Students conducting an analysis of an unknown substance repeatedly missed the mark. To identify the unknown, they calculated the density of their mystery element or compound. To do this, they recorded both the volume and mass of their sample.
All BUT one factor are unavoidable errors that could influence their results. That is
A)
calculator error.
B)
miscalibrated balance
C)
miscalculating the density.
D)
mislabelled samples provided by instructor.

Most energy in an ecosystem comes originally from_

Part f - example: finding two forces (part i) two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. the block in (figure 1) has a mass m=10kg and is being pulled by a force f on a table with coefficient of static friction îľs=0.3. four forces act on it: the applied force f (directed î¸=30â above the horizontal). the force of gravity fg=mg (directly down, where g=9.8m/s2). the normal force n (directly up). the force of static friction fs (directly left, opposing any potential motion). if we want to find the size of the force necessary to just barely overcome static friction (in which case fs=îľsn), we use the condition that the sum of the forces in both directions must be 0. using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: fcosî¸â’îľsn=0 fsinî¸+nâ’mg=0 in order to find the magnitude of force f, we have to solve a system of two equations with both f and the normal force n unknown. use the methods we have learned to find an expression for f in terms of m, g, î¸, and îľs (no n).

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?