Physics question and answers for September 06, 2023
- Q A +15.00 nC point charge with a mass of 4.00 g is placed 25.0 cmfrom the surface of a solid conducting sphere having a radius of125 cm and a net...
- Q How can you use the Hydrogen 21-cm line transition to measurethe rotation curve of a galaxy?
- Q Two capacitors, C1=7500pF and C2=2900pF, are connected in seriesto a 15.0 V battery. The capacitors are later disconnected from thebattery and connected directly to each other, positive plate topositive plate,...
- Q Light including the infrared, visible, and ultraviolet hits abunch of hydrogen atoms at nearly 0K. The light is detected afterhitting the atoms.Describe the detected light.Considering only transitions that allow the...
- Q A block of mass m = 2.5 kg is attached to a spring withspring constant k = 640 N/m. It is initially at rest on aninclined plane that is at...
- Q A. If the electric field E is zero at a given point, must theelectric potential V also equal zero at that point? Explain yourreasoning and give an example to prove...
- Q A 1.71 kg ball and a 3.27 kg ball are connected by a 1.76 m longrigid, massless rod. The rod is rotating clockwise about its centerof mass at 24 rpm....
- Q Particle X has a speed of 0.850 c anda momentum of 8.61×10-19kgm/s. What is the mass of theparticle?What is the rest energy of the particle?What is the kinetic energy of...
- Q Suppose a 10.0 kg fireworks shell is shot into the air with aninitial velocity of 69.0 m/s at an angle of 80.0° above thehorizontal. At the highest point of its...
- Q a) What is the speed of a beam of electrons that go undeflectedwhen passing through crossed electric and magnetic fields ofmagnitude 1.39x104 V/m and 2.92x10-3 T,respectively? Give your answer to...
- Q A ï¬sherman notices that his boat is moving up and downperiodically, owing to waves on the surface of the water. It takes2.5 s for the boat to travel from its...
- Q What is the new charge density on the outside of thesphere?   Calculate the strength of the electricfield just outside the sphere? What is the electric flux through aspherical surface just inside...
- Q A small object moves along the xx-axis with accelerationax(t)ax(t) = −(0.0320m/s3)(15.0s−t)−(0.0320m/s3)(15.0s−t). At tt =0 the object is at xx = -14.0 mm and has velocity v0xv0x = 8.70m/sm/s.What is the...
- Q A mass m slides down a frictionlessramp and approaches a frictionless loop with radiusR. There is a section of the track(between the ramp and the loop) with length2R that has...
- Q In an experiment on the photoelectric effect, a beam ofmonochromatic light is aimed at a nickel-plated cathode. Ascientist uses mathematical formulas to calculate the maximum speedof the electrons that the...
- Q Parasitic power theft:A power line running East-West at 150kVAC carrying a 75MWatt load is 10 meters overhead. A thief makes a 100 turn loop ofinsulated copper wire around a plastic...
- Q A 100 g lead ball at a temperature of 100â—¦C isimmersed in 300 g of water with the temperature 20â—¦C contained inan insulated boiler whose heat capacity can be neglected....
- Q A typical American household uses 26.5 kW-hour of electricityper day, and that electricity is mostly supplied by fossil fuels.If we wanted to instead power a house by solar panels, whichreceive...
- Q Suppose that a molecular ion with charge -10e isembedded within the 5.0-nm-thick cell membrane of a cell withmembrane potential -70 mV.What is the electric force on the molecule?
- Q Why can’t the human body sense magnetic fields in our bodieswhen neurons “fireâ€
- Q One of the harmonic frequencies of tube A with two openends is 836 Hz. The next-highest harmonic frequency is 912 Hz.(a) What harmonic frequency is next highest afterthe harmonic frequency...
- Q Summarizing metaphysics in film. Provide a summary and explainthe metaphysical concepts found in the film, the Sixth Sense.
- Q 1 For the following questions consider a compound of calcium andchlorine.a What type of bond do calcium and chlorine form?b Describe how this bond forms.c What is the chemical formula...
- Q Why do astronomers think there are two basically different typesof gamma-ray burst?
- Q 1.A 15 pF capacitor is charged to 1 kV andthen removed from the battery and connectedin parallel to an uncharged 65 pF capacitor.What is the new charge on the second...
- Q A tube at room temperature which is 0.680 m long is open on bothends. Which frequencies of sound will resonate in the tube?The tube is then covered on one end....
- Q You plan to take a trip to the moon. Since you do not have atraditional spaceship with rockets, you will need to leave theearth with enough speed to make it...
- Q A wave in a string has a wave function given by: y (x, t) =(0.0300m) sin [(5.35 m^-1) x + (1.63 s^-1) t]Â Â where t is expressed in seconds and x...
- Q A 5.00-MΩ Ω resistor and a 5.00-μ μ F capacitor are connected inseries with a power supply. 1) What is the time constant for thecircuitPart B A 20.0-μ μ F...
- Q With axle and spokes of negligible mass and a thin rim, acertain bicycle wheel has a radius of 0.350 m and weighs 33.0 N; itcan turn on its axle with...
- Q The Doppler effect - the shift in frequency/wavelength of asound source when there is relative motion between source &observer - and a Sonic Boom - a conical region of compression...
- Q Consider the projectile motion of two balls. Ball A is launchedhorizontally (no vertical component of velocity) with an initialspeed of 100 m/s from an initial position 1 m above the...
- Q A 1.1 kg mass is held at rest on top of a frictionless andhorizontal table. A light string loops over a pulley which is inthe shape of a 10 cm...
- Q Sprinter Usain Bolt reached a maximum speed of 11.2 m/s in 2.0swhile running 100-m dash. A) what was his acceleration? B) Whatdistance did he travel during his first 2.0s of...
- Q Considering the Electro Magnetic Flow Meter application ofelectromagnetism. Discuss its operation principle, theoreticalbackground and future developments
- Q what is quantum scattering?
- Q What is the center of mass of the ammonia molecule? Thismolecule has the chemical formula NH3. It is comprised of onenitrogen atom and three hydrogen atoms. The hydrogens arepositioned at...
- Q Consider a dense electron gas in a given metal. What is thecharacteristic temperature? What does this mean physically?
- Q The diagram below is a top-down view of two children pulling a11.1-kg sled along the snow. The first child exerts a force of F1 =10 N at an angle θ1...
- Q Identify and describe the steps of the scientific method.Identify general trends in a data plot.Convert between SI and American units, as well as within units ofthe same system (i.e., from...
- Q You have discovered a new galaxy and you think you haveidentified an Type II Cepheid star with a period of 30 days. Youmeasure its brightness and with the Period-Luminosity function...
- Q A Gaussian surface in the form of a hemisphere of radiusR = 9.86 cm lies in a uniform electric field of magnitudeE = 7.16 N/C. The surface encloses no net...
- Q A 12.0-kg block is pushed across a rough horizontal surface by aforce that is angled 30.0â—¦ below the horizontal. The magnitude ofthe force is 75.0 N and the acceleration of...
- Q One possibility for a low-pollution automobile is for it to useenergy stored in a heavy rotating flywheel. Suppose such a car hasa total mass of 1100 kg, uses a uniform...
- Q A projectile of mass m = 5kg is thrown upward vertically with avelocity v0 = 9 m/sa) Starting with Newton's 2nd Law FNet = ma,calculate the time to an accuracy...
- Q A 78.0 kg hoop rolls along a horizontal floor so that its centerof mass has a speed of 0.190 m/s. How much work must be done on thehoop to stop...
- Q When a DC current passes through the coil, it will produce amagnetic flux around the coil. Is this the reason why the coil getheated? Because the magnetic flux will be...
- Q The deuteron is a bound state of a proton and aneutron of total angular momentum j = 1. It is known to beprincipally an S(â„“ = 0) state with a...
- Q 2 questions thx1) A point source emits sound waves isotropically. A sound metermeasures a sound level of 51.72 dB at location C and a sound levelof 45.53 at location D,...
