An object undergoing simple harmonic motion takes 0.31 s to travel from one point of zero velocity to the next such point. The distance between those points is 45 cm. Calculate (a) the period, (b) the frequency, and (c) the amplitude of the motion.

What is the square root of 1023? (Hints: 10 is an integer number. Integer numbers are exact, they don't have any uncertainty. The result however is going to be a real number. Computers approximate real numbers using floating point numbers. Floating point numbers have a given number of significant figures or digits. LON-CAPA typically expects 3, 4 or 5 digits. 2 or 1 is not enough, 6 or more is too many. Very large or very small numbers are expressed in scientific or exponential notation like the number above. Numbers in scientific notation are entered to computer software - like LON- CAPA as 1.23E15 or 1.23e15, for example; and 1.23E-15 or 1.23e-15, if the exponent is negative. If both the number and the exponent are negative, then you type -1.23E- 15 or -1.23e-15. On calculators the button is usually labelled as 'EE', but 'E' or 'EEX' or 'Exp' are also possible.)

where does the 0.75 come from isint it supposed to be 0.5?

how did you go from 1=e^-r/a(1+r/a) to the units just being meters?