Physical Science 101 Exam III, Exams of Physical Education and Motor Learning

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Exam III Physical Science 101 April 6, 1998 Form 2 Relations/Equations velocity:(distance traveled)/time interval (+direction) u : dlt acceleration-(change in velocity)/(time interval) a : Lu I Lt; L,u : aLt gravitational acceleration (on earth's surface) g : !\mls2 free-fall distance d:Il2gtz Net Force--massxacceleration F -- ma momentum:mass x velocity momentum: rn:) impulse:Force x (time interval):change in momentum Impulse:Ft: L(mu) kinetic energy KB:ll2mu2 Work:Net Forcex distance: kinetic energy W : Fd:1l2mu2 gravitational PE : weight x height PEo,or.:mgh Universai law of Gravitation F : Gmtmzl& pressure:Force/Area density:Pass/volume Archimedes' Principie: Buoyant Force:lVeight of displaced fluid heat transferred:mass x specific heat x (change in temperature) Coulomb's law F : kqrqz ld2 Electric Potential Energy : Chargex Voltage PE"l".. : QV' Electric Current : Charge/time Ohm's Law: Current : Voltage/Resistance I :VlR Power:Curreht x Voltage P:IV Faraday's law: induced voltage in coil - S loops x rate at which mag. field changes with time within loops waves: wave speed:wavelength xfrequency visible light (increasing in frequency): Red Orange Yellow Green Blue Indigo Vioiet light energy: Energy - frequency atomicshellmodel: shellS:1 2 3 4 5-6 7 max.'f electrons: 2 8 8 18 18 32 32 qt [1] Electromagnetic waves consist of [A] high-frequency gravitational waves. [B] compressions and rarefactions of electromagnetic pulses. [C] particles of light energy. [D] oscillating electric and magnetic fields. [2] Nlicrowave communications (e.g. earth-satellite transmissions, cellular) require high frequency filters and other devices that currently make extensive use of [A] magnetic materials. [B] superconducting materials. [C] lasers. 'l [D] radioactive decay. [3] The colors of birds like ducks and hummingbirds are not caused by pigmentation, but rather by [A] dispersion and refraction; the same phenomena that make colors from white light transmitted through a prism. [B] interference of light reflected from overlapping feathers. [C] the absorption of certain colors by the feathers. [D] none of these. [4] About how many elements are known to exist? [A] 1oo. [B] 2oo. [c] 25. [D] 50. [5] When beams of either photons or electrons are sent through two narrow, closely spaced slits, an inter- ference pattern results. This shows that, [A] light is a wave, and particles never act Iike waves. [B] particles are really waves, and light is not a wave. [C] particles of matter and light never act like waves. [D] both particles of matter and Iight c"an behave like waves. [6] The main reason semiconductors are so useful in electronic devices is [A] their electrical conduction is superior to other materials. [B] they are unaffected by magnetic fields. [C] their electrical properties can be altered controllably by doping with impurity atoms . [D] their electrical resistance is independent of temperature. [7] As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The wave crests are 2 meters apart. lVhat is the speed of the wave? [A] 0.25mls [B] 0.5m/s [C] lm/s [D] 2mls [E] a m/s [8] lVhen a light beam emerges from water into air, the average light speed [A] increases tB] decreases tC] stays the same. [9] The Tacoma Narrows bridge collapsd seen in a classroom film (and on TV in a recent advertisement) is an example of [A] an echo. [B] sound refraction. [C] resonance. [D] interference. Exam I Physical Science 101 February 9, 1998 Form 2 ' Relations/Equations velocity:(distance traveled)/time inten'al (+direction) u : dlt acceleration-(change in velocity)/(time interval) a : Lu /Lt; L,u : aLt ' gravitational acceleration (on earth's surface) g : tAmls2 free-fall distance d:1l2gt2 Net Force:massxacceleration F:rna momentum:mass x velocity momentum: rnt) impulse:Force x (time interval):change in momentum Impulse:Ft: L(mu) kinetic energy KB:t/2mu2 Work:Net Forcex distance: kinetic energy W : Fd:7l2mu2 gravitational PE : weight x height PBs,ou.:mgh Universal law of Gravitation