4-5. Rollers A and B each weigh 200 N (Figure P4-5). Assume smooth surfaces and draw a free-body diagram of roller A. FIGURE P4-5 45% bo 70°
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- A rope is strung between two walls parallel to the floor. A 35kg mass is hung from the rope at its midpoint. This causes the rope to sag by 12°. Find the tension in the rope.Problem-solving questions At the back of the leg, two muscles pull on the Achilles tendon to create an upward force. Estimate the nett force if cach muscle has a diameter of about 5.0 mm and exerts a force in a direction of 25° from the vertical. (Use a force per unit area of muscle of 7x10° N/m²). An 18 kg penguin slides down an iceberg at an angle of 15° to the horizontal. Friction between the penguin's body and the ice surface is negligible. Determine the normal force acting on the penguin and its acceleration down the iceberg. A manufacturer of children's slides does some tests and discovers that the slope of a slippery slide must be at least 25° to the horizontal for the slide to work. The child involved in doing the testing weighs 35 kg. What is the coefficient of static friction between the child and the slide? A car drives onto a section of the road which is covered in ice. The driver attempts to stop by hitting the brakes but the wheels lock and the car skids for another 60 m.…A homogeneous pulley with two grooves consists of two wheels which turn together as one around the same axis. The moment of inertia of the two wheels together is ICM = 40 kg m2. The radii are: R1 = 1.2 m and R2 = 0.4 m. The masses that hang on both sides of the pulley are m1 = 36 kg and m2 = 12 kg. We will assume that the masses of the ropes are negligible. Determine the angular acceleration of the pulley, acceleration of the masses, and the tensions of the ropes.
- A rope attached to a 500-lb block passes over a fric- tionless pulley and is wrapped for one full turn around a If the coefficient of frie- tion between the rope and the post is 0.25. determine fixed post as shown in Fig. The minimum force P that must be used to begin to raise the block. P WBody U with mass 5m is stacked on the top body W with mass m, and released. The bodies are in contact along the frictionless interface at 45° to the vertical. The body U is in contact with the frictionless vertical wall. Body W lies on the floor with coefficient of friction u. Relevant dimensions are shown in the figure. Express the results in terms of given quantities: m, g, h and µ (except when µ is given numerically). You need not evaluate sin 45° = cos 45° = 2/2. h U: 5m C 45 D W: m 3hPHYS-2425.001 He MENA Sign Out Heto Course Home Kassignments Problem 8.31 13 of 19 Aski starts from rest and slides down a 24" incline 10 m long Constanta Periodic Table • Part A If the coefficient of friction is 0075, what is the ski's spand at the base of the incline? Express your answor using two significant figures, 4. m/s Submit Ressst Alis - Part B If e snow is level at the foot of the incine and has the same coeficiend of friction hw Far wil the shi trauel alng theal?e methu Express your answer using two signilicant figures. AE4 d- Sutmn Request Answnt Provide Feetack ENC 1130 PM wysic.com/myctitem ORMC E 1150 e to search
- L GAS A 48.0 kg sign hangs at the end of a bar where L = 3.10 meters in length. A cable attaches to the end of the horizontal bar and to a wall 2.60 meters above where the bar is attached to the wall. The bar has a mass of 12-kg. What is the tension in the cable? Give your answer in Newtons to 3 significant figures (no decimal places in this case).A system comprised blocks, a light frictionless pulley, and connecting ropes is shown in the figure. The B block has a mass of 9.3 kg and is on a perfectly smooth horizontal table. The surfaces of the A block, which has a mass of 8.2 kg, are rough, with uk = 0.25 between the block and the table. If the C block with mass 9.9 kg accelerates downward when it is released, find its acceleration. A В C.5) A 520 g squirrel with a surface area of 945 cm2 falls from a 6.0-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the squirrel can be approximated as a rectanglar prism with cross-sectional area of width 11.6 cm and length 23.2 cm. Note, the squirrel may not reach terminal velocity by the time it hits the ground. Give the squirrel's terminal velocity, not it's velocity as it hits the ground.) _____ m/s What will be the velocity of a 52.0 kg person hitting the ground, assuming no drag contribution in such a short distance? _____m/s
- The 150-lb man lies against the cushion for which the coefficient of static friction is u, = 0.5. He rotates about the z axis with a constant speed v = 32 ft/s. (Figure 1) Figure 1 of 1 ft5-61. If d = 1 m, and 0 = 30°, determine the normal reaction at the smooth supports and the required distance a for the placement of the roller if P 600 N. Neglect the weight of the bar. =Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 0 = 45° and P = 900 N. W = 700 N Ꮎ μs = 0.40 Mk = 0.30 P