8.How many minutes does it take light from the sun to reach Earth? (The distance from the sun to Earth is 93 million miles; the speed of light is 3.00 × 108m/s)(4 points)The speed of light is 3*10 8 = 300,000,000 m/s˄93,000 miles = 149,668,992 000 meters - distance from sun to earth149,668,992,000/300000000 = 498.9 seconds - time for light from sun to reach earth498.9 seconds/60 seconds per minute = 8.3 minutes - time for light from sun to reach earth(Reference: Chang 1.43)9.Normal body temperature is 78.0°F. Calculate this temperature in degrees Celsius and Kelvin. (4 points)(78-32)*.5556= 25.6C and (78+459.67)*.5556= 25298.7K10. Bromine is a reddish-brown liquid. Calculate its density (in g/mL) if 586 g of the substance occupies 188 mL. (4 points)d = m/v 586 g wt of Bromine / 188 ml vol of Bromine = 3.12 g/ml density of Bromine.(Reference: Chang 1.21)11. Aluminum is a lightweight metal (density = 2.70 g/cm3) used in aircraft construction, high-voltage transmission lines, beverage cans, and foils. What is its density in kg/m3? 12. Calculate the mass of a cube of platinum of edge length 0.040 mm (the density of platinum = 21.4 g/cm3). (5 points)d = m/vOK the density is given in g/cm³, so let us work in cm. length of side = 0.04mm which is 0.004cm. Volume of cube = 0.004³ = 6.4*10^-8cm³ Density = mass / volume Mass = Density * volume mass = 21.4*6.4*10^-8
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- Fall '15
- Chemistry, Chemical substance, Chemical compound, Thomas Edison State College, Edison State University