ࡱ> =?:;<B{ Nbjbjzz MnE?pdLmf:::dlflflflflflfl$/prl:6:::lm>>>:"(dl>:dl>>deX2rLi0PN[K<f(Plm0mfhwsK<HwsPLiLiws`i::>:::::ll=B:::m::::ws::::::::: : Name:__________________ Period:___ 2011-2012 Physics I Exam Review- 2nd Semester Momentum/Impulse/Collisions __B__ 1. An ice skater initially skating at a velocity of 3 m/s speeds up to a velocity of 5 m/s. The momentum of the skater ________. a.decreasesc.remains the sameb.increasesd.becomes zero __C__ 2. If a force is exerted on an object, which statement is true? a.A large force always produces a large change in the objects momentum.b.A large force produces a large change in the objects momentum only if the force is applied over a very short time interval.c.A small force applied over a long time interval can produce a large change in the objects momentum.d.A small force produces a large change in the objects momentum. __C__ 3. A constant impulse is applied to stop a moving shopping cart. Increasing the time interval over which the force is applied means that the stopping force is ________. a.greater c.smaller b.unaffectedd.the same  __D__ 4. A 0.06 kg tennis ball moves at a velocity of 12 m/s. The ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in the balls momentum? a.0.38 kgm/sc.1.1 kgm/sb.0.72 kgm/sd.1.8 kgm/sDiagram: (Given + Unknowns) m = .06 kg vf = -18 m/s vi = 12 m/s Equation: impulse = m (vf vi) Substitute: impulse = m (vf vi) Impulse = (.06kg)( -18 m/s - 12m/s) = - 1.8 kg m/s Solve: Impulse = - 1.8 kg m/s _C___ 5. The impulse experienced by a body is equivalent to the bodys change in ________. a.velocityc.momentumb.kinetic energyd.force _C___ 6. Which of the following are possible units for impulse? kg m/s c. Both A and B N s d. Neither A nor B _B___ 7. A 75 kg person walking around a corner bumps into an 80 kg person running around the same corner. The momentum of the 80 kg person ________. a.increasesc.remains the sameb.decreasesd.is conserved __A__ 8. Two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. Identify the type of collision. a.elasticc.Both A and B b.inelasticd.None of the above ___B_ 9. Two objects collide and move together as one object after the collision, only the total momentum was conserved. Identify the type of collision. a.elasticc.Both A and B b.inelasticd.None of the above __C__ 10. A swimmer with a mass of 75 kg dives off a raft with a mass of 500 kg. If the swimmers speed is 4 m/s immediately after leaving the raft, what is the speed of the raft? a.0.2 m/sc.0.6 m/sb.0.5 m/sd.4.0 m/sDiagram: (Given + Unknowns)  Before After ( % + % ( m1 = 75 kg v1 f = 4 m/s v i = 0 m/s m2 = 500 kg v2 f = ??? m/s In recoil, one object goes one direction while the other object goes the other direction. Newtons 3rd law for every action there is equal and opposite reaction Equation: (m1+ m2) vi = m1v1 f + m2v2 f Substitute: (75 kg + 500 kg)(0 m/s) = (75 kg)(4.m/s) + (500kg)(vf) 0 = 300 + 500vf -300 = 500vf -0.6 m/s = vf Note: speed is a scalar so our sign is ignored in the final answer.Solve: 0.6 m/s = vf __A__ 11. A 4.0 kg bowling ball sliding to the right at 10.0 m/s has an elastic head-on collision with another 5.0 kg bowling ball initially at rest. The first bowling ball stops after the collision. Find the velocity of the second ball after the collision. a.8.0 m/sc .35.0 m/sb.10.0 m/sd.40.0 m/sDiagram: (Given + Unknowns) Before After % ( + % % + % ?? m1 = 4 kg v1 I = 10 m/s v2 f = 0 m/s m2 = 5 kg v2 I = 0 m/s v2 f = ?? m/sEquation: m1v1 i + m2v2 i = m1v1 f + m2v2 fSubstitute: (4 kg)(10m/s) + (5kg)(0 m/s) = (4 kg)(0 m/s) + (5kg)vf 40 + 0 = 0 + 5vf 40 = 5vf 8 m/s = vf Solve: 8 m/s = vf __B__ 12. The impulse of 150 Ns is applied to a 10 kg object, what is the change of momentum on the object? 15 kg m/s b. 150 kg m/s c. 1500 kg m/s d. 100 kg m/s. SHM and WAVES 13. When a wave crosses a boundary between a string and a rope, which wave properties are changed? (velocity, wavelength and or frequency) velocity and wavelength Which property is not changed? frequency 14. When a wave passes from one medium to another and bends, what is this called? refraction 15. The diagram below shows what wave interaction? refraction  INCLUDEPICTURE "http://t1.gstatic.com/images?q=tbn:ANd9GcSzlAO9pT4xn0U0oAvy6f9SE2qVGsjug0dmtmrQyas4GdG1l3SnEdTwknGXSA" \* MERGEFORMATINET    normal Less Optically DenseMore Optically Dense 16 a. An incidence light ray (the arrow) is being refracted from more optically dense medium to a less optically dense medium. On the picture to the right, draw a normal line and draw an approximate refracted ray. 16 b. Does the refracted ray bend further or closer to the normal than the incident ray. The ray bends further from normal. 16 c. When compared to the incidence light ray, is the reflected light ray moving faster or slower than the incidence ray? It moves faster.    normal   Less Optically Dense More Optically Dense 17 a. An incident light ray (the arrow) is being refracted from less optically dense medium to a more optically dense medium. On the picture to the right, draw a normal line and draw an approximate refracted ray. 17 b. Does the refracted ray bend further or closer to the normal than the incident ray. The ray bends closer to normal. 17 c. When compared to the incidence light ray, is the reflected light ray moving faster or slower than the incidence ray? It moves slower.  18. When a wave hits a boundary and bounces off, what is this called? reflection You send continuous waves along a string of fixed length. As you decrease frequency, you increase (increase or decrease) wavelength l. ( so how are frequency and wavelength related? inversely For a TRANSVERSE wave, is the movement of particles Parallel or Perpendicular to the direction of wave propagation? perpendicular For a LONGITUDINAL wave, is the movement of particles Parallel or Perpendicular to the direction of wave propagation? parallel When a wave hits a FIXED end, like a wall, and is reflected, will it experience a PHASE change? YES YES YES When a wave hits a FREE end and is reflected, will it experience a PHASE change? NO On the diagram of the wave, please label the AMPLITUDE, CREST, TROUGH, EQUILIBRIUM, WAVELENGTH   What is the primary difference between a Mechanical Wave and an Electromagnetic Wave? Mechanical wave require a medium while electromagnetic wave do not necessarily need a medium. Give one example of a mechanical wave. sound Give one example of a electromagnetic wave. light An ocean wave has a wavelength of 10 m. A wave passes a fixed location every 2.0 s. What is the speed of the wave? Diagram: (Given + Unknowns) v = ??? m/s d = 10 m t = 2sEquation: v = d / tSubstitute: v = 10 m / 2 s Solve: v = 5 m/s List three examples of simple harmonic motion. Pendulum, mass bobbing up and down on a spring, skateboard going back and forth up and down a bowl When two waves of opposite (crest and trough) amplitudes superpose, the result is called destructive interference. (constructive or destructive) A simple pendulum swings in simple harmonic motion. At maximum displacement, describe the velocity, acceleration, and force. (max or zero) Velocity zero Acceleration max Force max Echoes are examples of reflection of sound waves. Sound waves are longitudinal as well as mechanical waves. A detected change in the frequency of a sound due to a moving source or a moving observer is called the Doppler effect. Define ultrasonic. Define infrasonic. Ultrasonic-- frequencies above human hearing infrasonic -- frequencies below human hearing A sound wave travels at 4500.0 m/s through a steel rod. What is the wavelength if its frequency is 2500.0 Hz? Diagram: (Given + Unknowns) v = 4500 m/s  = ???? m f = 2500 HzEquation: v = fSubstitute: 4500 m/s =  (2500 Hz)Solve: 1.8 m =  Draw 2 uneven pulses, on the same side of a Slinky, before, during, and after superposition. Before During  After  Draw 2 even pulses, on opposite sides of a Slinky, before, during and after superposition. Before During  After  LIGHT Label each letter in the diagram. (normal, incident ray, angle of incidence, reflected ray, angle of reflection) AAngle of incidenceBAngle of reflectionCIncident rayDReflected rayENormal  All electromagnetic waves move at 3.0 x 108 m/s in a vacuum. The fact that light can be polarized shows that light waves are transverse waves. The bending of light waves from the sun as they pass through our atmosphere is an example of refraction. All angles are measure with respect to the normal at all times. The ability of waves to spread around or through a barrier is called diffraction (reflection, refraction, or diffraction) Draw a ray diagram for each of the following convex lenses. Please classify each Image as Real/Virtual, Reduced/Englarged, Upright/Inverted. Real, inverted, reduced  Draw a ray diagram for each of the following convex lenses. Please classify each Image as Real/Virtual, Reduced/Englarged, Upright/Inverted.  