- Slides: 83
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Which of the following is able to convert all thermal energy produced into useful work? nuclear power reactor gasoline engine stovetop range none of the above
none of the above
Heat will transfer from a high temperature area to a low temperature area by several different methods. The heat transferred by an electric stovetop coil to the teakettle is an example of transfer by convection combustion radiation conduction
If you thought that you were wrong, you are right!
Energy is not destroyed, but rather converted from one form to another. Describe the conversion of energy in the following process: A power reactor utilizes the process of uranium fission to create electricity. nuclear to electrical nuclear to thermal to electrical nuclear to mechanical to thermal to electrical nuclear to thermal to mechanical to electrical
nuclear to thermal to electrical
Sound waves are examples of what category of wave? A. longitudinal B. transverse C. mechanical both A and C
both A and C
60 g of KCLO 3 is added to a beaker of boiling water until no more will dissolve. As the solution cools to 30 degrees, 50 grams of KCLO 3 stays in solution. 50 grams of KCLO 3 comes out of solution. 10 grams of KCLO 3 comes out of solution. KCLO 3 will crystallize at this temperature.
50 grams of KCLO 3 comes out of solution. .
Laura navigates her kayak down a stretch of the Neuse River in 15 minutes. Her rate of speed over the course of the trip is 8 km/hr. How far has she traveled? 0. 12 km 120 km
Sound waves cause molecules to vibrate and bump into one another. For sound to travel, there must be molecules which can be made to vibrate. The closer together the molecules are, the faster the sound is able to travel. This explains why Sound travels faster in steel than in water. Sound travels faster in outer space than in air. Sound travels faster in air than in water. Sound travels faster in water than in steel.
Sound travels faster in steel than in water.
A submarine uses sonar to measure the distance between itself and other underwater objects. It sends out a sound wave, then records the echo that is reflected back by an underwater object. The speed of sound in water is about 1500 m/s. How far away is an object whose echo takes 5 seconds to return? 300 meters 7500 meters 3750 meters 15000 meters
Which of the following examples represents potential energy but not kinetic energy? An avalanche A coiled spring A hot air balloon in flight The pistons in a working engine
A coiled spring
Find the amount of work done when 30 N of force is used to lift a box 400 cm. 7. 5 Joules 13. 3 Joules 12000 Joules
When two light nuclei are forced to fuse, they form a heavier nucleus. During this process, a large amount of energy is produced. When the process is conducted at room temperatures and standard pressures, it is called cold fusion. In 1989, Stanley Pons and Martin Fleischmann announced at a press conference that they has produced cold fusion one time in their laboratory. All over the world, scientists rushed to their labs to try and duplicate the experiment. In the end, no one was successful. Pons and Fleischmann were harshly criticized in the science community for their premature announcement. What would have been the appropriate tool of communication for Pons and Fleischmann to share how they performed the experiment and the results they achieved? newspaper and television high school textbooks and workbooks scientific journals a podcast
Deuterium (H-2) is a common product of the fusion process. Which of the following atoms could undergo fusion to become deuterium? Li and H He and H H and a neutron
H and a neutron
A 12 N force is required to move a box 6 meters across a gravel driveway. How much work has been done? exactly 72 J exactly 2 J more than 72 J between 2 and 72 J
more than 72 J
The speed of an object increases 12 m/s over 3 seconds. What is its acceleration? 9 m/s 2 4 m/s 2 36 m/s 2
4 2 m/s
Tammy's room contains a lamp, a hair dryer, a radio and a TV. She uses an ohmmeter to determine that the overall resistance of the circuit increases as she plugs each appliance in. What kind of wiring is the circuitry in Tammy's house? series parallel mixed direct
How is the electron cloud model an improvement on Niels Bohr's model of the atom? The electron cloud model accounts for the location of the nucleus. The electron cloud model assigns electrons to orbital areas, rather than fixed orbits. The electron cloud model assigns electrons to fixed orbits, rather than orbital areas. The electron cloud model accounts for the mass and density of the nucleus.
The electron cloud model assigns electrons to orbital areas, rather than fixed orbits
Sodium has a violent exothermic reaction with water, producing hydrogen gas and a clear, aqueous sodium hydroxide solution. What else is produced in this reaction? gamma rays heat ice electricity
The speed of an object increases by 30 m/s in 10 seconds. What is its acceleration? 300 m/s 2 20 m/s 2 3 m/s 2 0. 33 m/s 2
3 m/s 2
Which of the following best explains the difference between melting and boiling points? The melting point is the temperature at which a gas becomes plasma. The boiling point is the temperature at which a gas becomes a liquid. The boiling point is the temperature at which a liquid becomes a gas. The melting point is the temperature at which a solid becomes a liquid. The melting point is the temperature at which a liquid becomes a gas. The boiling point is the temperature at which a solid becomes a liquid. The boiling point is the temperature at which a solid becomes a gas. The melting point is the temperature at which a gas becomes a liquid.
The boiling point is the temperature at which a liquid becomes a gas. The melting point is the temperature at which a solid becomes a liquid.
Marla uses a triple beam balance to mass her sample. Tim uses an analytical balance to mass his sample. Reisa uses water displacement to obtain the mass of her sample. Which student should perform his massing operation the most times, in order to ensure a reproducible result? Marla Tim Reisa Each student should perform his massing operation at least 10 times to assure reproducibility.
Jill places a message in a bottle and drops it off the side of a mountain, into the ocean. When does the bottles have the greatest kinetic energy? when Jill holds the bottle in her hand, just before dropping it just after Jill releases the bottle just before the bottles hits the surface of the water when it is floating on the water
just before the bottles hits the surface of the water
Shaquille has two test tubes full of water. He boils the water in Test Tube A. He adds green food coloring to the water in Test Tube B. In which test tube did a chemical change take place? Test Tube A Test Tube B in both test tubes in neither test tube
in neither test tube
A chemist has two magnesium (Mg) samples. One is a small, solid block. The other is a vial of powdered magnesium. He adds the small block of Mg to a water sample. Small bubbles slowly begin to form at the surface of the block. What will happen to the powdered Mg sample if the chemist adds it to a separate beaker of water? The powdered Mg sample will disappear. The powdered Mg sample will change color. The powdered Mg sample will bubble much more slowly than the solid sample did. The powdered Mg sample will bubble much more quickly than the solid sample did.
The powdered Mg sample will bubble much more quickly than the solid sample did.
Martina has three stoppered test tubes, each containing a different clear liquid. One is rubbing alcohol, one is water and one is corn syrup. What would be the best way for Martina to determine which one was rubbing alcohol? Look at all three samples under the microscope. Remove stopper on the test tube and waft the scent of the chemical toward her nose. Ignite all three samples. Place the unknown liquid in test tubes with unknown metals and observe the reaction.
Remove stopper on the test tube and waft the scent of the chemical toward her nose.
Which of the following questions can be answered through scientific investigation? Why does sugar taste better than salt? Has the yearly rainfall decreased this year? Why do robins prefer to eat worms over seeds? Which precious metal makes the best jewelry?
Has the yearly rainfall decreased this year?
Make your wager
The best explanation for the p. H of pure water being higher than rain water is rain water contains: water products from animals and humans. air pollutants that are acidic. salts that lower the p. H. salts that increase the p. H.
air pollutants that are acidic.