Physics question and answers for September 14, 2023
- Q A centrifuge rotor rotating at 9800 rpmrpm is shut off and iseventually brought uniformly to rest by a frictional torque of 2.22mâ‹…Nmâ‹…N .Part APlease Express your answer to three significantfigures.If...
- Q 2.00mole of nitrogen (N2) gas and 2.00mole of argon (Ar) gas arein separate, equal-sized, insulated containers at the sametemperature. The containers are then connected and the gases(assumed ideal) allowed to...
- Q An ideal gas with 7 degrees of freedom begins at a pressure of8.5 atm, temperature of 25 degrees Celsius and volume of 120L.A) How many moles of gas are there?B)...
- Q Cycling. For a touring bicyclist the dragcoefficient C1Æ’ = 1 CArv22 is 1.00, thefrontal area A is 0.463 m^2, and the coefficient ofrolling friction is 0.0045. The rider has mass...
- Q The resistanceless inductor is connected across the ac sourcewhose voltage amplitude is 29.0Vand angular frequency is 1000rad/s. Find the current amplitude if the self-inductance of the inductorisA) 1.00E^-2 H? (A)B)...
- Q What are the basic concepts of energy, entropy, temperatureand Balzmann Distribution. Use weight and most probabledistribution to connect them.
- Q A physics lecture room has a volume of 237 m3. (a) For a gaspressure of 1.00 atm and a temperature of 26.0 oC, use the idealgas law to estimate the...
- Q Compact fluorescent bulbs are much more efficient at producinglight than are ordinary incandescent bulbs. They initially costmuch more, but last far longer and use much less electricity.According to one study...
- Q 1. In each question: you place mass m on the mass holder, andreleased the system from rest. The system includes two pulleys anda long rod with two point masses on...
- Q If the resolution of a spectrograph is Delta lambda = 10^-12 m,would it be able to separate the K(alpha) lines of platinum andgold?
- Q A potential difference of 5.00 V will be applied to a47.00 m length of 18-gauge tungsten wire (diameter =0.0400 in). Calculate the current.Calculate the magnitude of the current density.Calculate the...
- Q Some time, delta T, after a rocket blasts off from the surfaceof earth, it is travelling at a constant speed, and itsinstantaneous mass(including fuel) is M+20,000kg. The gas ejectedout the...
- Q From the Apollo missions we know that the moon is covered withdust. Where does it come from? Is it from the erosion of the moonrock? By what? Or by accretion...
- Q What is the origin of the term laser?
- Q Throughout history, research in the physical sciences has oftenbeen limited by our abilitiesof safely observing and studying thevery phenomenon in question. As we make technological progress, wehave increasingly more tools...
- Q What physically causes energy to make subatomic particlesmove?I know energy causes particles to move \"kinetic energy\" and themeasure of kinetic energy is particles jiggling and colliding withone another giving temperature....
- Q The strength of the magnetic field within a solenoid is B = 3.9x 10-2 T (outside the solenoid B = 0). A smaller, single loop isplaced in the solenoid parallel...
- Q A coaxial cable has length d, inner wire radiusa and outer shell radius b. You can regard itscapacitance and inductance to be in series. If charge +qis placed on the...
- Q 2. You are an engineer trying to design a capacitor. You have aparallel-plate capacitor made of two circular metal plates. Theradius of each plate is 1 m and they are...
- Q 2. Planet Zero has a mass of 5.0 × 10^23 kg.a. If a stone is dropped near the surface of the planet andfalls 20 m in 2.19 s, what is...
- Q An object with mass 100 kg moved in outer space. When it was atlocation <11, -21, -7> its speed was 4.0 m/s. A singleconstant force <250, 330, -140> N acted...
- Q A satellite which has a weight of 35000 N on the surface of theearth is moving in a circular orbit around the earth. The radius ofthe orbit is 2R where...
- Q A pendulum of length 2.0 m is raised so that it maeks an angleof 43o with the vertical. The mass of the pendulum bobis 1.0 kg. It is released with...
