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BYU Exam Physical Science

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BYU Exam Physical Science What is the metric prefix for 100? - ✔✔hecto How many centimeters are in 15 millimeters? - ✔✔1.5 A group of students wish to test the brightness of a light bulb, so they perform an experiment. They take a light bulb and change the voltage supplied to it. What is the independent variable? - ✔✔Voltage A group of students wish to test the brightness of a light bulb, so they perform an experiment. They take a light bulb and change the voltage supplied to it. What is the dependent variable? - ✔✔brightness Jim ran 50 meters north and then walked 20 meters south. What was Jim's displacement? - ✔✔30 Joe is driving along the highway at 25 m/s. He slams on the brakes and comes to a stop in 5 seconds. What is his acceleration? - ✔✔-5 m/s(2) How much does a 7 kg bowling ball weigh? - ✔✔70 N Which of the following is a long-range force? - ✔✔Weight Find the x and y components of a 15 N force at a 20-degree angle. - ✔✔Fx = 14.1, Fy = 5.1 A 20 kg box sits on the floor. You push it with a 50 N force, and it accelerates at 1 m/s². How much friction must be present? - ✔✔30 N A 60 N force is exerted on an object, moving it 5 m. How much work is done on the object? - ✔✔12 J A spring exerts a 10 N force when it is stretched 2 m. What is the spring constant (k)? - ✔✔12 N/m What is the energy transformation taking place when a person runs? - ✔✔chemical to mechanical A 60 kg student has 300 J of gravitational potential energy. How high up is the student? - ✔✔5 m A 2 kg block is allowed to slide down a hill that is 10 m high. It reaches the bottom with a speed of 5 m/s. How much energy was dissipated by friction? - ✔✔50 J Find the volume of a cylinder that is 12 cm tall and has a radius of 3 cm. - ✔✔339 cm³ Convert 75 degrees Fahrenheit into degrees Celsius. - ✔✔23.9 When a solid becomes a liquid, this process is called - ✔✔melting How much heat is transferred when 3 grams of water at 0 degrees Celsius becomes ice? - ✔✔240 cal The temperature of 50 g of water is 70 degrees Celsius. How much heat must be added to raise the temperature to 80 degrees Celsius? - ✔✔500 cal The temperature of 24 liters of a certain gas is 300 K. If we change the temperature to 400 K, what is the new volume of the gas? - ✔✔32 liters A rock has a mass of 20 grams and a volume of 30 milliliters. What is the density of this rock? - ✔✔0.67 g/ml Is bronze an element, compound, mixture, or solution? - ✔✔Mixture Which type of radiation has the lowest amount of energy? - ✔✔alpha? If astatine undergoes beta decay, which element will result? - ✔✔Radon Write 3.4 × 104 as a standard number - ✔✔340,000 Write 0.00045 in scientific notation - ✔✔4.5 * 10^4 How many grams are in 2.5 moles of water? - ✔✔45 What is the gram formula mass of sulfur dioxide (SO2)? - ✔✔32? How many valence electrons does selenium have? - ✔✔6 Which of the following is an acid? - ✔✔HC2H3O2 What are the units of electric current? - ✔✔Amperes What kind of circuit is pictured above? - ✔✔Parallel How much energy would be produced if 2.23 x 1024 atoms of U-235 underwent fission? - ✔✔7.13 × 1013 J The distance from one crest to the next crest is called the - ✔✔Wavelength Which of the following colors of light has the lowest energy? - ✔✔Red

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