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A man stands on a slope of 20 degrees.His weight is 65kg. Given that the coefficient of static friction is 1.5, Calculate the maximum angle that the slope can have to the horizontal before he begins to slide. Also how does the pressure on his feet change...

13 years ago

Optical density (0.0.) is defined as the logarithm (power of ten) of the attenuation of light transmitted through protective eye wear at a particular wavelength. For example, if glasses attenuate light at 1,064 nm. to 1 / 100,000 of its original intensity...

13 years ago

A car is travelling on a banked circular racetrack, Given that the track is banked at an angle of 16degree to the horizontal and the radius of the track is 50 metres and there are no friction forces present a) draw a free body diagram of the car b)calcula...

13 years ago

An exercise bicycle's flywheel is 30cm in diameter and 2.5 cm thick and is constructed from steel (density=7850 kg m3) its moment of inertia is 0.156 kg m2 about its axis of rotation a) calculate the mass of the flywheel b) calculate the flywheel's radius...

13 years ago

a stationary car is hit from behind by another car travelling at 40km per hr. After collision both cars remain locked together. The masses of the stationary car and the moving car are 1500kg and 1300kg respectively (use g=9.8ms-2) a) is this an elastic or...

13 years ago

a ball of mass 200 g is thrown vertically upwards with a velocity of 20ms-1 ignoring air resistance. a) calculate the kinetic energy of the ball as it is released b)calculate the maximum height reached by the ball c) state the velocity of the ball when it...

13 years ago

calculate the following body segment parameters for the thigh of a subject with a height of 180cm and mass of 72kg a) segment mass b) segment length c) centre of mass position relative to proximal end d) radius of gyration about proximal end e) Moment of...

12 years ago

A subject with a height of 165cm and mass of 69 kg is sitting with his lower limb positioned with hip in 90 degree of flexion and knee in full extension and foot in 90 degree of dorsiflexion a) calculate the inter-segment force at the knee joint b)Calcula...

12 years ago

a)Describe the structure of the contractile elements of skeletal muscle b)Sketch a graph of the relationship between developed tension and muscle length and explain the shape of the curve in terms of the interaction between thick and thin myofilaments C)...

12 years ago

Briefly describe the distribution problem and the two techniques used to overcome it.

12 years ago

3. Calculate the magnitude of the force required to cause an anterior dislocation of the glenohumeral joint given that he force has a lever arm of 52 cm, the maximum magnitude of the resistance force is 1080 N and the resistance force has a lever arm of 4...

12 years ago

for a man of mass 75kg and height 185 cm claculate the following using standard anthropometric data. 1. length of his upper arm 2. mass of his upper arm 3. position of the centre of mass of his upper arm relative to the glenohumeral joint 4. radius of gyr...

12 years ago

When a weight-lifter lifts a weight equal to his upper body weight his trunk makes an angle of 40 degrees, with the vertical, as shown in the diagram below. In this position the erector spinae muscles exert a large force on the sacrum at an angle of 40 de...

12 years ago

following data was obtained from a tensile test of steel. The test specimen was 15mm in diameter and 50 mm in length Load (kN) Elongation(mm) 5 0.005 10 0.015 30 o.048 50 0.084 60 0.102 64.5 0.109 67 0.119 68 0.137 69 0.160 70 0.229 72 0.300 76 0.424 84 0...

12 years ago

A cylindrical steel bar is required to support a load of 650 N. the required bar must be 0.17 m in length and must not deform by more than 0.015 mm. given that the Young's modulus of steel is 210 GPa, calculate the minumum diameter of the bar.

12 years ago

A steel cable of length 10 m and cross-sectional area 1200 mm2 is loaded with an object of weight 30 kN. Given that the cable is not loaded beyond its proportional limit and Young's modulus of steel is 210 GPa, draw a stress-strain curve for the loaded ca...

12 years ago

following data was obtained from a tensile test of steel. The test specimen was 15mm in diameter and 50 mm in length Load (kN) /Elongation(mm) 5 /0.005 10 /0.015 30 /0.048 50 /0.084 60 /0.102 64.5 /0.109 67/ 0.119 68 /0.137 69/ 0.160 70 /0.229 72 /0.300 7...

12 years ago

A steel bar with a cross sectional area of 25cm2 is found to shear fracture when subjected to a tensile load of 400kN. calculate the limiting shear stress of the bar.

12 years ago

A steel beam with a rectangular cross section is bent to form an arc of a circle of radius 6 m. Calculate the maximum stress in the beam given that the depth of the beam is 6 mm and the Young's modulusfor steel is 210 MPa

12 years ago

A hollow circular shaft has an external diameter of 160mm and an internal diameter of 120mm. Calculagte the polar second moment of areaof the shaft and the maximum and minimum shear stress produced when the applied moment is 40kN m.

12 years ago

The second moment of area of a hollow cylindrical beam with an inner radius of 18mm and an outer radius of 20mm is equal to A) 2.7x10-9m 4 B) 4.3x10-8 m 4 C) 7.9x10 - 13m 4 D) 2.7x10 3 m 4

12 years ago

6. A flat plate specimen of a soft metal alloy is to be tested by pulling on round pins inserted through the ends of the plate, as illustrated below (a) Calculate the required diameter of the pins, given that the plate is 8.0 mm thick, the maximum tensile...

12 years ago

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calcula...

12 years ago

Select the correct answer.The change in length of a steel wire under an applied load can be halved by keeping all other conditions constant but using: A. A different material having a Young's modulus half that of steel B half the cross sectional area of t...

12 years ago

an aluminium alloy bar with a Young's modulus of 70GPa is under a tensile stress of 10MPa, Which of thefollowing is the equal to the strain in the bar? A 0.0014 B 7.0x10raise to the power3 c 700 D 1.4x10 raise to the power -4

12 years ago

A metal bar with a cross-sectional area of 50mm2 is subjected to a tensile strain of 0.001. What is the tensile force responsible for the strain given that the material has a Young's modulus of 15GNm raise to the power -2 A 0.003N B 7.5x10 raise to the po...

12 years ago

An aluminium alloy bar with a Young's modulus of 70GPa is under a tensile stress of 10MPa, Which of thefollowing is the equal to the strain in the bar? A 0.0014 B 7.0x10 3 c 700 D 1.4x10 -4

12 years ago

The change in length of a steel wire under an applied load can be halved by keeping all other conditions constant but using:which of the following is correct A. a different material having a Young's modulus half that of steel B half the cross sectional ar...

12 years ago

a mild steel bar of length 10cm and width of 10mm is extended by 0.01 mm. Which of the following is equal to the change in width of the bar.(The Poisson's ratio of mild steel is 0.31) A 3.1x10-4mm B -3.1x10-4mm C 3.1x10-5mm D -3.1x10-5mm

12 years ago

A mild steel bar of width 10mm is subjected to a tensile stress of 3,0x105 Pa. Given that Young’s modulus for mild steel is 200 GPa and Poisson’s ration for mild steel is 0.31, calculate the change in width of the bar. Is the width increased or reduced?

12 years ago

Sketch a typical stress-strain curve and label all the points of interest and different regions of the curve.

12 years ago

Sketch a stress-strain curve for glass and label all the points of interest and different regions of the curve.

12 years ago

Sketch a stress-strain curve for which the stress is calculated using the actual cross-sectional area rather than the original cross-sectional area. Explain why this curve differtypical stress-strain curve

12 years ago

Use a sketch to illustrate what cantilever bending is and give an everyday example of it. (b) use a sketch to illustrate what three-point bending is and give an everyday example of it. (c) For each of the two beams shown below: (i) calculate the maximum m...

12 years ago

Sketch two S-N curves on the same axis, one for a metal with an endurance limit and one for a metal without an endurance limit. Mark any points of interest on the curves.

12 years ago

The change in length of a steel wire under an applied load can be halved by keeping all other conditions constant but using: A. a different material having a Young's modulus half that of steel B half the cross sectional area of the steel wire C half the l...

12 years ago