Problem 1: A package is released down on a ramp from the height hı, slides down and compresses the string by an amount d at the end of the ramp. Once the spring bounces back the package is pushed back on the ramp and travels up on the ramp until it momentarily stops at distance lz from the compressed position of the spring. If the coefficient of friction u = 0.3, angle a = 30°, spring deflection d = 0.1 m and length of the ramp package travels l; = 2.5 m, determine the height h2 the package will reach after it bounces back. Solve the problem using the principle of Conservation of Energy Is the answer below correct?

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c