A 75 kg skier grips a moving rope that is powered by an engine and is pulled at constant speed to the top of a 21 hit. The skier is pulled a distance z 230 m along the incline and it takes 2.1 min to reach the top of the hill. Part A If the coefficient of kinetic friction between the snow and skis is 0.10, what horsepower engine is required i 30 such (max) are on the rope at one time? Express your answer using two significant figures. ΨΗ ΑΣΦΗ P- 22.75 Submit Previous Answers Bequest Answer ? X Incorrect; Try Again; 2 attempts remaining Beview Consta bp

A 75 kg skier grips a moving rope that is powered by an engine and is pulled at constant speed to the top of a 21 hit. The skier is pulled a distance z 230 m along the incline and it takes 2.1 min to reach the top of the hill. Part A If the coefficient of kinetic friction between the snow and skis is 0.10, what horsepower engine is required i 30 such (max) are on the rope at one time? Express your answer using two significant figures. ΨΗ ΑΣΦΗ P- 22.75 Submit Previous Answers Bequest Answer ? X Incorrect; Try Again; 2 attempts remaining Beview Consta bp

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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3. Two blocks, masses m₁ and m2, on a horizontal, frictionless surface are being pulled by a massless, unstretchable rope that goes over a frictionless pulley and is connected to a block of mass m3. Assumer two blocks move together. The coefficient of friction between block 1 and block 2 is . Find the force that block 2 exerts on block 1. 2 [ Free Body Diagrams and Law or Definitio. 3
The block has a mass of 140 kg and rests on a surface for which the coefficients of static and kinetic friction are Hs = 0.5 and uj. = 0.4, respectively. (Figure 1) Part A If a force F = (60t2 ) N, where t is in seconds, is applied to the cable, determine the power developed by the force when t = 5 s. Hint: First determine the time needed for the force to cause motion. Express your answer to three significant figures and include the appropriate units. µA ? P = Value Units Figure 1 of 1 Submit Request Answer Provide Feedback Next >
(a) It is easier for a person to push an empty shopping cart than a full one where both carts are originally at rest. From this statement, choose and explain law of Newton suitable for these cases. Assume that the coefficients of static friction are the same for both carts. [Adalah lebih mudah untuk menolak bekas beli belah kosong daripada yang pemuh yang mana kedua duanya berada dalam keadaan pegun. Daripada kenyataan ini, pilih dan jelaskan hukum Newton yang sesuai untuk kes ini.) (b) A couple moment, M and forces acting at point O as shown in Figure 1, could be located to point O' to obtain similar effect of translation and rotation with certain approach. Point O and O' having same height from base AB. Using appropriate sketch, explain and justify the above statement. [Momen pasangan M dan daya-daya yang bertindak pada titik o seperti yang ditunjukkan dalam Gambarajah 1, boleh diubah ke titik lain O' bagi menghasilkan kesan pemindahan dan putaran yang sama dengan menggunakan…
A towing machine can deliver horizontal towing force T by a strong, inclastic cable. The towing force T can vary as shown in the graph. A 490 kg timber, initially at rest, is attached to the towing machine. The static friction coefficient between the timber and the surface is Hk = 0.49, and the towing machine must overcome the minimum force needed to move the timber against the static friction. If the kinetic friction coefficient between the timber and the surface is µg = 0.39, determine the velocity of the timber at t= 6.5 seconds. M T (N) 2000 T=125 (s)
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A 75 lb horizontal force is exerted on a 150 lb rested chair. The coefficient of static friction between the chair and the floor is 0.55. Determine the static frictional force action on the chair. A horizontal force is exerted on a 150 lb rested chair. the coefficient of static friction between the chair and the floor is 0.55. Determine the maximum horizontal force that can be applied to the chair before it moves.
1 Problem During a particularly snowy winter in Charlotte, a child of mass m slides down a ramp starting at rest from point A and encounters the melted grassy area at B before coming to a full stop at C. Assume the ice is frictionless. The height of point A is hĄ and the distance between B and C is L. What is the coefficient of friction of the grass, k? Assume that g = 9.81 m/s², ha = 5 m, m = 20 kg, and L = 10 m. hA P JA Ice B Grass L C
3. A vehicle, mass 1400 kg, passes a bend at a speed of 54 km/hr. The radius of curvature of the road is 60 m. Determine the minimum coefficient of static friction between the car tires and the road, so that the car can pass through corners safely.
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Question A 4.0 kg mass, ml, hangs from a rope that runs over a massless frictionless pulley and is connected to a 6.0 kg mass, m2, resting on the surface at an incline of 0 = 35 as shown in Figure (1). The coefficient of static friction between the incline and m2 is 0.09, and the coefficient of kinetic friction is 0.07. Initially, the system is at rest. Calculate (a)the acceleration of the masses (b) the tension in the string. pulley m- Fig. 1
A 25-kg block is initially at rest on a horizontal surface, and a horizontal force of 75.0 N is required to set the block in motion after which a horizontal force of 60.0 N is required to keep the block moving with constant speed. Find (a) the coefficient of static friction and (b) the coefficient of kinetic friction between the block and the surface.
4) This Atwood's machine includes two blocks connected by a cable, going over a pulley without slipping. Block 1 (30.0 kg) is connected to a spring (70.0 N/m), and slides on a horizontal surface with a coefficient of kinetic friction of 0.0100. Block 2 is 50.0 kg, and hangs vertically from the cable. The pulley is a disk with a radius of 0.500 m, and its moment of inertia about the center of mass is 10. 0 kg-m“. a) Draw the three free body diagrams, and write out Newton's 2nd Law for each. b) Derive the equation of motion (inhomogeneous 2nd order ODE) for this system. c) Use u-substitution to rewrite this as a homogeneous 2nd order ODE. d) Assume the position x as a function of time t is of the form x(t) = A cos (wt + p) I disk for undamped natural frequency w, phase angle P, and amplitude A. The initial conditions are: x(0) v(0) = -3. 00 m/s. Solve for the position of the mass as a function of time (you need to solve for w, 4, and A). = 2. 00 m and Mz