How many copper atoms are in a pure copper statue with a mass of 130 kgkg ? Express your answer to three significant figures.
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- Three measurements for the boiling point of water are 100.4 °C, 100.1 °C, and 100.0 °C. The accepted boiling point is 100.0 °C. (a) What are the estimated digits? The estimated digits are (b) How many figures are certain? figures are certain in each measurement. and respectively.PAGE 316 HOMEWORK CHAPTER 12 7. A ring made of gold (atomic weight 196.967) has a mass of 4.00 g. How many gold atoms are in it? Ans. 1.22 x 1022A sample of pure iron has a mass of 13.8 g. Calculate the number of moles in the sample and iron atoms in the sample. (a) moles in the sample moles (b) iron atoms in the sample atoms
- A man jogging has a metabolic rate of 658 W. (a) Calculate his volume rate of oxygen consumption in L/s. ? L/s (b) Estimate his required respiratory rate in breaths/min if his lungs inhale 0.620 L of air in each breath and air is 20.9% oxygen. ?breaths/minAssuming biological substances are 100% water, estimate the mass of a fly. Take a fly to be roughly a cylinder 4 mm long and 2 mm in diameter. kgOn a certain dry sunny day, a swimming pool's temperature would rise by 13 C° if not for evaporation. What fraction of the water must evaporate to carry away precisely enough energy to keep the temperature constant? Express your answer in decimal form, to at least two digits after the decimal point.
- Question 7Platinum 21.4 x 10 Uranium 18.7x 10 O Description 5 DETAILS SERCP11 7.5.P.044. A 737-kg satellite is in a circular orbit about Earth at a height above Earth equal to Earth's mean radius. (a) Find the satellite's orbital speed. m/s (b) Find the period of its revolution. (c) Find the gravitational force acting on it. Submit AnswerThe following is a practice question for an upcoming test: At a resting pulse rate of 77 beats per minute, the human heart typically pumps about 73 mL of blood per beat. Blood has a density of 1060 kg/m3. Circulating all of the blood in the body through the heart takes about 1 min for a person at rest. On average, what mass of blood does the heart pump with each heart beat in kg? mass per heart beat:
- In a hypothetical diesel engine the fuel is compressed from 528mL to 39.7 mL. This rasies the temperature of the fuel form 25°C to its ignition temperature of 210°C. If the fuel begins at 1.00atm, what is the pressure of the fuel at its ignition temperature.? Express your answer to 1 decimal place. Be sure to use the proper abbreviation of the UNITSJanice 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?…An ideal gas is in a room held at a constant temperature and the pressure set at 2 atmospheres (atm). The balloon’s initial volume is 40 cm3. If the pressure is increased to 8 atm, what is the new volume of the balloon?