Auniform pole is propped between the floor and the ceiling of a room. the height of the room is 7.11 ft, and the coefficient of static friction between the pole an the ceiling is 0.671. the coefficient of static friction between the pole and the floor is greater than that between the pole and the ceiling. for parts () assume the mass of the pole is 3.1 ibm and its length is 7.71 ft. give your answers in pounds of force (lbf). (a) find the weight of the pole. w - + (b) find the normal force on the pole from the ceiling. n = + (c) find the frictional force from the ceiling. y + (d) find the normal force from the floor n = 9 + (e) find the frictional force from the floor f = y + for part (f), assume you can make the pole any way you like, out of any material, with any radius and any length. (f) what is the length of the longest pole that can be propped between the floor and the ceiling (in feet)?

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

The solid that is formed and usually sinks to the bottom of a solution is the

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons