A bicycle rider would like to compare the effective- ness of cantilever hand brakes [see figure part (a)] versus V brakes [figure part (b)]. (a) Calculate the braking force R, at the wheel rims for each of the bicycle brake systems shown. Assume that all forces act in the plane of the figure and that cable ten- sion T = 200 N. Also, what is the average compressive nor- mal stress o on the brake pad (A = 4 cm²)? (b) For each braking system, what is the stress in the brake cable (assume effective cross-sectional area of 1.077 mm² )? (HINT: Because of symmetry, you only need to use the right half of each figure in your analysis) B

An elastic with the elasticity constant of 20 N/m, and mass of 4 kg, is fastened to the ceiling and hanging down. Calculate the stress which occurs in it, if the cross-sectional area amounts 10 cm2.

A bead of mass m, embedded in a circular ring of radius R that is in a vertical plane, slides without friction from position A, at the top of the ring, to position B, describing an angle θ. What is the modulus of the account speed in B? Note: gravity acceleration is gChoose an option: (are in the image)

A wheelbarrow with w weight of  150N is used to lift a load with a weight of 900 N. The length from the wheel axle to the center of gravity (COG) of the load is 2 ft, and the distance to the (COG) of the wheelbarrow is 1.5 ft. The length from the wheel axle to the hands is 5 ft. The wheelbarrow is also tilted at an angle of 30 degrees with respect to the horizontal.   Calculate the motive force required to hold the wheel barrow