3A. A 100-N block on a rough 30degrees-incline is acted upon by a force P as shown causing it to accelerate at 2 m/s^2 up the plane. The coefficient of kinetic friction is 0.30. (a) Draw the FBD of the block (b) Find the magnitude of P
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3A. A 100-N block on a rough 30degrees-incline is acted upon by a force P as shown causing it to accelerate at 2 m/s^2 up the plane. The coefficient of kinetic friction is 0.30.
(a) Draw the FBD of the block
(b) Find the magnitude of P


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- 3. Suppose a box enters a region of frictional floors, as seen in Fig. 3. x = 0 1 μ1 H₂ μ3 μ4 H5 μ6 d The box with mass m = 2 kg enters the region with initial speed vo = 10 m/s. Each of the frictional patches has a length of d = (10/19.62) m. The n-th frictional patch has a coefficient of kinetic friction given by un. (a) What is the initial kinetic energy of the box? hope (b) f 0.3 for all , how far goes the bleek travel before stopping? Find the thermal energy of the system at the end of each patch trayersed Do the same if un (d) Do the same if µn = (10/11)". (Does this one ever stop?) m Voi never practiced a problem like this in chapter six and need some help working through it as i’m rusty on the concepts of 6A 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?
- Zoologists have studied the mechanics of locust jumping. When a locust jumps, as depicted in the figure, the resultant force R exerted by the hind legs is the sum of two forces. The first force W acts directly downward to support the locust's weight, which is about 0.02 newton. The second force F is for the takeoff; its magnitude is about 0.29 newton, and the direction makes an angle of 55° with the horizontal. W 55° Find the magnitude of the resultant force R = F + W. (Use decimal notation. Give your answer to three decimal places.) magnitude of resultant force R: newtonThe upper leg muscle (quadriceps) exerts a force of 1220 N , which is carried by a tendon over the kneecap (The patella) at the angle shown in figure 5.43. Find the magnitude and direction of the force exerted by the knee cap on the upper leg bone ( the femur ) . n? degree (counter clockwise from an axis directed to the left ) ?2 sig figs only
- Question 8. A 5.41-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.369. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 2.64 m/s², and (c) accelerating downward with an acceleration whose magnitude is 2.64 m/s².Ans: 19.56 N; 24.83 N; 14.29 NOur 10.0-kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.40 and the coefficient of kinetic friction is 0.30. Determine the force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (a) 0, (b) 10 N, (c) 20 N Use 9.81m/s sqaured for the gravity and also F sub A unit for the applied force1O C A cart for hauling ore out of a gold mine has a mass of 439 kg , including its load. The cart runs along a straight stretch of B Track track that climbs a shallow 4.75° incline. A donkey, which is Rope trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 441 N force for a distance of 185 m by means of a rope that is parallel to the slope but makes an angle of 14.5° with the track. A „Track incline Model the rolling resistance of the cart as though it were Horizontal ground sliding on the track with a coefficient of friction of 0.0163. Use g = 9.81 m/s, and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes %3D with the track. Find the work Wa that the donkey performs on the cart during this process. %3D Find the work W, that the force of gravity performs on the cart during this process. = "M Calculate the work W done on the cart by friction during this process. 87