Virtual, upright, enlarged   Converging lens are (thinner/thicker) thicker across its center than across its edges. (Real/Virtual) Real images can be projected onto upon a screen while (Real/Virtual) Virtual images can not be projected on a screen. If a light ray travels from a more optically dense substance to a less optically dense substance, the light ray will (speed up/slow down) (circle one). If a light ray travels from a more optically dense substance to a less optically dense substance, the light ray will (bend toward the normal/bend away from the normal) (circle one). CHARGE and ELECTRICTY What is an electrical conductor? An object which allows charges (usually electrons) to move through it. What is an electrical insulator? An object that prevent the motion of charge If a suspended object is attracted to another object which has a charge, what can you conclude? (2 things) at least one object is charged, and they are not both the same charge. How does the electric force between two charges change when the distance between them is doubled? (does it increase or decrease) It decreases (by a factor of four actually) How does the electrical force between two charges change when the charge of particle is tripled? (does it increase or decrease) It Increases. (By a factor of three actually) What is the charge of a proton? +1 where is it located? In the nucleus What is the charge of a neutron? 0 where is it located? In the nucleus What is the charge of an electron? -1 where is it located? In the electron cloud or the orbital If an ion of Ca+2 has a charge of +2,does it have more protons or electrons? More protons Can you gain or lose protons? NO!!!!!!!! unless you are doing a nuclear reaction Can you gain or lose electrons? Yes, those are chemical reactions The rate of flow of electric charge, is the current. Resistance is defined as opposition to charge movement. If the length of the wire is doubled, will the amount of resistance increase or decrease? Resistance increases If the diameter of a wire is doubled, will the amount of resistance increase or decrease? Resistance decreases An ammeter registers 4.5 A of current in a wire that is connected to a 9.0 V battery. What is the wires resistance? Diagram: (Given + Unknowns) Vtotal = 9 V Itotal =4.5 A Rtotal = ??  Equation: V = IR Substitute: 9 = (4.5) R Solve: R = 2 What is the equivalent resistance of a series circuit with resistors of 7 &!, 13 &!, and 20&!? Rtotal = R1 + R2 + R3 = 40  What is the equivalent resistance of a parallel circuit with resistors of 7 &!, 13 &!, and 20&!? Diagram: (Given + Unknowns) Rtotal = ??? R1 = 7  R2 = 13 R3 = 20 Equation: 1/ Rtotal = 1/ R1 + 1 /R2 + 1 / R3Substitute: 1 = 1 + 1 + 1 1 = .1428 + .0769 + .05 Rtotal R1 R2 R3 Rtotal 1 = 1 + 1 1 1 = .2697 (DO A SWITCHAROO) Rtotal 7 13 20 Rtotal 1 = Rtotal .2697 Solve: Rtotal = 3.7  If you add more resistors in series, does your total resistance increase or decrease? Total resistance increases So, does your current drawn from the battery increase or decrease? 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Current increases An electric heater is operated by applying a potential difference of 50.0 V across a nichrome wire of total resistance 4.00 &!. What is the power rating of the heater? Diagram: (Given + Unknowns) V = 50 V I =??? A R = 4  P = ???? W Equation: V = IR P = IVSubstitute: I = V / R = 50 / 4 = 12.5 A P = IV = (12.5)(50) =625 W Solve: P = 625 W Fill in the blanks in the chart. DEVICE PRI"VComputer 214 W95 &!1.5 A142 VPortable Stereo 15.0 W0.167 15 A2.5 VCoffee Maker 500.0 W14 6.0 A83 VGraphing Calculator 0.126 W198 .0252 AV MAGNETS When allowed to float freely, the North pole of a bar magnet points Geographic north toward a region in Canada because it is attracted to magnetic south. The force experienced when the N-poles of two magnets are brought close together is what type of force? (attractive or repulsive) repulsive If a bar magnet is broken into two pieces, how many poles does each magnet have? two Is the magnetic field surrounding a current-carrying wire strongest closest to the wire or far from the wire? Probably near the poles and we usually describe a current carrying wire as having poles. The field surrounds the wire in a circle which has a direction but no ends In the diagram below, the magnet labeled as #2 would have its N pole facing what direction? 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