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Primetime 1. A student uses a hot plate, a thermometer, and a stopwatch to investigate the rate at which a metal object conducts heat. To ensure the most reliable results, which of the following should the student do? A Perform a second investigation using different tools B Use several thermometers to measure temperature C Develop a hypothesis before starting the investigation D Repeat the entire investigation several times Webquest Assignment Go to google Do a search for “Save Our Gravity webquest” This should be the first result and should say something about Gravitron the evil warlord. You may work with a partner to complete the webquest. When the fuse ignites the contents of a firework, oxygen is consumed as a result of which type of change? A Mass B Phase C Nuclear D Chemical A student compares the viscosities of two solutions at room temperature. The student uses a metal block and equal volumes of the two solutions in identical containers. Which procedure would provide the best comparison of the viscosities of the solutions? A Determining whether the block raises or lowers the density of either solution B Determining whether the block raises or lowers the temperature of either solution C Measuring the volume of liquid the block displaces in each solution D Measuring the time it takes the block to sink in each solution The elements in which of these sets have chemical properties that are the most similar? A) K, Ca, Sc B) O, S, Se C) Na, Ca, Y D) P, S, Cl Trigonometry is the study and solution of Triangles. Solving a triangle means finding the value of each of its sides and angles. The following terminology and tactics will be important in the solving of triangles. Right Trigonometry The three trig ratios: sine – sin cosine – cos tangent – tan 4.3 Right Trigonometry opposite sin hypotenuse 4.3 Right Trigonometry adjacent cos hypotenuse 4.3 Right Trigonometry opposite tan adjacent Ex 2: Sketch a triangle that has an acute angle , and find the other two trig ratios of . Then find . 5 sin 8 Ex 1: Solve for x. x 25˚ 5 Ex 3: Solve for x & y. x y 30˚ 5 Ex 4: Solve for x & y. x 8 45˚ y 4.3 Right Trigonometry Solve a Triangle: Find the measure of all its parts. Line of Sight: Horizontal Leg 4.3 Right Trigonometry Angle of Depression = Below Line of Sight Angle of Elevation = Above Line of Sight Solving If unknown is on top of your fraction in the trig function, multiply the number on bottom by your trig function If unknown is on bottom of your fraction in the trig function, divide the number on top by your trig function Ex 6: An airplane is flying at an elevation of 5150 ft, directly above a straight highway. Two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 and to the other is 52. How far apart are the cars? Ex 1: Find the value of the three trig ratios of A. A 7 B 4