Conceptual physics unit 4 Test Questions and Answer All Correct

Conceptual physics unit 4 Test Questions and Answer All Correct Which releases the most energy, 100 grams of 100 degrees C water cooling to 50 degree C, or 100 grams of iron at 100 degrees C cooling to 50 degrees C?(The specific heat of iron is 0.12 cal/g C) - Answer-Water Internal energy is the ? - Answer-Total amount of energy contained in an object Heat is measured in ? - Answer-calories, kilocalories, and joules Specific heat capacity is related to the amount of internal energy? - Answer-needed to change the temperature of one gram of a substance one degree Which has a higher specific heat capacity, water or sand? - Answer-water has a higher specific heat capacity. When an iron ring is heated, the hole becomes? - Answer-larger Which of the following expands most when the temperature is lowered? - Answer-water at 4 degrees C A bimetallic strip will bend when heated because? - Answer-each metal expands at different rates Apiece of iron(specific heat=0.12 cal/g C) and a cup of water both have the same temperature.If they are heated so the internal energy of each doubles? - Answer-both will have the same temperature One thousand calories of heat are added to 150 grams of water when its temperature is 33C. The resulting temperature of the water is? - Answer-40 C If you drop a hot rock into a pail of water,the temperature of the rock and the water will change until both are equal.The rock will cool and the water will warm.Does the same principle hold true if the rock is dropped into a large lake?Explain. - Answer-yes, even though the temperature change in the lake is barely noticeable, its temperature will still rise. If you stake out a plot of land with a steel tape measure using map measurements on a very hot day,will you enclose more or less land than on a very cold day? - Answer-you will enclose more land,because the steel in the tape measure expands,so the distance between its marks is greater than when it is cold. Temperature and Kinetic Energy - Answer-Temperature is related to the random motions of the molecules in a substance. It is closely related to the average kinetic energy of translational motion of molecules. Temperature Scales - Answer-The most widely used scale is the Celsius scale. On this scale, water freezes at 0 degrees and boils at 100 degrees. In the U.S., the most common scale is the Fahrenheit scale. On this scale, water freezes as 32 degrees and boils at 212 degrees. The scientific scale, is the Kelvin scale. It begins at the lowest possible temperature, absolute zero, -273 degrees Celsius (-460 degrees Fahrenheit). Heat - Answer-The energy that transfers from one object to another because of a temperature difference between them. The heat unit used in rating foods is a kilocalorie, or 1000 calories, or the heat required to raise the temperature of 1 kg of water by 1 degree Celsius. Specific Heat Capacity - Answer-The quantity of heat required to raise the temperature of a unit mass of a substance 1 degree. Different substances have different capacities for storing internal energy, and absorbed energy can effect substances in different ways. The more molecules move around, the higher their specific heat capacity. Therefore, water molecules have higher specific heat capacity than metals. Specific Heat Capacity Equation Q = mc delta T - Answer-c = specific heat capacity Q = quantity of heat m = mass delta T= triangle T= change in temperature