Asample of an unknown volatile liquid was injected into a dumas flask (mflask = 27.0928 g, vflask = 0.1040 l) and heated until no visible traces of the liquid could be found. the flask and its contents were then rapidly cooled and reweighed (mflask+vapor = 27.4593 g). the atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °c, respectively. the unknown volatile liquid was

Tungsten-filament lightbulb emits light based on the temperature of the filament. which phenomenon does this demonstrate?

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).

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong