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- A prototype jet-powered UAV has a wing planform with S = 60 ft2 and b = 20 ft. and an Oswald efficiency of e = 0.82. The aircraft has CD,0= 0.04. The weight is 2,000 lb. For this aircraft, determine the following: a. Minimum thrust required at sea level for steady level flight. b. Velocity of minimum thrust required for the conditions in (a). c. The induced drag for the conditions in (a). d. If Vmax at sea level is 550 fps, what is the thrust available in lb? e. Given the thrust available is produced by a single turbojet engine with a cross-sectional inlet area of Ain= 2.5 ft2, determine the exit velocity from the engine and the propulsion efficiency assuming the exit pressure is atmospheric..Consider the system shown below. The incline plane is fixed and the coefficient kinetic friction between M and 2M is ?1, and coefficient kinetic friction between the plane and 2M is ?2. Let M=2.0kg, ?=22o, ?1=0.14, and ?2=0.25. (a) What is the magnitude of the frictional force on mass M? (b) What is the magnitude of the total frictional force on mass 2M? (c) What is the acceleration of mass M? (d) What is the acceleration of mass 2M?Assume that there are no frictional forces between the pulleys and the strings, and the strings are mass-less. The frictional coefficient between the1 kg and 2 kg is 0.05, the frictional coefficient between the 2 kg and 5 kg is 0.1, and the frictional coefficient between the 5 kg and the table is 0.2. (a) Draw free-body diagrams for each mass? (b) Calculate the magnitudes of normal forces and frictional forces?(c) If we release 4 kg and 3 kg from rest what are the accelerations of each mass? (System has two different accelerations)(d) Calculate the tensions in each string?
- A pile-driver hammer has a mass of 300 kg and is to be raised 16 m in 4 sec. The total friction on the guides is constant at 400 N. What constant pull must be exerted on the cable?In a modified version of the cart and bucket, the angle of the slope is alpha = 34.9∘ and the bucket weighs 295 N. The cart moves up the incline and the bucket moves downward, both at constant speed. The cable has negligible mass, and there is no friction. What is the weight of the cart?What is the tension in the cable?Two blocks having the weights and positions shown in Fig. P-1243 rest upona frame which rotates about its vertical axis at a constant speed. Thecoefficient of friction between the blocks and the frame is 0.20. The weightand friction of the pulley being neglected, at what speed in rpm will theblocks start to slide2 What is the tension in the cord at this instant?
- given the figure below determine the velovity in (fps) of block A as it hits the surface BA block is being pushed on a flat surface of magnitude 45N. The force of friction on the brick is 13 N. that mass of the block is 11kg. A draw a free body diagram B what is the net force acting on the block C what is the acceleration of the block?An electric motor M is used to reel in cable and hoist a bicycle into the ceiling space of a garage. Pulleys are fastened to the bicycle frame with hooks at locations A and B, and the motor can reel in cable at a steady rate of 20 in./sec. At this rate, how long will it take to hoist the bicycle 7.9 feet into the air? Assume that the bicycle remains level.
- 2 Angle of friction is the a. Angle between normal reaction and the resultant of normal reaction and the limiting friction b. Ratio of limiting friction and normal reaction c. The ratio of minimum friction force to friction force acting when the body is in motion d. The ratio of minimum friction force to the friction force acting when the body is just about to moveTo climb a 400 meter high mountain, you have two options, a straight line route with a 40 ° slope or a route composed of 5 equal sections (same length) each with a 20 ° slope. If traveling in a car with a mass of 1280 kg and a maximum power of 88 kW, Determine (assume the whole car as a particle): a) Is the friction enough to prevent the car from sliding? The coefficient of static friction of the tires with the ground is 0.95. b) What is the power required to climb the 40 ° slope at a constant speed of 40 km / h? Does the car have enough power to go up at that speed? c) What is the constant speed at which the 40 ° slope can be climbed with a 60 kW power? d) What is the power required to climb a 20 ° slope at 40 km/h? Does the car has enough power to go up at that speed? e) In which of the two trajectories does the car do more work? Ignore the resistance of the air and rolling resistance and radius of curves between sections of the compound route. Please add the free body diagram.Blocks A, B, and C are placed as in Fig. and connected by ropes of negligible mass. Both A and B weigh 25.0 N each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block C descends with constant velocity. (a) Draw separate free-body diagrams showing the forces acting on A and on B. (b) Find the tension in the rope connecting blocks A and B. (c) What is the weight of block C? (d) If the rope connecting A and B were cut, what would be the acceleration of C?