P13 001
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This document discusses the torques exerted by 8 people on opposite sides of a seesaw. It calculates that the largest torque out of the page is 990 N·m, due to person 2 weighing 330 N and being 3 m from the fulcrum. The largest torque into the page is also 990 N·m, due to person 7 also weighing 330 N and being 3 m from the fulcrum.
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GMm/R^3 describes simple harmonic motion for an object in a gravity tunnel between the Earth's surfaces, with a period of 2π(R^3/GM).
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P13 025
The document summarizes calculations to determine forces in a cable-strut system. It defines key angles between components as 15 and 45 degrees. It uses the torque equation about the hinge to find the torque T as 6.63x103 N by canceling the unknown boom length. Horizontal force Fx is then calculated as 5.74x103 N using T and the 30 degree cable angle. Vertical force Fy is calculated as 5.96x103 N using torque T, weights and gravity.
Functions
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P13 053
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A ball is thrown vertically upwards with an initial velocity of 29.4 m/s. It reaches its maximum height of 44.1 m after 3 seconds. After 4 seconds, the ball has fallen 4.9 m from its maximum height and is located 39.2 m above the ground, having traveled a total distance of 4.9 m during its downward motion in the 1 second since reaching maximum height.
P13 043
The document calculates the strain, stress, and Young's modulus of a rope used for rock climbing. It determines that the strain is 1.9 × 10−3 based on the rope's stretched length. The stress is calculated to be 1.3 × 107 N/m2 by relating the force of a 95 kg climber to the rope's cross-sectional area. Finally, it divides the stress by the strain to determine the rope's Young's modulus is 6.9 × 109 N/m2.
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P13 058
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P13 057
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P13 056
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P13 059
A balance has arms of length 1 and 2, and masses m1 and m2. The equations for torque equilibrium when the balance is balanced are m1*1=m2*2 and m1=m2*2. Dividing the equations and solving for the unknown mass gives the result that m = √(m1*m2).
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The document analyzes the forces at a knot holding a 5 kg mass at a 30 degree angle. It represents the static friction force and weight of the 5 kg mass as the sides of a right triangle. It finds that the static friction force equals the weight of the 5 kg mass multiplied by the tangent of 30 degrees. For the static friction force to be at its maximum, it must equal the coefficient of static friction multiplied by the weight of the 10 kg object. Equating these expressions allows one to calculate that the coefficient of static friction equals 0.29.
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P13 052
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P13 050
The document describes calculating the forces acting on a beam attached to a hinge by a cable and balanced force. It finds that the cable exerts 88N of tension to balance the 50N force on the beam and no net torque. It then calculates the x and y components of the hinge force as 30N rightward and 97N upward to balance all the forces acting on the beam.
P13 048
This document describes calculating torques and forces on a beam hinged at one end. It finds that for a 12m beam with a 400N tension and angles of 40 and 50 degrees, the weight on the beam is 671N. Equilibrium equations show the horizontal hinge force is 400N of tension and the vertical force is approximately 670N of weight.
P13 047
1) The document describes calculating the torque on a ladder leaning against a wall and finding the horizontal force needed to keep it from sliding.
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P13 046
This document describes the tensions in two strings (T and T') that are supporting a weight (W). It provides the force equilibrium equations relating the horizontal and vertical forces of T, T', and W. Solving these simultaneous equations yields that T = 15 N and T' = 29 N.
P13 045
The force exerted on the beam is 7900 N. To find the required cross-sectional area, the formula F/A = Su/6 is used, giving an area of 9.5 x 10-4 m2. Taking the square root of this area gives the thickness of 0.031 m.
P13 044
A steel cable supporting a 670 kg load experiences an elastic stretch proportional to its free length. For a cable length of 12m, the calculated stretch is 0.0008m. For a longer cable length of 350m, the calculated stretch increases to 0.023m due to the cable's increased free length.
P13 042
The document summarizes the calculation of:
1) The volume of sand contained within a cylinder and cone of given dimensions is 6.78 cubic meters.
2) The weight of the sand is calculated to be 1.20 × 105 Newtons based on the volume and density.
3) An equation for stress as a function of radius is derived, with stress proportional to 13r + 40000 pascals.
4) The force on the cylinder is integrated and calculated to be 1.04 × 105 Newtons.
5) The fractional reduction in calculated force compared to measured weight is 13%.
P13 041
The document describes the equations used to determine the angle and tension required to move a log just before it begins to slide. It provides three equations setting the horizontal and vertical forces equal to the maximum static friction and torque, which are solved simultaneously to find the angle is 51 degrees when the coefficient of static friction is 0.8. The tension is then calculated to be 0.64 times the weight of the log.
P13 040
The flat roof of a building has an area of 870 square meters. The volume of material directly above an underground tunnel 60 meters deep is 52,200 cubic meters. With the material having a density of 2,800 kg/m3, the total mass supported by steel columns is 1.46 x 108 kg. The weight supported is 1.4 x 109 Newtons, requiring around 75 columns each able to support 400,000 Newtons over 960 square meters.
P13 039
1) The forces exerted by wires A (FA) and B (FB) on a log are related by the stretching of the wires based on their original lengths (LA and LB), cross-sectional areas, and Young's modulus.
2) Equating the total force on the log (FA + FB - mg) to 0 allows solving for FA and FB in terms of the known parameters.
3) FA is calculated to be 866 N and FB is then calculated from the total force equation to be 143 N.
P13 038
The brick compresses the two cylinders equally by an amount Δ. This means the force exerted by each cylinder is proportional to its cross-sectional area and elastic modulus. The ratio of the forces is 4:1. Combining this with the equation that the total force equals the weight gives the individual forces as 4W/5 and W/5. Computing torques about the center of mass confirms the 4:1 ratio of the distances of the forces from the center.
P13 037
The shear stress on an aluminum rod due to the weight of a 1200 kg object hanging from it is calculated to be 6.5 × 106 N/m2 based on the force applied, cross-sectional area of the rod, and radius. The shear modulus of the aluminum is used to calculate the vertical deflection of the rod under this stress as 1.1 × 10−5 m by relating the shear stress, length of the rod, and modulus.
P13 036
The Young's modulus (E) of a material was calculated from its stress-strain curve to be 7.5 × 1010 N/m2 based on a stress of 150 × 106 N/m2 and strain of 0.002. The linear range of the curve extended to approximately 2.9 × 108 N/m2, which represents the yield strength of the material where plastic deformation begins.
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