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Working professionals and students may find it tough to carve out time from their hectic schedules to get to the gym every day for a workout due to workload and studies. As a result, many people prefer to exercise at home instead of going to the gym. On the other hand, a gym workout or exercise done without following the required processor positions and without the supervision of a trainer might cause muscular damage. Additionally, hiring a personal trainer may not be within everyone''''s financial means.
By observing this situation suppose you are going to develop a mobile application, which will act as a virtual trainer. This application will guide the users on various body exercises with step-by-step positions with images. The users can keep a track of the data of day-to-day exercises. As a requirement engineer, which requirement elicitation technique will remain better for developing this application? Justify your answer with valid reasons in 3 to 4 lines only.
A force of 60 N is supported by the bracket as shown. Determine the resultant internal loadings acting on the section through point A.
A force of 60 N is supported by the bracket as shown. Determine the resultant internal loadings acting on the section through point A.
A gear with a width of 32 mm sits on a shaft with a diameter of 14 mm. The gear has a pitch diameter of 57 mm, the module 3 mm and a torque of 48 Nm.
1.What width should a standard wedge have?
2, What height should a standard wedge have?
3, What will be the safety against surface pressure for a steel wedge?
4, What will be the safety against surface pressure for a cast iron wedge?
5, What is the safety against surface pressure for a fixed boom connection?
6, If the gear is allowed to move axially during operation, what is the safety against surface pressure for the boom joint then?
7,Before manufacturing the booms in the hub, a center hole must be drilled. What is the hub's largest possible hole diameter before boom production begins?
A lamella coupling according to the figure below has friction surfaces between the diameters 135 and 105 mm. The coupling works with the surface pressure 36 N / cm2 and the friction number between the friction surfaces is 0.3. The lamella package is compressed by springs with the spring constant 610 N / cm per spring.
- What force do the springs compress lamella packages with?
- How much are the springs compressed?
- Determine the transferable torque if we assume that the frictional force attacks the average radius
A scooter has hydraulic disc brakes both front and rear. The brakes have a brake piston on each side of the disc. The average radius of the blocks' contact with the disc is 10 cm, the piston diameter is 20 mm and the steel disc weighs 0.8 kg. The coefficient of friction between the coating and the disc is assumed to be 0.4. The scooter weighs 160 kg including the driver and the weight distribution is 50% front and 50% rear regardless of whether you brake or not. The wheelbase (the distance between the center of the front and rear wheels) is 1.37 m and the wheel diameter is 0.45 m. Assume that you only brake with the front wheel and that the friction number between the tire and the road surface is 0.9. Steel has a specific heat capacity of 450 J / (kg ° C).
- What is the minimum possible braking distance (you brake so hard that the front wheel is on the verge of locking) when braking from 50 km / h to a standstill?
A scooter has hydraulic disc brakes both front and rear. The brakes have a brake piston on each side of the disc. The average radius of the blocks' contact with the disc is 10 cm, the piston diameter is 20 mm and the steel disc weighs 0.8 kg. The coefficient of friction between the coating and the disc is assumed to be 0.4. The scooter weighs 160 kg including the driver and the weight distribution is 50% front and 50% rear regardless of whether you brake or not. The wheelbase (the distance between the center of the front and rear wheels) is 1.37 m and the wheel diameter is 0.45 m. Assume that you only brake with the front wheel and that the friction number between the tire and the road surface is 0.9. Steel has a specific heat capacity of 450 J / (kg ° C).
- Which is the largest braking force that can be transmitted between the front wheel and the ground?
in a three-wheel planetary gear, the sun gear has 19 teeth and the planet wheels 17 teeth each. The teeth are not profiled. The energy is fed in via the sun wheel and taken out via the planetary bar. The load must be driven with a power of 1,000 W and rotated at a speed of 1,200 rpm. The efficiency between sun gear and planet gear is assumed to be 0.98 and between planet gear and ring gear to 0.96
- How many teeth does the outer sun gear have?
- What gear ratio does the gear have?
- What is the efficiency of the gear unit??
- What speed should the engine rotate with?
- What torque must the engine deliver?
In a slider crank mechanism the length of the crank OB is (174)mm and length of the connecting rod is (549)mm. The center of gravity G of the connecting rod is (324)mm from the slider A. crank speed is (574)rpm clockwise. When the crank has turned 45 deg. From the inner dead center
. Determine (using both relative velocity method and Instantaneous center method)
1. Velocity of the slider
2. Velocity of point G
3. Angular velocity of the connecting rod AB
The wall of a house consists of two 125mm brick walls with an inner cavity. The inside wall has a 10mm coating of plaster and there is a cement rendering of 5mm on the outside wall. In one room of the house the external wall is 4m by 2.5m
