4. estimate the time necessary for the spread of the south atlantic ocean between africa and south america by dividing the present separation along the trace of the red dashed line on figure 11.2 by the rate of spreading as calculated in question 2. ritter, scott. interpreting earth history: a manual in historical geology (p. 159). waveland press, inc.. kindle edition.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume