Physics question and answers for July 27, 2023
- Q Question 1: Explain the statements below :A) Design a hypothetical change that provides the first law ofthermodymability but is contrary to the second law.b) Design a hypothetical change that provides...
- Q From t = 0 to t = 3.90 min, a man standsstill, and from t = 3.90 min to t = 7.80 min, hewalks briskly in a straight line at...
- Q True/False:A machine’s efficiency can be over 100%.The rotational inertia of a body increases when the distance ofits mass from the rotation axis increases.The Leaning Tower of Pisa is in stable...
- Q An electron is accelerated horizontally from rest by a potentialdifference of 2100 V . It then passes between two horizontal plates6.5 cm long and 1.3 cm apart that have a potential difference...
- Q Your percentage of body fat by weight is an important indicatorof your general physical condition. For people in good health itshould be between 10 and 15%. One way of determining...
- Q Suppose you have a system with four levels,Ej (j=0, 1, 2, 3), with energies of(in units of kB·K) 0, 100, 200, 400.Explicitly, if, for example Ej = 100, whenT=300, Ej/kT...
- Q A hollow sphere of mass M and radius R is hit by a pendulum ofmass m and length L that is raised at an angle θ. After thecollision the pendulum...
- Q After an electron undergoes a n to π2 or πto π2 transition, what are three ways we discussed itwill “relax†or “lose this excess energy�And what determines if a transition...
- Q 1. Calculate the probability of locating an electron in aone-dimensional box of length 2.00 nm and nx=4 between 0and 0.286 nm. The probability is also plotted. You should compare(qualitatively) your...
- Q Calculate the moments of inertia (about any axis through thecenter) for a spherical shell and a solid sphere. What is the ratiobetween the two moments of inertia. Both spherical shell...
- Q A dose of 3000cGy is delivered to a depth of 8cm where thepercent depth dose is 76%. What is the dose to an underlying organat 14cm depth where the percent...
- Q A 0.5-kg mass is attached to a spring with spring constant 2.5N/m. The spring experiences friction, which acts as a forceopposite and proportional to the velocity, with magnitude 2 N...
- Q Oil efficiency and national security. Right now, the UnitedStates is extremely dependent on oil for its automobile. Ourdependence on oil has turned the Middle East into one of the mostimportant...
- Q You can determine the index of refraction of a substance bydetermining its critical angle. (a) What is the index of refractionof a substance that has a critical angle of 32Ëš...
- Q A ladder having a uniform density and a mass m restsagainst a frictionless vertical wall, making angle 48.0° with thehorizontal. The lower end rests on a flat surface where thecoefficient...
- Q - List three differences between the Sun’s core and thephotosphere.- Describe how sunspots are produced.- Summarize in words the three steps in the proton-proton chain.Explain why energy is produced when...
- Q Why do the voltage and current in the pickup coil cycle betweennegative and positive? Explain in detail using Faraday’s Law.Remember, Lenz’s Law is part of Faraday’s Law! Although it will...
- Q Gamma Ray AbsorptionA gamma ray with energy E, hits a stationary nucleus of mass Mand is completely absorbed. In terms of E, and M, find expressionsfor the following quantities.a. The...
- Q At time t = 9 sec, a particle of mass M = 3 kg is atthe position (x,y,z) = (4,4,6) m and has velocity (2,1,-2) m/s.1) What is the x...
- Q What is the magnitude of the electric field at a point midwaybetween a −6.5μC and a +5.0μC charge 10cm apart? Assume no othercharges are nearby. Express your answer using two...
- Q There are two identical, positively charged conducting spheresfixed in space. The spheres are 34.8 cm apart (center to center)and repel each other with an electrostatic force of ?1=0.0765 N ....
- Q View the video \"The Apple and the Moon,\" video 8from  The Mechanical Universe and Beyond. In your ownwords describe Newton's three laws of motion. Give an example thatillustrates each law. What...
- Q A trucking moving at 25m/s emits a 400-Hz signal. Thetemperature that day is 40 o C.a) Determine the speed of sound at 40o CDetermine the frequency and the wavelength experience...
- Q A cubical block of wood 0.100 m on a side and with density of550 kg/m3 floats in a jar of water. Oil with a density of 750 kg/m3is poured on...
- Q 1) With static materials, What happens when you bring eachcharged plastic strip near the paper pieces? Why does thishappen?2)Draw a free body diagram of the forces acting on the piece...
- Q An open container holds ice of mass 0.575kg at a temperature of-12.2?C . The mass of the container can be ignored. Heat issupplied to the container at the constant rate...
- Q A particle of diameter 0.2 μmand density 1 g cm-3is beingcarried by an airstream at 1 atm and 298 K in they direction with avelocity of 100 cm s-1. The...
- Q Explain, in details, why it is more difficult to observeinterference pattern under sunlight than light from a sodiumlamp.
- Q A submarine is stranded on the bottom of the oceanwithitshatch25.0mbelowthesurface.Calculatetheforce needed to openthe hatch from the inside ,given it is circular of 3.00×105 N/m2.(a) The water enters a hose with...
- Q A driver in a moving car applies the brakes. The car slows to afinal speed of 1.50 m/s over a distance of 40.0 m and a timeinterval of 9.00 s....
- Q What are the types of radiation that form the x-ray energyspectrum?
- Q A block with a mass of 2.5kg lies on a surface that is inclinedat an angle of, θ=22 , with the horizontal. The coefficient offriction between the block and the...
- Q What is the recommended way to decrease airspeed while flying inthe region of reverse command?Increase DragDecrease ThrustIncrease Angle of AttackPitch nose down
- Q Problem 1: The energy E of a particle of mass m moving at speedv is given by: E2 = m2 c4 + p2 c2 (1) p=γmv (2) 1 γ =...
- Q 1. A force of 99N is applied to a 26kg lawnmower at an downwardangle of 25 degrees relative to the horizontal. There isessentially no friction due to the wheels. Find...
- Q Two cannons are each loaded with one cannonball. One cannonballhas twice the mass, but is fired from has a barrel that is twicethe length of the other. Which cannonball, if...
- Q Measuring Current and Voltage:Make a circuit consist of a battery and a bulb. Measureand record the voltage across the bulb and the current through thebulb. Now attach another bulb in...
- Q Briefly explain why a centrifuge will be needed in order tocollect the nanoparticles when using a solution-phase method tosynthesize nanoparticles. (Think about gravitational force howcentrifuge affects “gâ€)
- Q why is the graph of the force vs position not uniform
- Q With the aid of a diagram, explain how “one way mirror worksâ€and how can be improved. Â
- Q A 10.0kg uniform ladder that is 2.50m long is placedagainst a smooth (frictionless) vertical wall and reaches to aheight of 2.10m. The angle between the floor and the ladder is...
- Q A 133-kg horizontal platform is a uniform disk of radius 1.51 mand can rotate about the vertical axis through its center. A66.5-kg person stands on the platform at a distance...
- Q 1) A ball is kickedfrom the top of a bridge at a height of 50 m(measured from the surface of the water below) with an initialspeed of 30 [m/s] at...
- Q Explain how the balance of attractive and repulsive forces inthe nucleus is affected by the contents of the nucleus and thelocations of those contents
- Q How do we get two lines of interference pattern in theexperiment of finding the wavelength of monochromatic light using aLloyd's mirror?Please explain with the help of a diagram. Also tellwhy...
- Q Pick an appropriate scale and graphically add these vectors, inorder: A = 30 m/s at 30o North of East, B = 20 m/s South, C = 50m/s at 70o West...
- Q Make Excel do all of the necessary calculationsReport answers on the worksheetLabel answers as the questions are labelled: a, b, c,…Use the probability notation p(A), p(Aand B),… etcSubmit your spreadsheet...
- Q how do you draw initial and final states on a PVT surface?
- Q A heat pump is used to heat a house with an indoor temperatureof 21 â—¦C. Assume the outdoor temperature is -9 â—¦C. What is themaximal energy that could be delivered...
- Q A satellite of mass 2.00 x 104 kg is placed in orbitaround Jupiter. The mass of Jupiter is 1.90 x 1027 kg.The distance between the satellite and the centre of...
