1. [-/5 Points] DETAILS KATZPSEF1 5.P.041. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two blocks are connected by a rope that passes over a massless and frictionless pulley as shown in the figure below. Given that m, = 18.73 kg and my = 11.11 kg, determine the magnitudes of the tension in the rope and the blocks' acceleration. T = N m/s2 (Enter the magnitude.) m12. [-/5 Points] DETAILS KATZPSEF1 5.P.047. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A block with mass m, hangs from a rope that is extended over an ideal pulley and attached to a second block with mass my that sits on a ledge. The second block is also connected to a third block with mass m3 by a second rope that hangs over a second ideal pulley as shown in the figure below. If the friction between the ledge and the second block is negligible, m, = 2.20 kg, m2 = 5.40 kg, and m3 = 8.20 kg, find the magnitude of the tension in each rope and the acceleration of each block. (Enter the magnitude.) a = m/s2 T12 = N T23 = N m 2 m1 m33. [-/5 Points] DETAILS KATZPSEF1 5.P.050. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A block with mass mj hangs from a rope that is extended over an ideal pulley and attached to a second block with mass my that sits on a ledge slanted at an angle of 200 (see figure below). Suppose the system of blocks is initially held motionless and, when released, begins to accelerate. m2 m1 20 (a) If m, = 5.25 kg, my = 3.25 kg, and the magnitude of the acceleration of the blocks is 0.140 m/s2, find the magnitude of the kinetic frictional force between the second block and the ledge. N (b) What is the value of the coefficient of kinetic friction between the block and the ledge?4. [-/5 Points] DETAILS KATZPSEF1 5.P.077. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A heavy chandelier with mass 190 kg is hung by chains in equilibrium from the ceiling of a concert hall as shown in the figure below, with 8, = 34.0 and 02 = 68.00. Assuming the chains are massless, what are the tensions FT1, F72, and F73 in the three chains? Fn F12 FT1 = FT2 = ZZ Z F73 =5. [-5 Points] KATZPSEF1 6.P.015. ASK YOUR TEACHER A box is at rest with respect to the surface of a flatbed truck. The coefficient of static friction between the box and the surface is #5. (a) Find an expression for the maximum acceleration of the truck so that the box remains at rest with respect to the truck. Your expression should be in terms of its and g. Ial = (b) How does your answer change if the mass of the box is doubled? O The maximum acceleration doubles. O The maximum acceleration is halvedi O The maximum acceleration quadruples. O The maximum acceleration is independent of the mass of the box. Need Help? _ 6. [-/5 Points] DETAILS KATZPSEF1 6.P.050. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Escaping from a tomb raid gone wrong, Lara Croft (m = 66.0 kg) swings across an alligator-infested river from an 8.85-m-long vine. If her speed at the bottom of the swing is 6.30 m/s and she makes it safely across the river, what is the minimum breaking strength of the vine? N Need Help? Read It Submit Answer 7. [-/5 Points] DETAILS KATZPSEF1 6.P.059. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Banked curves are designed so that the radial component of the normal force on the car rounding the curve provides the centripetal force required to execute uniform circular motion and safely negotiate the curve. A car rounds a banked curve with banking angle 0 = 24.50 and radius of curvature 157 m. (a) If the coefficient of static friction between the car's tires and the road is us = 0.382, what is the range of speeds for which the car can safely negotiate the turn without slipping? Vlow = m/s Vhigh = m/s (b) What is the minimum value of us for which the car's minimum safe speed is zero? Note that friction points up the incline here. Need Help? Read It8. [-/5 Points] DETAILS KATZPSEF1 6.P.068. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Instead of moving back and forth, a conical pendulum moves in a circle at constant speed as its string traces out a cone (see figure below). One such pendulum is constructed with a string of length _ = 12.9 cm and bob of mass 0.288 kg. The string makes an angle 0 = 8.140 with the vertical. L m Bob (a) What is the radial acceleration of the bob? magnitude m/s2 direction ---Select--- v (b) What are the horizontal and vertical components of the tension force exerted by the string on the bob? (Assume radially inward to be the positive x axis and vertically upward to be the positive y axis. Express your answer in vector form.) T = Need Help? Read It9. [-15 Points] KATZPSEF1 6.P.080.M|. ASK YOUR TEACHER PRACTiCE ANOTHER A particle of dust lands 42.0 mm from the center of a compact disc (CD) that is 120 mm in diameter The CD speeds up from rest, and the dust particle is ejected when the CD is rotating at 80.0 revolutions per minute. What is the coefficient of static friction between the partitie and the sur'fate of the CD? :i New Help? _'_' Submit Answer 10. [DIS Points] PREVIOUS ANSWERS KATZPSEF1 8.P.061. ASK YOUR TEACHER PRACTiCE ANOTHER A stellar black hole may form when a massive star dies. The mass of the star collapses dawn to a single point. Imagine an astronaut orbiting a black hole having six times the mass of the Sun. Assume the orbit is circular. (a) Find the speed of the astronaut if his orbital radius is r = 1 AU. 731400000 X Your response differs signicantly from the correct answer. Rework your solution from the beginning and check each step carefully. mfs (b) Find his speed if his orbital radius is r : 8.9 km. 859325342910" n'n's (c) CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronaut's orbital speed be if his orbital radius were smaller than 8.9 km? This answer has not been graded yet Need Help? _