-20° Problem 50. The 5-oz pinewood-derby car is released from rest at the starting line A and crosses the finish line C 2.75 sec later. The transition at B is small and smooth. Assume that the net retarding force is constant throughout the run and find this force. B 10' 15'

i %AT lI. 团 / مستند بلا عنوان -> Q1/ Replace the force and couple system acting on the member in Fig.by an equivalent resultant force and couple moment acting at point A. 130lb 300lb.ft 1 ft -801b 200Ib II >

4. The 500-kg uniform beam is subjected to the three external loads shown. Compute the reactions at the support point O. The x-y plane is vertical. 15 kN-m 130% × 8 kN A B Lief 1.4 kN 1.8 m 1.8 m 1.2 m +

A small block slides at a speed von a horizontal surface. Knowing that h=04 m, determine the required speed of the block if it is to leave the cylindrical surface BCD when 0 = 35". The required speed of the block to leave the cylindrical surface is m/s

1. The scaffold S is raised by moving the roller at A toward the pin at B. Roller A is approaching B with a constant speed of 1.5 ft/s. The 4-ft links AE and BD are pin connected at their midpoint. Find an equation D 4 ft for the speed at which the platform raises as a function of 0. Graph this equation from 10° to 60°. Graphs need to be in the HW submission to have them scored. Be 1.5 ft/s professional, with the plot being a curve (not points) and axes labeled. Ask for help if you need.

Determine the height h above the base B at which the resultant of the three forces acts. 220 lb 36" 560 Ib 36" 260 lb 36" B Answer: h = i in.

6) Z. A thin non-condu cting rod of ma ss m and length L = 60cm, slides frictionl essly at a constant speed V = 0.5 m/s along the rails placed on the surface and at the edges of an inclined plane with the effect of an external force. The rails at the edges of the inclined plane are connected with each other via the rail at the bottom edge of the plane, so the rod and rails forms a rectangular closed loop as seen in the figure. The plane of the rails makes an angle 0 = 55° with the horizontal plane (xz plane). Before sliding, the rod stays at the di stan ce S = 4m measured from the bottom edge of the inclined plane. The inclined plane and the rod are under the effect of a uniform magnetic field given by B = 0.40î + 3ĵ + 0.8k(T). After the rod starts to slide, what will be the magnetic flux passing through the surface formed by the rod, the rails at the edges, and the rail at the bottom edge of the inclined plane at t=4s? A) 1.50 Wb B) 7.53 Wb C) 0.083 Wb D) 0.147 Wb E) 1.67 Wb

1. Complete the following if g = 9.81 and V = 10 m3 (Show your Solution) (kg' m(kg) W (N) kg \m m³ A 20 C 4. 100 E 100

What is the x-component y X 40° of this force? 10 N A. 10 sin 40° B. 10 cos 40° C. -10 cos 40° D. 10/sin 40°

Mang Juan connected a spring to a wall, mounted horizontally. Juana his daughter pulls the spring to the right stretching the spring by 30 cm. If the pulling force exerted on the spring is 90 N, calculate the spring constant of the spring.