Review IP Illinois Jones is being pulled from a snake pit with a rope that breaks if the tension in it exceeds 755 N. Part A If Illinois Jones has a mass of 70.0 kg and the snake pit is 3.10 m deep, what is the minimum time that is required to pull our intrepid explorer from the pit? Hνα ΑΣφ Submit Request Answer Part B Explain why the rope breaks if Jones is pulled from the pit in less time than that calculated in part A. Essay answers are limited to about 500 words (3800 characters maximum, including spaces). 3800 Character(s) remaining Submit Request Answer

You want to use a rope to pull a 12-kg box of books up a plane inclined 30° above the horizontal. The coefficient of kinetic friction is 0.28. The rope pulls parallel to the incline. Part A What force do you need to exert on the rope if you want to pull the box at constant speed. Express your answer with the appropriate units.

IP Two blocks, stacked one on top of the other, can move without friction on the horizontal surface shown in the figure.(Figure 1) The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.44. Part A If a horizontal force F is applied to the 5.0-kg bottom block, what is the maximum value F can have before the 2.0-kg top block begins to slip? Express your answer using two significant figures. Πν ΑΣφ. F = N Submit Request Answer Part B If the mass of the top block increased, does the maximum value of F increase, decrease, or stay the same? O increases O decreases O stays the same Submit Request Answer Provide Feedback Figure 2.0 kg F 5.0 kg

Part A Find the magnitude of the force needed to accelerate a 300 g mass with a -0.235 m/s2 i+0.390 m/s2 j. Express your answer to two significant figures and include the appropriate units. ? Value Units F = Request Answer Submit Part B Find the direction of this force Express your answer to two significant figures and include the appropriate units. ? Value Units Request Answer Submit