F : Gmrmzld2 pressure:Force/Area density:mass/volume Archimedes' Principle: Buoyant Force:Weight of displaced fluid heat transferred:mass x specific heat x (change in temperature) 33 [1] You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentuin? [A] the bug. [B] your car. [C] both the same. [2] Airplane flight is possible because <if a net force that pushes upward on the wings of a moving plane. This arises primarily from . [A] buoyancy of the plane in the air.' [B] the reaction force of the air pushing on the wings. ' ' [C] increased airspeed and reduced pressure above the wing. lDl dll of these. [E] none of these. [3] A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that [A] the milk carton has no acceleration. [B] there is an action-reaction pair of forces. [C] gravity tends to hold the milk carton secure. [D] the milk carton has inertia. lE] none of these. [4] A feather and a coin will huu. "qual accelerations when falling in a vacuum because [A] their velocities are the same. [B] the force of gravity is the same for each in vacuum. [C] the force of gravity does not act in vacuum. [D] the ratio of each object's weight to its mdss is the same. [E] none of these. [5] An elephant and a feather fall from a tree thi'ough the air to the ground below. The force due to air-resistance is greater on the lA] elephant IB] feather. [C] is the same on each. [6] A ball is thrown vertically upward and comes back dowl. Its acceleration on the way up is [A] Iess than when it is falling back down. [B] zero when it reaches the highest point in its motion. [C] the same as when it is falling back down. [D] greater than when it is falling back down. [7] A large block of wood and a small block of iron on weighing scales both register the same weight - 1 , ton. Taking buoyancy into account, which has the greater mass?' [A] wood. [B] iion. [C] both have the same mass. [8] Two objects move toward each other because of gravity. As the objects get closer and closer, the acceltiration of each [A] increases. ' [B] decreases [C] remains constant. [9] Energy from thb sun is transferred to the earth by [A] conduction. [B] convection. [C] radiation. [D] all of these. [10] Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a greater [A] speed' [B] acceleration. [C] momentum. [D] all of these. [E] none of these. [11] The main reason ocean tides exist is that the pull of the moon [A] and sun are in conjunction at high tides.and in opposition at low tides. [B] is greater on oceans closer to the moon and less on oceans farther from the moon. [C] is greater on the earth because the moon is closer to earth. [D] and the sun on the oceans are in opposite directions. [E] none of these. 112] Atmospheric pressure is about 100,000N per square meter.. This translates into a force of 1,000,000N on a 1O-square-meter picture window. Why don't such windows break under this force? [A] Glass actually has microscopic holes that transfer the pressure and reduce the force substantially. [B] The difference in the forces on either side of the window is much smaller than 1,000,000N. lC] Glass is engineered to withstand such "everyday" forces. [13] The temperature of a gas is a measure of the [A] average separation of its molecules. [B] mass of its molecules. [C] diameter of its molecules. [D] average kinetic energy of its molecules. [E] average force per area delivered by its molecules. [14] Breezes at the seashore tend to blow in from the sea during the day and out to sea at night. This occurs because water and soil (or sand) have different [A] thermal conductivities.' [B] thermal energies. [C] masses. [DJ specific heats. [15] Newspaper wrapped tightly around a metal bar will not set fire because [A] the metal is a good thermal conductor. [B] the paper is a poor thermal conductor. [C] the metal has a high specific heat capacity. [D] none of these. [16] Baseball A is thrown horizontally and baseball B is thrown straight upward. Once they leave the pitcher's hand, [A] ball A has the greater acceleration. [B] ball B has the greater acceleration. [C] neither is accelerating. [D] they both have the same acceleration.