- Q A particle travels at 0.14c. By what percentage will acalculation of its momentum be wrong if you use the classicalformula?Express your answer using two significant figures.p−prelprel = ? %B- Repeat...
- Q What is the ratio of cost of a “typical†sonogram vs. MRI forthe same region (head, chest, etc.)?What is sonography— what kind of image does it create andhow?What are two...
- Q A mass of 0.30 kg is attached to a spring and set intooscillation on a horizontal frictionless surface. The simpleharmonic motion of the mass is described by x(t) = (0.48...
- Q Water at a gauge pressure of P P = 3.2 atm a t m at street levelflows into an office building at a speed of 0.78 m/s m / s...
- Q An audio amplfier drives a series RLC circuit consisting of an8.0 Ω loudspeaker, a C = 42 × 10−10F capacitor, and a L = 60 × 10−6H inductor. The amplifier...
- Q On a guitar, the lowest toned string is usually strung to the Enote, which produces sound at 82.4 Hz. The diameter of E guitarstrings is typically 0.0500 in and the...
- Q *Relativity and time - 1The distance between New York and Los Angeles is about 5,000 km.A jet, traveling at a speed of 769 km/hour, leaves New York.Calculate the time elapse...
- Q Please post your answers and replies to the discussionquestions belowWhat is the difference between speed and velocity?What is acceleration?Name 3 ways that velocity can change?List three units that you might...
- Q after falling from rest from a height of 30 m, a 0.50kg ball rebounds upward, reaching a height of 20 m. if the contactbetween bam and ground lasted 2.0 ms,...
- Q An AC generator supplies an rms voltage of 230 V at 60.0 Hz. Itis connected in series with a 0.300 H inductor, a 4.30 μF capacitorand a 256 Ω resistor.What...
- Q How do you use errors in mass and velocity to find the errors instarting and ending kinetic energy?Equation for KE = 1/2mv^2Error in m = 0.179kg +/- 0.005 kgError in...
- Q Venus has an average temperature of460? C. What fraction of CO2molecules are moving faster than 750m/s? What percentage of themolecules are moving faster than theescape velocity of 10.4 km/s? (Thiswill...
- Q Describe a method by which you can independently verify theuncertainty on your force measurements for the Acceleration of aCart lab.\Describe a method by which you can independently verify theuncertainty on...
- Q At the x = 0 end of an semi-infinite rope, someone moves the endof the rope up and down sinusoidally as y[x = 0, t] = A Cos[ω t +π/4]:...
- Q Classic footage of the Apollo 11 astronauts show them takinglarge leaps bounding around the surface of the moon. Bytransporting this simple spring and mass system to the moon, we canmeasure...
- Q QUESTION 9Tony Hawk is skating through a half-pipe with a radius of 4 m.Initially he is in a crouched position with his center of mass 0.5m above the surface of...
- Q A simple pendulum, 2.0 m in length, is released by a push whenthe support string is at an angle of 25° from the vertical. If theinitial speed of the suspended...
- Q A playground is on the flat roof of a city school, hb = 5.40 mabove the street below (see figure). The vertical wall of thebuilding is h = 6.60 m...
- Q You are driving your car, and the traffic light ahead turns red.You apply the brakes for 2.73 s, and the velocity of the cardecreases to + 5.37 m/s. The car’s...
- Q A shell is fired from a gun at an angle of 30 degrees to thehorizon. The initial velocity of the shell is 10 m/s. What velocitywill this shell have at...
- Q What is the difference between random error and systematicerrors ? How do you correct each one ?
- Q 1) Jason Statham jumps off of a diving board which is 3.0 mabove the water surface. He lands traveling at 8.90 m/s at an angleof 75° with respect to the...
- Q A particle moves under constant external force F = F0ˆi. It is also subjected to a drag force, FD =−CDV. How will the particle move, qualitativelyspeaking? Describe in words before...
- Q Q1. What are the Dulong-Petit law and Einstein modelfor the heat capacity of solids?
- Q FLUID DYNAMICS:Explain the method of assigning temporal and spatialscales to physical phenomena in fluid dynamics.
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