College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A man runs around a circular track of 800 meters radius for 30 seconds, starting at a point directly to the right of the center and goes in a counterclockwise manner. He goes 5 meters per second for the first 15 seconds, runs 90 meters for the next 6 seconds and then 180 meters for the rest of the course. What was his average speed, his displacement from the starting point, his average velocity, and his total displacement upon return to the starting point?arrow_forwardTwo blocks of mass m 10 kg and mg 5 kg are connected by a massless string that passes over a pulley as shown in the figure. The system is in static equilibrium. There is friction between m and the inclined surface (4=0.4). Neglect the friction between the string and the pulley. Determine the static friction force in the system. 10 kg 5.0 kg 37 49 0 N 29.3 N 39.2 N 33.9 N 9.98 Narrow_forwardA point with mass m is a distance d from the end of a bar, which we'll call x = 0. The mass-per-length > of the bar is low at one end and steadily increases toward the other end at x = L like λ = bx. m = 0.9 kg d = 12 cm L = 56 cm b = 2.6 × 1012 kg/m² Find F [N] = L d x=0arrow_forward
- Lizzy is training on the trapeze when a slight accident occurs. As a result, she is now hanging from the middle of a 60 m safety rope connected to the ceiling on one end and held by a strongwoman from the circus on the other end. She has a mass of 50 kg and the part of the rope connected to the ceiling makes an angle of 55° with the vertical. The part of the rope that connects Lizzy to her fellow circus artist makes an angle of 20° above the horizontal (the strongwoman is above Lizzy). As long as Lizzy remains stationary, what is the tension in both parts of the rope?arrow_forwardThe L1 and L2 re the lengths of the rope that supports the masses M1₁ and M2, respectively. The hanging masses are placed at the end of a horizontal bar whose length is R₁ + R₂, as shown. R₁ R₂ L₁ M₁ R1L1= R242 L₁ L2 and R₁ = R₂ L₁ L2 and M₁ = M2 R₂ and M₁ = M2 L₂ The horizontal bar in the figure will remain horizontal if: OR₁ M₂arrow_forwardThe drawing shows two identical systems of objects; each consists of the same three small balls connected by massless rods. In both systems the axis is perpendicular to the page, but it is located at a different place, as shown. The same force of magnitude F is applied to the same ball in each system (see the drawing). The masses of the balls are m1 = 9.0 kg, m2 = 6.1 kg, and m3 = 7.9 kg. The magnitude of the force is F = 441 N. (a) For each of the two systems, determine the moment of inertia about the given axis of rotation. (b) Calculate the torque (magnitude and direction) acting on each system. (c) Both systems start from rest, and the direction of the force moves with the system and always points along the 4.00-m rod. What is the angular velocity of each system after 5.35 s?arrow_forward
- Three ropes are tied to a small metal ring. At the end of each rope three students are pulling, each trying to move the ring in theirdirection. If we look down from above, the forces and directions they are applying are shown in the figure below. Find the netforce on the ring due to the three applied forces.arrow_forwardThe system shown consists of 3 cables. For instance; cable C12 joins points 1 and 2. The coordinates of point 1 are (7.79, 0, 0) m, those of point 2 are (0, 7.58, 9.77) m, and those of point 3 are (0, 7.58, -9.77) m. The force P = 99 kN. Determine the force in cable C14.arrow_forwardA lamp of mass m is hung from from a series of short massless wire segments to a horizontal ceiling and a vertical wall as shown in the figure. The lamp is not moving. T₂ 2 60° T₁ Lamp T3 m 60° The wire segments create angles 60° with respect to the horizontal ceiling and 60° with respect to the vertical wall as shown and the mass creates tensions in the segments of the wire of magnitude T₁, T2, and T3, as labeled in the diagram. (A) Draw a free-body diagram for the hanging mass system showing (and labeling) all forces acting on the hanging lamp system. Then draw x and y axes for your free-body diagram. (B) Use Newton's second law to write equations for forces in component forms (x and y, separately) acting on the lamp in terms of: tension magnitudes T2 and T3, the angles shown, the mass of the object m and the gravitational constant g. You do not need to solve the equations but simplify as possible. (C) The weight of the lamp is determined to be 250 Newtons. Solve for magnitudes of…arrow_forward
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