ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working on this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated.
Calculate the kinetic energy in joules of a 10 g bullet moving at 300 m/s.

J

A) 900
B) 450
C) 15
D) 45

Arock collection comes from which part of earth?

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).

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e