A contractor requires a cement mix that is 70% sand and 30% cement. He has 1400 kg of a cement mix that is 80% sand and 20% cement. How much cement should he add to this 1400 kg cement mix so that he gets the required mix?
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A contractor requires a cement mix that is 70% sand and 30% cement. He has 1400 kg of a cement mix that is 80% sand and 20% cement. How much cement should he add to this 1400 kg cement mix so that he gets the required mix?
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- Problem 1: Answer the following questions using the table to the right. Medium Gases at 0 °C, 1 atm Air Carbon dioxide Hydrogen Oxygen 1.000293 1.00045 1.000139 1.000271 Liquids at 20 °C Benzene Carbon disulfide Carbon tetrachloride Ethanol Glycerine Water, fresh 1.501 1.628 1.461 1.361 1.473 1.333 Solids at 20 °C Diamond Fluorite Glass, crown 2.419 1.434 1.52 Glass, flint |Ice (at 0 °C) Polystyrene Plexiglas Quartz, crystalline Quartz, fused Sodium chloride 1.66 1.309 1.49 1.51 1.544 1.458 1.544 Zircon 1.923 Part (a) Calculate the index of refraction for a medium in which the speed of light is 2.012 × 10°. Numeric : Anumeric value is expected and not an expression. Part (b) Determine the most likely identity of the substance based on the table in the problem statement. MultipleChoice : 1) Carbon tetrachloride 2) Diamond 3) Ethanol Sodium chloride 5) Plexiglass 6) Water, fresh 7) Glycerine 8) Polystyrene 9) Glass, crown 10) Glass, flintA small bubble rises from the bottom of a lake, where the temperature and pressure are 8°C and 6.4 atm to the water’s surface where the temperature is 25°C and the pressure is 1.0 atm. Calculate the final volume (in m3) of the bubble if its initial volume was 2.1 cm3.Janice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…
- When working on a PHYS 1510 weekly assignment, a student decided to get a medium double double coffee from Tim Hortons (a coffee made with two creams and two sugars). After drinking it, the student looked up the nutritional value of the drink, and was shocked to find it was listed as 230.0 kcal (230.0 nutritional calories). After drinking the coffee, they weighed 87.88 kg. To work off all the calories, the student decides to climb the stairs in their building. How many floors do they need to climb to burn off the entire drink? (do not include units) Assume all floors are 3.00 m apart from each other. Assume all nutritional energy is fully converted to potential energy. 1 kcal = 4184 Jthe average density of an atom is approximately 103 kg/m3. The nucleus of an atom has a radius about 10-5 times that of the entire atom, and contains nearly all the mass of the atom. What is the approximate density, in kilograms per cubic meter, of a nucleus?A rectangular block of cadmium has a length of 1.5 m and a width of 50 mm. If the mass of the block is 50g and the density of 8.64 g/cm3, what is the height of the block?
- A gas is held in a container with volume 516 cm3. If the pressure of the gas inside the container is 100 kPa, what is the pressure of the gas, in the unit of kPa, when it is expanded to 733 cm3? Assume that the temperature of the gas does not change.Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 4.041 g, is pressed into a leaf of 1.423 μm thickness, what is the area of the leaf? (b) If, instead, the gold is drawn out into a cylindrical fiber of radius 2.900 μm, what is the length of the fiber?The temperature of the fluid is measured with a Fahrenheit thermometer as well as a Kelvin thermometer. If the numerical reading is the same for both thermometers, what is the temperature of the fluid in °R?
- A cube-shaped block of wood has a density of 750 kg/m3 and a mass of 49 kg. What is the length of any side of the wooden block in meters?Consider a pressure versus volume graph, where the different curves represent different processes done on a gas. Starting at the origin to point 1, the pressure and volume are increased to 2913 Pa and 4.25 m³, respectively. From 1 to 2, the gas expands at constant pressure to a volume of 7.25 m³. From 2 to 3, the pressure rises to 4082 Pa. Finally, from 3 to 4, the gas expands again to 10.85 m³. Rank the curves from the most positive to the most negative amount of work done on the gas. Pressure (Pa) 0 1 3 2 Volume (m³) What is the total work done on the gas? 4 Wo-4 = Most positive work Incorrect 29624.325 23 0 → 1 1 → 2 3→ 4 Most negative work Answer BankGold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 3.663 g, is pressed into a leaf of 2.187 um thickness, what is the area of the leaf? (b) If, instead, the gold is drawn out into a cylindrical fiber of radius 2.200 um, what is the length of the fiber? (a) Number i 1.429 Units m^2 (b) Number 72.56 Units