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A pet mouse sleeps near the eastern edge of a stationary, horizontal turntable that is supported by a friction-less, vertical axle through its center. The mouse wakes up and starts to walk north on the turntable, (i) As it takes its first steps, what is the direction of the mouse's displacement relative to the stationary ground below? (a) north (b) south (c) no displacement, (ii) In this process, the spot on the turntable where the mouse had been snoozing undergoes a displacement in what direction relative to the ground below? (a) north (b) south (c) no displacement. Answer yes or no for the following questions, (iii) In this process, is the mechanical energy of I lie mouse-i mutable system constant? (iv) Is the momentum of the system constant? (v) Is the
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Chapter 11 Solutions
Physics for Scientists and Engineers, Technology Update, Hybrid Edition (with Enhanced WebAssign Multi-Term LOE Printed Access Card for Physics)
- A person pushing a horizontal, uniformly loaded, 27.15 kg27.15 kg wheelbarrow of length ?L is attempting to get it over a step of height ℎ=0.370?,h=0.370R, where ?R is the wheel's radius. The center of gravity of the wheelbarrow is in the center of the wheelbarrow. What is the horizontal component ??Px of the minimum force ?⃗ P→ necessary to push the wheelbarrow over the step? The gravitational acceleration is ?=9.81 m/s2.arrow_forwardThe coefficient of static friction between a certain hoop and a horizontal floor is 0.40. If the rotational inertia of the hoop about its symmetry axis is given by I = MR2, then the magnitude of the maximum acceleration in m/s2 the hoop can have without sliding is:arrow_forwardThe figure shows particles 1 and 2, each of mass m, attached to the ends of a rigid massless rod of length L1 + L2, with L1 = 1.0 m and L2 = 5.0 m. The rod is held horizontally on the fulcrum and then released. What are the magnitudes of the initial accelerations of particle 2?arrow_forward
- If the pole makes an angle of 25° with the horizontal, the distance between the point where the line is attached to the pole and the anglers hand is L = 2.45 m, and the fish pulls on the line such that the tension in the line is T = 166 N at an angle 35.0° below the horizontal, determine the magnitude (in N · m) of the torque exerted by the fish about an axis perpendicular to the page and passing through the angler's hand.arrow_forwardAt the presentation ceremony, a championship bowler is presented a 1.60-kg trophy which he holds at arm's length, a distance of 0.655 mfrom his shoulder joint. A. Determine the torque (in N · m) the trophy exerts about the shoulder joint when his arm is horizontal. (Enter the magnitude only.) ______ N x m B. Determine the torque (in N · m) the trophy exerts about the shoulder joint when his arm is at an angle of 39.0° below the horizontal. (Enter the magnitude only.) ______ N x m Answer both pleasearrow_forwardA man stands on a merry-go-round that is rotating at 2.13 rad/s. If the coefficient of static friction between the man's shoes and the merry-go-round is ?s = 0.63, how far from the axis of rotation can he stand without sliding? (Enter the maximum distance in meters.) marrow_forward
- Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is not true concerning this object? (a) If the angular speed is constant, the object must have constant tangential speed. (b) If the angular speed is constant, the object is not accelerated. (c) The object has a tangential acceleration only if the disk has an angular acceleration. (d) If the disk has an angular acceleration, the object has both a centripetal acceleration and a tangential acceleration. (e) The object always has a centripetal acceleration except when the angular speed is zero.arrow_forwardA man stands on a merry-go-round that is rotating at 2.5 rad/s. If the coefficient of static friction between the man’s shoes and the merry-go-round is s=0.5 , how far from the axis of rotation can he stand without sliding?arrow_forwardIn the assembly below the system can rotate around the vertical axis. The left part is a square where R = 0.1 meters, and the mass of each of the four thin bars is uniform and is 0.1 kg. On the left is a massive sphere of radius R = 0.2 meters and Mass M = 0.3 kg. Assume that the system rotates with constant period T = 2.0 s, when, without any external action, as three leftmost bars detach from the system, leaving only the right vertical bar (on the axis) and sphere . What will be the new period of system revolution? Note: Note that in this case there is no difference between angular velocity and frequency.arrow_forward
- A block of mass m1 = 1.50 kg and a block of mass m2 = 6.25 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.250 m and mass M = 10.0 kg. The fixed, wedge-shaped ramp makes an angle of ? = 30.0° as shown in the figure. The coefficient of kinetic friction is 0.360 for both blocks. (b) Determine the acceleration of the two blocks. (Enter the magnitude of the acceleration.)arrow_forwardA man ties one end of a strong rope 8.00m long to the bumper of his truck, 0.500m from the ground, and the other end to a vertical truck at height of 3.00 m. He uses the truck to create a tension of 8.00 x 102 N in the rope. Compute the magnitude of the torque on the tree due to the tension in the rope, with the base of the tree acting as the reference point.arrow_forwardAt the local playground, a 21-kg child sits on the right end ofa horizontal teeter-totter, 1.8 m from the pivot point. On the leftside of the pivot an adult pushes straight down on the teeter-totterwith a force of 151 N. In which direction (clockwise or counterclockwise) does the teeter-totter rotate if the adult applies the forceat a distance of (a) 3.0 m, (b) 2.5 m, or (c) 2.0 m from the pivot?arrow_forward
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