When looking at the reflected light from a soap bubble what colour will appear at the centre when it is illuminated normally by white light? Take n = 1.34 for soap, and let the soap bubble be 106.4 nm thick. Take the colour ranges to be: violet (400-446) nm blue (446-500) nm = = green (500-578) nm yellow (578-592) nm orange (592-620) nm = red = (620-700) nm Soap Bubble Reflected Light Eye

Locate the centroid of the volume of the solid shown where a hemesphire of radius r is mounted on top of a right circular cylinder of the same radius and altitude h

At room temperature (20°C) a 0.5-mm gap exists between the ends of the rods shown. At what temp will the two rods just touch one another?

The ability of the material to absorb energy without creating a permanent distortion is called. O a. Hardness O b. Tuohgness O c. Resilience O d. Rapture

At a temperature of 60°F, a 0.04-in. gap exists between the ends of the two bars shown in the figure. Bar (1) is an aluminum alloy (E-10,000 ksi; u= 0,32; a= 12.5 x10°/°F] bar with a width of 3 in, and a thickness of 0.75 in. Bar (2) is a stainless steel |E-28,000 ksi; u=0.12; a=9.6x10°/°F] bar with a width of 2 in. and a thickness of 0.75 in. The supports at A and C are rigid. Determine the normal stress in bar (1) at a temperature of 450°F

Please help me with this one. You can use the 2nd photo as reference. Subject: Strength of materials Topic: Thermal stresses

A gold-alloy microbeam attached to a silicon wafer behaves like a cantilever beam subjected to a uniform load (see figure). The beam has a length L = 24.5 um and rectangular cross section of a width b = 4.0 pm and thickness t = 0.88 um. The total load on the beam is 14.9 µN. If the deflection at the end of the beam is 1.53 um, what is the modulus of elasticity E, of the gold alloy (in GPa)? (Use the formulas of this example. The beam has constant flexural rigidity EI.) GPa

Environmental temperature has different influences on metals conductivity. Which one of the following statements is the most accurate? a. Copper conductivity increases significantly with the increase in temperature b. Electrical resistance of zinc increases at lower temperatures c. Electrical resistance of Iron increases dramatically at higher temperatures d. Electrical conductivity of aluminium increases dramatically at higher temperatures

At room temperature, a 0.6-mm gap exists between the ends of the rods as shown in Figure Q2 (a). At a later time when the temperature has increased by 120 degree Celsius, determine the followings: 0.6 mm 350 mm- ks A w B Figure Q2 (b) - 300 mm A Aluminum A = 2000 mm² E = 75 CPa Stainless steel A = 800 mm² E = 190 GPa a = 17.3 x 10-6/°C a = 23 x 16-6/°C Figure Q2 (a) a.) Calculate the support reaction R due to the increase in temperature b.) Calculate the stress and change in length of the stainless steel rod c.) If the rods are connected through the gap with a spring having spring constant ks = 10x10⁹ N/m as shown in Figure Q2 (b), recalculate the reaction R when the increase in temperature is 60 degress Ce is. B

At a temperature of 60°F, a 0.04-in. gap exists between the ends of the two bars shown. Bar (1) is an aluminum alloy [E = 10,000 ksi; v = 0.32; a = 12.3 × 106/°F] bar with a width of 3 in. and a thickness of 0.75 in. Bar (2) is a stainless steel [E = 28,000 ksi; v = 0.12; a = 8.9 x 10-6/°F] bar with a width of 2 in. and a thickness of 0.75 in. The supports at A and C are rigid. Determine the lowest temperature at which the two bars contact each other. (1) 3 in. 32 in. O 80.1°F O 118.6°F O 150.7°F O 132.9°F O 110.9°F B 2 in. 44 in. 0.04-in. gap