According to the law of conservation of angular momentum if there is no unbalanced external torque acting on a rotating system‚ then the angular momentum of that system remains constant. This means that with no net change in external torque‚ the product of rotational inertia and rotational velocity at one time will be the same as at any other time. If the polar ice caps where to melt and the depth of the world’s oceans increased by 30m the mass of the polar ice caps would no longer be at the earth’s
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Joshua Berkebile 8-26-10 1st period Density Lab The purpose of this lab was to find the mass‚ the length‚ the width and the height of 4 different cubes so we could calculate the volume and density of them. We also had to find the density of irregular shapes by dropping them into a graduated cylinder than subtracting the starting water volume by the ending water volume. Density is how much mass is in a certain volume of matter. Volume is the amount of room that an object
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Aim:To discover what factors affect the rate of diffusion of potassium permanganate crystals in water. Statement:What will happen? How will room temperate solutions or heated solutions increase the rate of diffusion of the potassium crystals?Hypothesis:Heat will speed up the process of diffusion because heat will give out energy that will be able to speed up the process of spreading the potassium molecules. Materials:WaterVinegarPermanganate crystalsBunsen Burner IceGlass beakersSoapy waterProcedure:1
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Forces What Is a Force? Forces represent the interaction of distinguishable objects. Specific forces: The weight W with magnitude W = m * g acts near Earth’s surface with g the gravitational acceleration. (m= mass) The normal force N is due to contact with a surface. It is directed perpendicular to the surface. The tension T is due to a taut‚ massless string. It is directed along the string. The external contact force Fext acts along the direction of the push. Unit: Force and force
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Lesson 1.02 Speed‚ Velocity‚ and Acceleration Speed- measures the amount of distnace traveled in a given amount of time. (Doesn’t measure the direction of the travel) How fast an object is going with respect to a frame of reference. You find speed by dividing distance by time. (Speed = distance/time) Instantaneous speed- the speed you are traveling at that moment‚ instead of an average. Motion- change in position of an object‚ relative to a frame of reference. Frame of reference- place or object
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Experiment 1: Density | Purpose: To determine the density of the following liquids and solids. Data/Observation: Part A Sample | Distilled Water (g) | Methanol (g) | Glycerol (g) | Mass of empty cylinder | 41.1 g | 40.4 g | 41.1 g | Mass of cylinder + liquid | 51.2 g | 48.2 g | 53.8 g | Mass of liquid | 10.1 g | 7.8 g | 12.7 g | Calculations: Density of liquid = Mass/Volume = g/mL Distilled Water = 10.1g/10mL = 1.01 g/mL Methanol = 7.8g/10mL = 0.793 g/mL Glycerol = 12.7g/10mL
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OBJECTIVE To determine the change of standard Gibbs free energy for the decomposition of sodium hydrogen carbonate (NaHCO3) from the change of standard enthalpy and the change of standard entropy. THEORY Free energy is a state function that expresses the spontaneity of a chemical process in term of enthalpy and entropy change of a system under conditions of constant temperature and volume (Hemholtz free energy) and constant temperature and pressure (Gibbs free energy). It is a quantity of non-pressure-and-volume
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1. Describe the nuclear fusion reaction that occurs in stars. Page 294 Stars are made primarily of the almond hydrogen the most common material universe. As a star forms‚ gravity pulls the hydrogen into a dense ball that heats up. Electrons are torn from the hydrogen and other atoms‚ creating a plasma made up primarily of protons (the nucleus of the hydrogen atom) and electrons. Normally‚ protons would repel each other. As matter accumulates ending the new star however‚ the protons move
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Buoyant Forces The purpose of this lab is to calculate buoyant forces of objects submerged in water. The first step in the lab was to measure the mass of a metal cylinder‚ which was found to be 100g‚ and then to calculated it’s weight‚ which was .98 newtons. Then next step was to measure the apparent weight of the cylinder when it is completely submerged in a bath of water using the formula Wa=ma*g ‚ this was found to be 88.5grams. Knowing these two numbers‚ the buoyant force that the water
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Diagnostic Urinalysis Lab Introduction/Background Today’s lab exercise is about diagnostic Urinalysis. Urine reflects the many chemical components found in blood. This test is a good measure of health of endocrine system‚ kidneys‚ and urinary tract. Artificial urine samples are used for today’s lab thank goodness. The test that this lab is mostly focused on is called “dipstick” urinalysis test where students will analyze the chemical composition of urine by dipping the chemical indicator stick or
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