Find the tension in each cable supporting the 620-N cat burglar. ( Assume the angle 0 of the inclined cable is 38.0 degrees.) a. inclined cable horizontal cable vertical cable b. suppose the horizontal cable was reattached higher up on the wall. would the tension in the inclined cable increase, decrease, or stay the same? increase decrease stays the same

Statics of Rigid Bodies

GOAL Apply the concept of static friction to an object resting on an incline. PROBLEM Suppose a block with a mass of 2.50 kg is resting on a ramp. If the coefficient of static friction between the block and ramp is ng sin e 0.350, what maximum angle can the ramp make with the horizontal mg cos e e before the block starts to slip down? STRATEGY This is an application of Newton's second law involving an object in equilibrium. Choose tilted coordinates, as in the figure. Use the fact that the block is just about to slip when the force of static friction takes its maximum value, f. = 4n. SOLUTION Write Newton's laws for a static system (1) EF = mg sin e - u̟n = 0 in component form. The gravity force (2) EF = n - mg cos e = 0 has two components. Rearrange Equation (2) to get an n = mg cos 8 expression for the normal force n. Substitute the expression for n into EF, = mg sin 8 - H mgcos 0 = 0 → tan 8 =u. Equation (1) and solve for tan 0. Apply the inverse tangent function to get the answer.…

OU President Harroz is hanging an OU banner outside of Boyd house. The banner is hanging from a bar of length L that is supported by a cable attached a distance L/2 above the end of the bar. There are two options, attach the cable to the end of the bar (blue cable) or at a point somewhere nearer the middle of the bar (red cable). Let Fend be the tension if a cable is attached to the end of the bar and Fmid be the tension if a cable is attached closer to the middle of the bar. (There is only one cable at a time.) Let the mass of the sign be 6.07 kg and the mass of the bar be 4.02 kg. Let the red cable be attached a distance 0.60 L from the right end of the bar. What is the ratio of the forces, Fmid/Fend? Give your answer to three significant digits to avoid being counted off due to rounding. As this is a ratio, there are no units. L ලා L/2