Chapter 4 Problems 1‚ 2‚ 3 = straightforward‚ intermediate‚ challenging Section 4.1 The Position‚ Velocity‚ and Acceleration Vectors 1. A motorist drives south at 20.0 m/s for 3.00 min‚ then turns west and travels at 25.0 m/s for 2.00 min‚ and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.00-min trip‚ find (a) the total vector displacement‚ (b) the average speed‚ and (c) the average velocity. Let the positive x axis point east. 2. A golf ball is hit off a tee at the
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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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Abstract: In Rockets and Missiles combustion gas of an integral burning of a propellant flows along the duct of the propellant. If the nozzles attached to a rocket motor are removed‚ the pressure on the duct becomes equal to atmospheric pressure and no sonic velocity is attained at the rear end of the duct. Then no thrust generated by the combustion of the propellant. In nozzleless propulsion the mass burning rate of the propellant in the duct is increased and the flow reaches sonic velocity
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-Multistage rockets * Propelled by the recoil pressure of the burning gases it emits as it burns fuel * Most modern‚ high performance rockets are multistage * Multiple rockets stacked on top of each other that detach separately * Reasons for staging are * To improve performance by eliminating dead weight during flight * A huge‚ empty fuel tank is merely dead weight so it is dropped off to reduce weight later in flight * Maintain acceleration by reducing
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1 1 2 3 C Motion I 7 (a) From 1 January 2009 to 10 January 2009‚ the watch runs slower than the actual time by 9 minutes. Therefore‚ when the actual time is 2:00 pm on 10 January 2009‚ the time shown on the watch should be 1:51 pm on 10 January 2009. Practice 1.1 (p. 6) D (a) Possible percentage error 10 −6 = × 100% 24 × 3600 = 1.16 × 10 % 1 (b) = 1 000 000 days 10 −6 –9 It would take 1 000 000 days to be in error by 1 s. (b) Percentage error 9 = × 100% 9 × 24 × 60 = 6.94 × 10–2%
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121 9. EJECTION SEAT CAPABILITIES TO MEET AGILE AIRCRAFT REQUIREMENTS Larry Specker John Plaga Air Force Research Laboratory AFRL/HEPA 2800 Q Street‚ Bldg #824 Wright-Patterson AFB‚ OH 45433-7947‚ U.S.A. Vic Santi Aeronautical Systems Center ASC/ENFC 2530 Loop Road West Wright-Patterson AFB‚ OH 45433-5797‚ U.S.A. 9.1 BACKGROUND Current USAF seats provide safe aircrew escape up to about 425 Knots Equivalent AirSpeed (KEAS). The performance limit of US ejection seats is cited as 600
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.......................................................................... 3431 – 13 – Question 22 (5 marks) An astronaut on the Moon throws a stone from the top of a cliff. The stone hits the ground below 21.0 seconds later. The acceleration due to gravity on the moon is 1.6 ms–2. 150 m 300 m (a) Calculate the horizontal component of the stone’s initial velocity. Show your working. ..............................................................................................
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the ball‚ a javelin thrower‚ a discus thrower or a shot putter trying to throw their objects as far as they can (Sears‚ Zemansky and Young 54). In warfare‚ catapults and arrows in medieval times were the deadly weapons while today‚ guns‚ mortars‚ rockets and missiles have replaced those ancient weapons of war (“Field Artillery and Mortars”‚ “Ballistics”). However‚ the way to effectively use these weapons has not changed. They are to be launched into projectile motion to hit the target. The path followed
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Motion NCERT Chapter Questions and Answers and other Q & A Q1: An object has moved through a distance. Can it have zero displacement? If yes‚ support your answer with an example. Answer: Yes an object can have zero displacement even though it has moved through a distance. It happens when the object moves back to its original position i.e. final position coincides with the starting position. Example: Suppose an object travels from O to C and then comes back to original position O. Total
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How is Acceleration Affected by Mass and Gravity? Introduction How does force and mass affect acceleration? Newton’s second law states that the acceleration of an object depends on the net force acting on the object and the mass of the object. If more mass is applied to the car‚ then the acceleration will be slower. If there is less mass on the car‚ then the acceleration will be faster. If more force is applied to the car‚ then it will accelerate faster. If less force is used the car‚ then the
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