1.2 J
c. +2.4 J
d. -2.4 J
e. +3.6 J
B
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Determine the magnitude of the Burger’s vector in MgO, shown in Figure 3.10, that has the NaCl crystal structure with a lattice parameter of 0.4212 nm, and compare the magnitude of this Burger’s vector to that of copper. Note that the Burger’s vector is in the [110] direction in MgO.
What will be an ideal response?
By convention, the direction of current in a circuit is
A) from the positive terminal of a source to the negative terminal. B) the direction in which positive charge flows. C) both of these D) neither of these
How did Galileo know that the planets go around the sun rather than around Earth?
A) From telescopic observations of the phases of Venus as it moves around the sun. B) From telescopic measurements of the positions of the stars as Earth moved around the sun during the course of one year. C) From the writings of Aristarchus, the ancient Greek astronomer. D) By noting that Venus always lies near the sun, as seen from Earth, from which he concluded that Venus must be orbiting the sun. E) From measurements of the tides raised by the moon as compared with the tides raised by the sun.
The compound BeF2 is named ______________
Fill in the blank(s) with correct word