Underneath the appropriate column of graphs from thinkabout 36.2, write an equation that solves for the variable in question (see below). write which model you used: newtonian force model, energy-interaction model, the momentum conservation model, if you introduce any new variables, clearly indicate what they mean. (a) the velocity of a dropped object just before it hits the floor. (b) the time it takes the dropped object in (a) to reach the floor after being dropped. (c) the change in velocity for a spacecraft firing its rockets for a certain length of time. (d) the speed of the race car after the first 10 seconds.

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).

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Which best describes what forms in nuclear fission? a. two smaller, more stable nucleib. two larger, less stable nucleic. one smaller, less stable nucleusd. one larger, more stable nucleus