- Q Compare and contrast the properties of open clusters and globularclusters. Indicate at least TWO way that they are similar? Indicateat least TWO way that they are different?
- Q 17. Draw a ray trace diagram showing the image location for a 5cm tall object placed 8 cm away from a converging lens that has afocal length of 10 cm....
- Q 1. Consider the following question:“A headlamp has one LED, takes three batteries, and has a switchthat toggles between different circuit configurations. What circuitconfiguration will get the brightest light from the...
- Q Graphical Analysis and Techniques ​ProcedureThe goal of this exercise is for you to determine therelationship and constant of proportionality between the radius andarea of a circle. You may already know...
- Q A ski jumper starts from rest from point A at the top of a hillthat is a height h1 above point B at the bottom of the hill. Theskier and...
- Q Starting at time t=0, net force F1 is applied to anobject that is initially at rest. If the force remains constantwith magnitude F1 while the object moves a distance d,the...
- Q A small space probe, of mass 240 kg, is launched from aspacecraft near Mars. It travels toward the surface of Mars, whereit will land. At a time 20.7 s after...
- Q Please show how calculus can be used in respect to measuring thechange of current or wave over a circuit. Please explain how theproblem works and what is happening at each...
- Q A uniform solid cylindrical log begins rolling without slippingdown a ramp that rises 15.0 ∘ above the horizontal. After it hasrolled 4.50 m along the ramp, what is the magnitude...
- Q 9. A cow is standing in a flat field, with its front legs at thedistance L from a lone tree. The cow is facing the tree, and theseparation between its...
- Q A catfish is 4.73 m below the surface of a smooth lake.(a) What is the diameter of the circle on the surface throughwhich the fish can see the world outside...
- Q Special relativity problemsa)A windowless spaceship falls freely to the ground along avertical path. The physicist observes two stationary objects insidethe spacecraft, which are at a distance of 1 m from...
- Q A heavy sled is being pulled by two people, as shown in thefigure. The coefficient of static friction between the sled and theground is μs=0.587 , and the kinetic friction...
- Q One car has twice the mass of a second car, but only half asmuch kinetic energy. When both cars increase their speed by 9.0 m/s, they then have the same...
- Q A point charge with charge q1q1 = +5.00 nC is fixed at theorigin. A second point charge with charge q2q2 = -6.00 nC islocated on the x axis at x...
- Q A fisherman and his young daughter are in a boat on a smallpond. Both are wearing life jackets. The daughter is holding alarge floating helium filled balloon by a string....
- Q I'm using this to study for an exam, please write out all stepsand include formulas, thank you!The world's fastest land animal, the cheetah, can accelerate at8.75 m/s2 to a top...
- Q An object is formed by attaching a uniform, thin rod with a massof mr = 7.1 kg and length L = 5.28 m to a uniform sphere with massms =...
- Q An object 2.87 cm high is placed 19.9 cm from a convex mirrorwith a focal length of 7.70 cm.(a) Find the position of the image.Your response differs from the correct...
- Q Show that Hermitian operators have real eigenvalues. Show thateigenvectors of aHermitian operator with unique eigenvalues are orthogonal. UseDirac notationfor this problem.
- Q A child hits an ice cube with a mass of 10 grams on a table witha force of 10 N. The impact lasts 0.02 seconds. The ice cube fliesoff the...
- Q A cooling fan is turned off when it is running at 900rev/min .It turns 1100 revolutions before it comes to a stop.Part B How long did it take the fan...
- Q An object is solid throughout. When the object is completelysubmerged in ethyl alcohol, its apparent weight is 15.9 N. Whencompletely submerged in water, its apparent weight is 13.4 N. Whatis...
- Q As our Sun ages, it will gothrough a period of collapse. If we take the maximum possibledensity of any material in the universe to be that of neutron starswhich have...
- Q Consider a person standing on a bathroom scale. Draw a free bodydiagram for the person and draw one for the scale. For each forceyou identified on the person name the...
- Q An ice cube of volume 15 cm3 is initially at thetemperature -20C . How much heat is required to convert this icecube into steam?
