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PS FINAL 2
Math Problems
| Question | Answer |
|---|---|
| 2.00 kb of hot water at 70.0 C is combined with 3.00 kg of cold water at 5.00 C in a well-insulated calorimeter. What is the final temp. of the mixture? A. 40.0 C B. 37.5 C C. 31.0 C D. 45.0 C | 31.0 C |
| After eating a 425.-Calorie meal, you are able to perform 500.kJ of work. Assuming this includes the work the heart and lungs do, and you don't gain or lose any weight, how efficient is your body? (4.19 joules - 1 calorie)? | 28.1 % |
| Determine the equivalent of 17.5 F on (a) the Celsius scale (b) the Kelvin Scale | (a) -8.06 C (b) 265 K |
| How much heat is required to raise the temperature of 15.6 kg of copper by 75.0 C? (c copper = 0.094 cal/g x C) | 110. kcal |
| What is the current through a 68.0-watt lamp that operates at 117 volts? | 0.581 a |
| Express -56.3 C in F | -69.3 F |
| Two resistors of 18.0 and 11.0 ohms are connected in parallel in a circuit with a 9.00-volt battery. What is the total current in the circuit? | 1.32 a |
| If 2450 kcal of heat is added by a gas hot water heater to 160. kg of bathwater, by how much does the temperature increase? | 15.3 C |
| In hydrogen, the simplest atom, the electron and the proton are separated by 0.530 angstrom unit (1 A = 10^-10 m). If the charge on each is 1.60 x 10^-19 coulomb (- for the electron, + for the proton), what is the electrical force between them? | -8.20 x 10^-8 N |
| A force of 15.7 newtons eastward is applied to a cart having a mass of 4.15 kg. What will the acceleration be? | 3.78 m/s^2 East |
| If a person weighs 150 lbs on Earth, how much would they weigh on the moon, where the force of gravity is only 1/6 as great? | 25 lb |
| What is the momentum of a 100.-kilogram fullback moving at 6.50 m/s? | 650 kg.m/s |
| A 500-g mass drops from a height of 12.0 meters. What is its speed just before it hits the ground? | 15.3 m/s |
| A 150.-gram lump of clay moving eastward at 10.0 m/s collides with a 200.-gram lump of clay moving in the same direction at 6.00 m/s. The two coalesce after impact. With what velocity does the combined mass move? | 7.71 m/s East |
| A 1500-kg car drives up a mountain road a vertical rise of 1200 m from the base elevation in 28.0 min (28 * 60 = 1680 s). What is the average power output? (Assume 3 sig fig) | 10500 watts |
| A 1525 kg racecar makes a turn at the Indianapolis 500. The radius of the curve is 25.0 m and the force needed to hold the car in the curve is 5.32 x 10^4 N. How fast was the car going? | 29.5 m/s |
| A flight attendant pulls a wheeled suitcase, applying a 63-N force at a 37 degree angle to the horizontal. How much work does she do in pulling the suitcase 43 m? | 2200 J |
| A car slows down experiencing a change in momentum of -7.70 x 10^3 N.s over a period of 3.00 s. What is the average force exerted on the car during this time? | -2570 N |
| The Earth's radius is around 4000 miles. What is the gravitational force on a satellite orbiting at 8000 miles from the Earth's center if it weighs 300 lb when on the Earth's surface? | 75 lb |
| A plane is climbing with a velocity of 177 m/s at an angle of 23 degrees to the horizontal. Determine the horizontal and vertical components of its velocity. | Horizontal = 163 m/s Vertical = 69.2 m/s |
| An automobile traveling at 27.3 ft/s accelerates at a constant rate of 3.62 ft/s^2 for 14.5 s. Determine its velocity at the end of this time. | 79.8 ft/s |
