A 10.0-kg monkey climbs a uniform ladder with weight w 5 1.20 3 102 N and length L 5 3.00 m as shown in Figure P8.88 (page 276). The ladder rests against the wall at an angle of u 5 60.0. The upper and lower ends of the ladder rest on frictionless surfaces, with the lower end fastened to the wall by a horizontal rope that is frayed and that can support a maximum tension of only 80.0 N. (a) Draw a force diagram for the ladder. (b) Find the normal force exerted by the bottom of the ladder. (c) Find the tension in the rope when the monkey is twothirds of the way up the ladder. (d) Find the maximum distance d that the monkey can climb up the ladder before the rope breaks. (e) If the horizontal surface were rough and the rope were removed, how would your analysis of the problem be changed and what other information would you need to answer parts (c) and (d)?
Week 2 Monday, August 29, 2016 12:03 AM • Charging by rubbing- if you rub glass rod with silk, e- transfer from rod to silk leaves equal + charge on rod..only rubbed area is charged • Polarization: ○ In neutral atoms:center of + charge coincides w/ center of - charge ○ Charged atoms:centers separate from electric force Causes electric dipole(polarization) ○ Ex) neutral wall w + balloon…+ charged balloon will induce - charge on insulator(wall) • Coulomb's law- electric force has following properties: ○ Directed along line joining 2 charged particles ○ Inversely proportional to square of separation distance (r) btwn them Proportionalto product of mags of ch
