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- As shown below, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. lf F=10Nand M=1.0kg , what is the tension in the connecting string?(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise, it is possible to exert forces to the joints that are easily 10 times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pam.Check Your Understanding A block of mass 1.0 kg rests on a horizontal surface. The frictional coefficients for the block and surface are s=0.50and k=0.40 . (a) What is the minimum horizontal force required to move the block? (b) What is the block’s acceleration when this force is applied?
- You are climbing on a hill that is inclined at 15degrees with the horizontal and you wish tobuild a rope tow to pull yourself up. Ignoring friction, calculate the tension you needed on therope to give your body that has a mass of 45kg a 1.5 m/s^2 acceleration. What if you are toconsider the friction of 100N, what is the value of the tension and coefficient of friction?A block of weight w is suspended from a rope tied to two other ropes at point O. One rope ishorizontally attached to a wall and the other is fastened to the ceiling. The angle betweenceiling and the rope is 60°. What are the tensions in each of the ropes? Assume the weights ofthe ropes and the knots are negligible. If the weight of the block is 100 N, what is the tension inthe ceiling rope?M Kg Fa? a wis Calculate the Force required to keep a box of mass 28 from sliding down a ramp at angle 61 degrees. The coefficient of static friction is 0.33. Answer to 3 sig figs.
- necinons Deter mine the required weight o block A so that block B will impend upuord, assuming 47N Force ats perperdiular to block A. the weight F the block B is 547 N the coeppicient of triction between block A and the wall, as well as block B and the inclined Hloor is ay and rope. the Floor rs indlined at 470 witha respect to the horizortal plare. whereas 0-25 for the Fixed anom B417N 구나구N 47° 2/2Two boxes (Box A = 9.7 kg and Box B = 5.4 kg) are connected by acord running over a pulley. The coefficient of kinetic friction betweenbox A and the table is 0.18. We ignore the mass of the cord and pulleyand any friction in the pulley, which means we can assume that a forceapplied to one end of the cord will have the same magnitude at theother end. We wish to find the tension of the cord while accelerating (inN), assuming the cord doesn’t stretch. As box B moves down, box Amoves to the right. Hint: Solve for the acceleration of the system first.A 1.5 kg block resting ina rough flat surface is pulled by a string. The string makes an angle of 20 degress with the horizontal. The coefficient of static friction between the blodk and the surface is 0.35. What is the maximum tension in the string to keep the block unmoved?
- (a) Calculate the tension (in N) in a vertical strand of spiderweb if a spider of mass 6.00 x 10-5 kg hangs motionless on it. (Enter a number.) 0.000588 N (b) Calculate the tension (in N) in a horizontal strand of spiderweb if the same spider sits motionless in the middle of it much like the tightrope walker in the figure. 5.0⁰ TR T. Ta W 5.0° i The strand sags at an angle of 12.0° below the horizontal. (Enter a number.) 0.000588 N Compare this with the tension in the vertical strand (find their ratio). (Enter a number.) (tension in horizontal strand)/(tension in vertical strand) = 4.80823. Two identical boxes are being pulled across a horizontal fl oor at aconstant velocity by a horizontal pulling force of 176 N that is applied toone of the boxes, as the drawing shows. There is kinetic friction betweeneach box and the fl oor. Find the tension in the rope between the boxes.The glue on a piece of tape can exert forces. Can theseforces be a type of simple friction? Explain, consideringespecially that tape can stick to vertical walls and even toceilings.