El Lenguaje De Las Mariposas

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SCIENCE DEPARTMENT
QUESTIONNAIRE
PHYSICS
7th Grade
2011-2012


NAME: _________________________________COURSE: _____L.N: ______ DATE: __________


1. Explain the differences among themechanical energy of a ball, its thermal energy, and its temperature.
2. . How much temperature is needed to rise the temperature of 50.0 g of water (4184 J/Kg ºC) from 4.5 ºC to 83.0 ºC?
3. Howmuch heat is added to 10.0 g of ice at -20.0 ºC to convert it to steam at 120.0 ºC? Specific heat of the ice is 2180 J/Kg ºC
4. Thermal energy is the ______________ of particle in a material.
5.What is the efficiency of a heat engine which transforms 400J into Mechanical Energy from a source of thermal energy of 5000J?
6. In a heat engine, a cold repository receives 6000J of heat from ahot source of 10000J, how much Energy is converted into mechanical Energy?
7. Which of the following materials in the table above would experience the largest temperature increase for a givenamount of heat input?
8. Describe how the particles of a substance behave at its boiling point.
9. A diver who is 10.0 m underwater experiences a pressure of 202 kPa. If the diver’s surface areais 1.50 [pic], with how much total force does the water push on the diver?
10. A car weighs 15,000 N, and its tires are inflated to a pressure of 190 kPa. How large is the area of the car’s tiresthat are in contact with the road?
11. A car weighing 15,000 N is on a hydraulic lift platform measuring 10 [pic]. What is the area of the smaller piston if a force of 1,100 N is used to lift thecar?
12. A volume of helium occupies 11.0 L at a pressure of 98.0 kPa. What is the new volume if the pressure drops to 86.2 kPa?
13. A helium balloon has a volume of 2.00 L at 101 kPa. As theballoon rises the pressure drops to 97 kPa. What is the new volume?
14. If a 5-L balloon at 25ºC were gently heated to 10ºC, what new volume would the balloon have?
15. Electric charges produces...