of the two blobs stuck together immediately after the collision? A 10-kg bowling ball moving at 4 m/s bounces off a spring at about the same speed that it had before bouncing. What is the change in momentum of the bowling ball? A loaded freight car has 5 times as much mass as an empty freight car. If the loaded car coasts at 5 m/s and collides with and attaches to the empty car at rest‚ what will be the speed of both cars after collision? A 50-kg cart moving at 100 km/h collides head-on
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C1. A room in a house has a floor area of 120 ft2. Which of the following is most likely the approximate volume of the room? b. 30 m3 C2. When SI units are plugged into an equation‚ it is found that the units balance. Which of the following can we expect to be true for this equation? a. The equation will be dimensionally correct. C3. How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order
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he only chemical elements which are stable multi atom homonuclear molecules at standard temperature and pressure (STP)‚ are hydrogen (H2)‚ nitrogen (N2) and oxygen (O2); plus two halogens‚ fluorine (F2) and chlorine (Cl2). These gases‚ when grouped together with the monatomic noble gases; which are helium (He)‚ neon (Ne)‚ argon (Ar)‚ krypton (Kr)‚ xenon (Xe) and radon (Rn) ; are called "elemental gases". Alternatively they are sometimes known as "molecular gases" to distinguish them from molecules
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force can be extracted and found to be equal to the change in momentum of an object provided the mass is constant: |[pic] |Calculation | The main utility of the concept is in the study of the average impact force during collisions. For collisions‚ the mass and change in velocity are often readily measured‚ but the force during the collision is not. If the time of collision can be measured‚ then the average force of impact can be calculated
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Airbags are very effective in saving lives; you are 30% less likely to die in a front end collision because of them. However‚ they are not made for small people and can therefore sometimes work against their purpose. There have been many instances of children getting injured by airbags‚ and 284 were killed between 1990 and 2004 by airbags. Luckily
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GRAVITATION Kepler’s Laws Towards the end of the sixteenth century‚ Tycho Brahe collected a huge amount of data giving precise measurements of the position of planets. Johannes Kepler‚ after a detailed analysis of the measurements announced three laws in 1619. 1. The orbit of each planet is an ellipse which has the Sun at one of its foci. 2. Each planet moves in such a way that the (imaginary) line joining it to the Sun sweeps out equal areas in equal times. 3. The squares of the periods
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Meter Stick Meter Stick Meter Stick The purpose of this experiment is to use the ballistic pendulum to determine the initial velocity of a projectile using conservation of momentum and conservation of energy as well as motion of projectiles. Carbon Paper Meter Stick Ballistic Pendulum In this experiment a steel ball will be shot into the bob of a pendulum and the height‚ h‚ to which the pendulum bob moves‚ as shown
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The law of momentum conservation allows a collision between two objects in an isolated system (space)‚ the momentum lost in the first object is equal to the momentum gained of the second object after the collision occurred. The forces of the two objects act between them at a given velocity and time‚ since they are equal in magnitude they will split in opposite directions. The formula shown is used to derive momentum using calculus‚ which means in Newton’s second
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because...it’s a bit tedious drawing them!) It is assumed that all collisions are elastic. (Consider what would happen if the collisions were not elastic.) When a molecule collides with the wall‚ a change of momentum occurs. The change in momentum is caused by the force exerted by the wall on the molecule. The molecule exerts an equal but opposite force on the wall. The pressure exerted by the gas is due to the sum of all these collision forces. Why the Pressure Exerted by a Gas Increases as the Temperature
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he assumed that the Sun would start to radiate away its heat‚ finally causing itself to cool down. In reaction to this cooling‚ the Sun’s gases would exert pressure‚ causing itself to contract. As explained by the law of conservation of angular momentum‚ the reduction in size would be led by an increase in the rotational velocity of the Sun. Centrifugal acceleration would push material outward‚ while the gravitational attraction would pull the material inward. Once these forces are finally balanced
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