Abicycle wheel of radius 14 cm is mounted at the middle of an axle 96 cm long. the tire and rim weigh 23 n. the wheel is spun at 12 rev/s, and the axle is then placed in a horizonal position with one end resting on a pivot

a. what is the magnitude of the angular momentum due to the spinning of the wheel? (treat the wheel as a hoop.)
b. what is the angular speed of precession? rad/s how long does it take for the axle to swing through 360 degree around the pivot?
c. what is the magnitude of the angular momentum associated with the motion of the center of mass, that is, due to the d. precession? in what direction is this angular momentum? up up or down, depending on the direction of in part (a) down

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

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).

Name the non metal condut electricity