- Q (a) What drives current? (b) What impedes current? (c) How doesOhm’s Law relate these quantities?Why isn’t Ohm’s Law universally valid?What is the resistance of an automobile headlight through which3.50 A...
- Q why do you feel weightless in the International Spacestation?
- Q An airplane is flying at a constant horizontal velocity of 184.5m/s and drops a rocket. The rocket falls for 10.24 s without airresistance and under the influence of gravity only,...
- Q An older-model car accelerates from 0 to speed v in a timeinterval of ?t. A newer, more powerful sports car accelerates from0 to 2v in the same time period. Assuming...
- Q A monatomic ideal gas is contanined in a cylinder with amoveable piston. Initially the volume of the cylinder is 0.25m^3.The gas is compressed under a constant pressure of 3 Pa...
- Q An attacker at the base of a castle wall 3.75 m high throws arock straight up with speed 8.50 m/s from a height of 1.60 m abovethe ground.(a) what is...
- Q . A 0.56-kg ball is thrown vertically upward with an initialspeed of 15.5 m/s. What is the speed of the ball when it hastravelled one-half of the distance to its...
- Q A 0.408 kg pendulum bob passes through the lowest part of itspath at a speed of 2.71 m/s. What is the tension in the pendulumcable at this point if the...
- Q An electron beam moves toward a cathode ray tube screen, whichis 50 cm away from the negative electrode. The electrons areaccelerated by a potential difference of 18 kV. Estimate themaximum...
- Q Describe stress, strain, and elastic deformation, and giveexample
- Q You wish to make a model showing how traffic flows around yourcity or local area. Describe the steps you would take to constructyour model as well as some hypotheses that...
- Q You have a (copper) rod that is 702 mm at 20 C, you also have analuminum rod that has a length of 700 mm. When the rods are thesame length,...
- Q An inductor is connected to a 17 kHz oscillator that produces anrms voltage of 7.0 V . The peak current is 70 mA .What is the valueof the inductance L?...
- Q Could the spectral types of stars still be identified if therewere no elements other than hydrogen in their atmospheres?Explain.
- Q The maximum speed of a child on a swing is 5.90 m/s. The child’sheight above the ground is 0.790 m at the lowest point in hismotion. How high above the...
- Q A disk rotates with constant angular acceleration. The initialangular speed of the disk is 2? rad/s. After the disk rotatesthrough 20? radians, the angular speed is 3? rad/s. (a) What...
- Q How much total heat transfer is necessary to lower thetemperature of 0.275 kg of steam from 145.5 °C to −15.5 °C,including the energy for phase changes?total heat transfer:JHow much time...
- Q A 1,954-kg car is moving up a road with a slope (grade) of 39%while slowing down at a rate of 3.4 m/s^2. What is the directionand magnitude of the frictional...
- Q Explain, compare, and contrast the processes by which mainsequence stars generate light for low-mass stars (the proton-protonchain) and high-mass stars (the CNO cycle).
- Q In winter, people play hockey on Alta Lake in Whistler. However,it is not considered safe to by the Canadian Red Cross play hockeyon ice until the ice is 20 cm...
- Q Two 1.0 metric ton cars crash into each other. Both collidehead-on, and each was travelling 27 mi/hr when the collisionoccurred. The wreckage is at rest after the collision. How muchthermal...
- Q Discuss the meanings of the words \"potential\" and \"potentialdifference\". How are they similar and how are they different? Howdo these words fit in with the term \"voltage\"?This question was already...
- Q Briefly describe what a wavefunction is. Use the term “boundarycondition†in your answer. State 2 properties of wavefunctions.Give 2 examples of physical systems that would be described bywavefunctions.
- Q A fireworks rocket is moving at a speed of v = 45.7 m/s. Therocket suddenly breaks into two pieces of equal mass, which fly offwith velocities v1 at an angle...
- Q 1)  Two small, identical objects have charges of 6 μCand -3 μC. If the objects are 13 cm apart, what is the electricforce the objects exert on each other? (in N)-...
- Q The figure shows an initially stationary block of massm on a floor. A force of magnitude 0.500mg isthen applied at upward angle ? = 20
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