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Physics 5 Sept

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physics exercises
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  Name : __________________ Date: _______________________ 1. A small amount of smoke is blown into a small glass box. A bright light is shone into the box. When observed through a microscope specks of light are seen to be moving around at random in the box.A What are these bright specks of light! What evidence doe this provide for the kinetic model of matter!#. rownian motion is observed when looking at smoke particles in air using a microscope. What causes the smoke particles to move at random! A $moke particles are hit b% air molecules. $moke particles are moved b% convection currents in the air. & $moke particles have di'erent weights and fall at di'erent speeds. D $moke particles hit the walls of the container. (.)he molecules of a substance become more closel% packed and move more *uickl%. What is happening to the substance! A A gas is being heated and compressed. A gas is being heated and is expanding. & A li*uid is boiling. D A li*uid is evaporating at room temperature.+.A hot drink is left in a room that is at a temperature of #,-&. What has happened to the drink after ten minutes! A ts densit% is lower. ts internal energ% is lower. & ts particles have e*ual energies. D ts particles move more *uickl%.  /.A heater supplies 0, of energ% to a block of metal. )he temperature of the block rises b% #,-&. What happens to the block of metal when its temperature falls b% 1,-&! A ts internal energ% decreases b% +,. ts internal energ% decreases b% 12,. & ts internal energ% increases b% +,. D ts internal energ% increases b% 12,. 6.Mountaineers who climb in high places often use cylinders of oxygen.A cylinder contained 0.25   m 3 of oxygen at 150 !a pressure. he pressure of the atmosphere is 100 !a.#alculate the $olume of oxygen when it is all released from the cylinder into the atmosphere. P 1 V 1  = P 2 V 2 ...................................................................................................................................................................................................................................................................................................................................................................................................... m 3 3.A puddle and a small bowl are next to each other. )here is the same amount of water in each.a45xplain wh% the puddle dries out more rapidl% than the water in the bowlb46ive two changes that would make the puddle dr% out even more rapidl%.0.f %ou are wearing wet clothes and the water evaporates it cools %ou down. 7ow does the kinetic theor% explain the cooling e'ect!a.6ive two practical uses of the cooling e'ect of evaporationb.What is the di'erence between evaporation and boiling!8.)he air in a closed c%linder at a pressure of /,,,,9a and at #3 o & is heated to ##3 o &. What is its new pressure!  1,. A xed mass of gas has a volume of +m (  at #3 o & and at a pressure of 1/, ,,,9a. )he pressure is now reduced to 1,, ,,,9a and the volume is decreased at the same time to ,./m. What is the nal temperature of the gas!11. f the temperature of a gas is raised what happens to the pressure of the gas if its volume sta%s the same! 1#. What happens to the molecules of an ideal gas at absolute ;ero!1(. What is the value of absolute ;ero in degrees centigrade!1+. What is: <i4 , o & in =  <ii4 1,, o & in =  <iii4 (,, = in o &1/. f + litres of gas at #3 o & are heated to 1#3 o & at a constant pressure what will be the new volume of the gas!12. What happens to the pressure of the air in a car t%re during a long >ourne% on a hot da%!13. Which of the following graphs shows:<i4 temperature against pressure for a gas at constant volume<ii4 volume against pressure for a gas at constant temperature <iii4 pressure x volume against volume for a gas at constant temp. <iv4 volume against temperature for a gas at constant pressure A &
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