P2 D 2 m B Given P1 and P2, find all the internal forces. · • P₁ • P2 = 1200 N = 4000 N 1.5 m
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2 m
B
Given P1 and P2, find all the internal
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• P₁
•
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=
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= 4000 N
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- A 45.9-kg box is being pushed a distance of 6.54 m across the floor by a force P whose magnitude is 168 N. The force P is parallel to the displacement of the box. The coefficient of kinetic friction is 0.208. Determine the work done on the box by (a) the applied force, (b) the friction force, (c) the normal force, and (d) by the force of gravity. Be sure to include the proper plus or minus sign for the work done by each force.A particle moves in the xy plane from the origin to a point having coordinates x=7 m and y=4 m under the influence of a force given by F= -2y^2i -2xj.Mechanical energy is conserved when a system is Select all that apply. isolated in equilibrium O an inertial reference frame O nondissipative O Mechanical energy is never conserved
- Replace the three forces which act on the bent bar by a force-couple system at the support point A. Then determine the x-intercept of the line of action of the stand-alone resultant force R. The couple is positive if counterclockwise, negative if clockwise. y 2350 lb 4.9' 1070 Ib •A B. 31° •D E 2.4' 790 Ib 4.5' Answers: Force-couple system at A R= ( i i+ i j) Ib MA = i Ib-ft Stand-alone resultant X = i ftI Review | Constants A factory worker pushes a 30.0 kg crate a distance of 3.3 m along a level floor at constant velocity by pushing downward at an angle of 30° below the V ΑΣΦ horizontal. The coefficient of kinetic friction between the crate and floor is 0.25. W; = J Submit Request Answer Part D How much work is done by the normal force? Express your answer in joules. ν ΑΣΦ Wnf = Submit Request Answer Part E How much work is done by gravity? Express your answer in joules. ? W9 = 9.8 J Submit Previous Answers Request Answer X Incorrect; Try Again Your answer is the acceleration due to gravity. You need to find the work done by the force of gravity. Part F What is the total work done on the crate? Express your answer in joules. ΑΣΦ ? Wnet = J Submit Request Answer JIA particle moves in a xy plane from the origin to a point having coordinates x=7 m and y=4 m under the influence of a force given by F=-5y^2i -4xj.
- 1) In the formula given for the calculation of work, the variable F represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force isapplied E) The direction of the force acting on the system F) The angular difference between the vectors F and d G) The diameter of the system H) The weight, or force due to gravity, on the system I) The work done by the force F 2) In the formula given for the calculation of work, the variable d represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force…Two balls are connected by a spring: m1 , X 1 k, l m2 , X2 Calculate the force (positive, in Newtons) on ball 1 (subscripts 1) with these numbers: • X1 = 0.3 m • X2 = 3.6 m • e = 0.9 m • k = 6700 N/m %3D19:51 Sat 14 May * 77% T 25. Three stones are thrown with identical initial speeds from the top of a cliff into the water below (see diagram). Air resistance is negligible. The vertical speeds with which stones 1, 2, and 3 strikes the water are . Note: you may assume the angle of elevation and the angle of depression for 1 and 3 are identical a) b) V, >v, = Vs c) d) V >V, >V, e) V = V, = V3 f) none of the above 26. A mote of m
- •40 The potential energy of a diatomic molecule (a two-atom system like H2 or O2) is given by В A U = 712 where r is the separation of the two atoms of the molecule and A and B are positive constants. This potential energy is associated with the force that binds the two atoms together. (a) Find the equilib- rium separation–that is, the distance between the atoms at which the force on each atom is zero. Is the force repulsive (the atoms are pushed apart) or attractive (they are pulled together) if their separa- tion is (b) smaller and (c) larger than the equilibrium separation?A 51-kg box is being pushed a distance of 7.0 m across the floor by a force P→ whose magnitude is 185 N. The force P→ is parallel to the displacement of the box. The coefficient of kinetic friction is 0.21. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by each force.Please show tip to tale method steps 4-34.Determine the load in members AC and BC in Figure P4–34. A 9 m 12 m C В 61.2 kg FIGURE P4-34