GEAS FINALS

• Equilibrant force


  The force that balances two or more forces acting on an object, resulting in no net force and no acceleration
• Vectors


  • Quantities that have both magnitude and direction
• Scalar quantities do not have direction
• Isentropic expansion


  1. No heat transfer

  2. Temperature decreases

  3. Pressure decreases
• Enthalpy


  The sum of a system's internal energy and the work done on the system by its environment due to changes in pressure and volume
• Enthalpy of an ideal gas is a function only of temperature
• Work and energy can be a function of force and distance, but not force and time
• The expression U + PV is called enthalpy
• Entropy is a measure of randomness or disorder
• In an adiabatic process, there is no heat transfer
• In a quasistatic process, the system is always in equilibrium
• In a reversible process, the system can be returned to its initial state without leaving any change in the surroundings
• Modulus of rigidity is the ratio of shear stress to shear strain
• Goodwill is the element of value which a business has earned through the favorable consideration and patronage of its customers arising from its well known and well conducted policies and operations
• Subsonic travel has a Mach number less than 1
• Supersonic travel has a Mach number greater than 1
• Transonic travel has a Mach number around 1
• Hypersonic travel has a Mach number much greater than 1
• Simple interest is calculated as principal x rate x time
• Compound interest is calculated as principal x (1 + rate/n)^(n*time)
• In an experiment to determine the specific heat of copper, a piece of copper weighing 50 g is first heated and then dropped into a known mass of water at a lower temperature
• Rigidity


  The ratio of linear stress to longitudinal strain
• Entropy


  Measure of randomness or disorder
• Isentropic process


  No heat transfer
• Work or Energy cannot be a function of temperature and entropy
• Enthalpy of an ideal gas


  Function of temperature only
• Specific heat experiment


  • Copper piece heated to 100°C, then immersed in 27°C water, final temperature 30°C
• Specific heat of copper is 0.88 Cal/g-deg-C
• Heat required to change 30 kg of water at 20°C into steam at 100°C is 77,757 kJ
• Increase in temperature and volume of air in a tire

  Increases the pressure in the tire
• Position of a sandbag released from a rising balloon 1/4 seconds later is 1 foot
• Producing an image twice the size of the object


  Lens placed 8/3 m from the screen, focal length 5/3 m
• Diverging lens


  Thicker at the edges, parallel light rays appear to originate from the virtual focus
• Energy can neither be destroyed nor created, this is the law of conservation of energy
• Cross-linking


  Strong primary chemical bonds in some polymeric materials like epoxies
• Copolymer or interpolymer


  A large molecule with two alternating mers
• Steel


  An alloy of iron and carbon, with the carbon being restricted within certain concentration limits
• Deferred annuity


  Annuity where the first payment is made after several periods from the first period
• Annuity due


  Annuity where the payments are made at the start of each period, beginning from the first period
• Ordinary annuity


  Annuity where the payments are made at the end of each period, starting from the first period