| How many molecules are there in 47.7 g of I_2? (Remember to multiply 2 times the atomic mass of iodine) | 1.13 x 10^23 molecules I_2 |
| What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen? | KCLO_3 |
| Name each of the following ionic compounds. Be sure to include Roman numerals where appropriate. A. CuSO_3 B. SN(C_2O_4)_2 C. K_2SiO_3 D. Pb(CrO_4) E. Zn_3 N_2 | A. copper (II) sulfite B. tin (IV) oxalate C. potassium silicate D. lead (II) chromate E. zinc nitride |
| Calculate the percent composition of isopropyl alcohol C_3 H_8 O. | C 60.0% H 13.3% O 26.7% |
| A man walks 3.57 mi due east, then turns and walks 2.80 mi due north. How far and in what direction is he from the starting point? | 4.54 mi 38.1 degrees N of E |
| Write the formulas of the following compounds A. bismuth phosphite B. iron(III) fluoride C. lead (IV) arsenate D. aluminum sulfate E. ammonium dichromate | A. BiPO_3 B. FeF_3 C. Pb_3(AsO_4)_4 D. Al_2(SO_4)_3 E. (NH_4)_2 Cr_2 O_7 |
| Express the following numbers in scientific notation. A. 0.000 263 B. 27 600 | A. 2.63 x 10^-4 B. 2.76 x 10^4 |
| Name the elements associated with the following electron configurations. A. B. C. D. E. | A. Li B. Mg C. Fe D. Se E. Sb |
| Carry out the following conversions: A. 2.00 in to cm B. 6.60 lb to kg C. 2.00 ft to cm D. 3.00 L to qt | A. 5.08 cm B. 3.00 kg C. 60.96 cm = 61.0 cm D. 3.17 qt |
| How many significant figures are in each of the following numbers? A. 27 600 B. 7840 C. 0.182 D. 0.0230 | A. 3 B. 3 C. 3 D. 3 |
| Write the electron configuration notation and the orbital notation for each of the following. A. vanadium, V B. nitrogen, N C. Aluminum, Al | electron config notat & orbital notat |
| Rewrite the following in scientific notation using the SI base units. 1 centigram = 10^-2 grams 1 kilogram = 10^3 grams 1 kilometer = 10^3 meter A. 4.5 centigrams B. 64 kilometers | A. 4.5 x 10^-5 kg B. 6.4 x 10^4 m |
| For each of the following, give the atomic number Z, the mass number A, and the number of electrons, protons, & neutrons. A. 10/6 C B. 24/11 Na C. 235 / 92 U | Z A E P N 6 10 6 6 10-6=4 11 24 11 11 24-11=13 92 235 92 92 235-92=143 |
| A speed of 55.0 miles per hour is the same as how man kilometers per hour? (1.61 km = 1 mile) | 88.6 km/hr |
| Density equals mass divided by volume. D=M/V A. solve this equation for M B. solve this equation for V | A. M=DV B. V=M/D |
| From the following information, determine the average atomic mass of copper. isotope mass(u) Nat abun (%) Cu-63 62.929 599 69.17% Cu-65 64.927 793 30.83% | 63.55 amu |
| Calculate the weight in Newtons of a 97.0-kg person. | 951 N |
| The earth exerts a net force of 2300 Newtons on a satellite to keep it in orbit around the Earth. What is the force the satellite exerts on the Earth? | 2300 N |
| Write the chemical formula of the compound formed from each of the following combinations. Then write the name of the compound. A. Zn + S B. Copper (II) + Perchlorate C. Aluminum + silicate D. Fe(III) + O E. Calcium + Nitrate F. NH_4 + P | A. ZnS - Zinc Sulfide B. Cu(CIO_4)_2 - Copper(II) Perchlorate C. Al_2(SiO_3)_3 - Aluminum Silicate D. Fe_2 O_3 - Iron(III) Oxide E. Ca(NO_3)_2 - Calcium Nitrate F. (NH_4)_3 P - Ammonium Phosphide |
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niinimoshe
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