38. Round off each of the following numbers to two significant digits, and express the result in standard scientific notation.
a. 1,566,311
c. 0.07759
b. 2.7651 X 10-3
d. 0.0011672

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?