A cobalt block was heated in a calorimeter to increase its temperature by 41.5 °C. The energy produced by the experiment was 1,850 J. What was the mass of the cobalt block? Specific Heat (CCo =0.117 J/g ° C)

A earthquake is measured with wave amplitude of 1000 times as great as I0. What is the magnitude of this earthquake using Richter scale? A. 2.0 B. 2.5 C. 3.0 D. 3.33 The two liters solution contains 0.00004 moles of hydrogen ions. What is its pH level?A. 4.10 B. 4.40 C. 4.60 D. 6.80

F. 2.5(JK) 12 What is HL? = 7H %3D

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An engineer who accidentally inhaled poisonous fumes was given treatment for it. The concentration of poison in the engineer's blood was measured every hour. The table below shows the record: Hours Since Inhal ati on 1 5 Concentration 38.1 31.2 28.6 26.9 25.4 ug/ cm) The data in the table can be modelled by h = a +b lIn C, where h is the number of hours since the accident and C is the concentration of poison in the blood. If the engineer is allowed to return to work when the concentration of poison falls below 0.2, how many days must they wait to return to work? (Round your answer UP to the nearest day). Answer: 3. 2.

Use the table to the right to answer the following question. How many kilograms of combustible sedimentary rock would be required to supply the energy needs of country A for 1 year? Item Energy released by burning 1 kg of a certain combustible sedimentary rock Energy (joules) 1.6x 10° nts Energy released by fission of 1 kg of a certain isotope 5.6x 1013 7x 10 1x 1021 4x 1020 al Energy released by fusion of hydrogen in 1 liter of water Country A annual energy consumption Country B annual energy consumption It would take approximately kilograms. ess (Use scientific noteipn. Use the multiplication symbol in the math palette as needed. Round to three decimal places as needed.)

1. Can balloons hold more air or more water before bursting? A student purchased a large bag of 12-inch balloons. He randomly selected 10 balloons from the bag and then randomly assigned half of them to be filled with air until bursting and the other half to be filled with water until bursting. He used devices to measure the amount of air and water was dispensed until the balloons burst. Here's the data: Air (ft') Water (ft) 0.52 0.44 0.58 0.41 0.50 0.55 0.46 0.61 0.38 0.45 Does the data give convincing evidence air filled balloons can attain a greater volume than water filled balloons?

A steel cable with a nominal diameter of 32 mm (see the table below) is used in a construction yard to lift a bridge section weighing 42 kN, as shown in the following figure. Properties of Steel Cables Nominal Diameter Approximate Weight Effective Area Ultimate Load in. Ib/ft N/m in? mm2 Ib kN mm 0.50 12 0.42 6.1 0.119 76.7 23,100 102 0.75 20 0.95 13.9 0.268 173 51,900 231 1.00 25 1.67 24.4 0.471 304 91,300 406 1.25 32 2.64 38.5 0.745 481 144,000 641 1.50 38 3.83 55.9 1.08 697 209,000 930 1.75 44 5.24 76.4 1.47 948 285,000 1260 2.00 50 6.84 99.8 1.92 1230 372,000 1650 The table is to be used solely for solving this problem. The cable has an effective modulus of elasticity E = 140 GPa. (a) If the cable is 19 m long, how much will it stretch (in mm) when the load is picked up? (Use the deformation sign convention.) mm (b) If the cable is rated for a maximum load of 65 kN, what is the factor of safety with respect to failure of the cable?

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evlo 5.) The number of butterflies in Southern Nevada is modeled by N = 100 ekt where t is the time in weeks. If N = 300 when t = 5, estimate the time required for this population to double in size. (Round to the nearest tenth of a week.) %3D