- Q A.) What is a power law? What does it mean for a quantity likethe electric field to drop off as a power law?B.) Does the electric field always drop off...
- Q A helium-filled toy balloon has a gauge pressure of 0.350 atmand a volume of 8.0 liters. How much greater is the internal energyof the helium in the balloon than it...
- Q A photographic slide is to the left of a lens. The lens projectsan image of the slide onto a wall 7.00 m to the right of the slide.The image is...
- Q 7) While pushing a cart across a floor, Andrea and Jenniferexert forces ?? and ?? on the cart. Andrea’sforce is due north with a magnitude of 130.0 N and Jennifer’sforce...
- Q Calculate the curls of: ? ×V~ = [?yVz ??zVy] xˆ +[ ?zVx ??xVz]yˆ+ [?xVy ??yVx] zˆ  (b) V= y xˆ + z yˆ + x^2 zˆ
- Q The magnitudes of F1, F2 and F3 are 300, 190 and 250 N,respectively. F1 is directed on the slope m =0.6 m/m. F2 is directed alpha = 0.17 radians from...
- Q A car initially traveling at 40 m/s runs out of gas whiletraveling up a slope. It coasts for a distance of 500 m before itstarts to roll back down.a. What...
- Q We wish to coat flat glass (n = 1.50) with atransparent material (n = 1.31) so that reflection oflight at wavelength 500 nm is eliminated by interference.(a) What minimum thickness...
- Q One form of nuclear radiation, beta decay, occurs when a neutronchanges into a proton, an electron and a neutral particle called aneutrino. When this change happens to a neutron within...
- Q with a velocity v = 4.6i m/s. It the strikes the six ball, whichhas an identical mass and is initially at rest. After the collisionthe eight ball is deflected by...
- Q A ball of mass, m is thrown straight up and rises h afterleaving your hand, it momentarily stops. Acceleration due togravity g is downward. Ignore air resistance.Part A (5 points):...
- Q how fast is the sun orbiting the center of the milky way? therevolution period is 230 million years. assume that the sun is 2/3of the distance towards the edge of...
- Q At a particular location < 1.6, -2.5, -3.7 > m in the roomthere is an electric field E= <3400, 0, 0> N/C. Figure outwhere to place a single positive point...
- Q The D-string on a particular violin has a linear density of 1.26× 10-3 kg/m. The distance between the nut and thebridge, between which the string is stretched, is 0.308 m....
- Q Two asteroids collide in space. The collision is not completelyinelastic--the asteroids pull apart and continue on their way.Their masses are 8.7 X 108 kg for Asteroid A and 3.4 X108...
- Q You sometimes create a spark when you touch a doorknob aftershuffling your feet on a carpet. Why? The air always has a few freeelectrons that have been kicked out of...
- Q 1) A human cannonball is launched straight up from the top of100- meter-high rampart at 400 m/s. How long is the cannoneer inthe air above the rampart? Answer: 81.6 s2)...
- Q A projectile is fired with an initial speed of 36.3 m/s at anangle of 41.0 degrees above the horizontal on a long flat firingrange.Determine the maximum height reached by the...
- Q A bathysphere used for deep-sea exploration has a radius of 1.52m and a mass of 1.16 ✕ 104 kg. To dive, this submarine takes onmass in the form of sea...
- Q what is centripetal acceleration please explain this conceptdiscuss the formulas that connect angular velocity to angularaccelerationgive equations that involve centripetal acceleration and explainthem
- Q Derive an expression for the minimum and maximum intensity whenlight reflects from a thin film
- Q A ball is projected at an angle of 53 degrees and aspeed of 30m/s from the top of a cliff on Venus. The ball landsonto the flat, level ground below...
- Q A rectangular loop of wirewith sides H = 27 cm and W = 74 cm carries current I2 =0.187 A. An infinite straight wire, located a distance L = 25...
- Q Having a really hard time with thisquestion!To fit a contact lens to a patient's eye,a keratometer can be usedto measure the curvature of the cornea-the front surface of theeye. This...
- Q A 195 g oscillator has a speed of 125.0 cm/s when itsdisplacement is 2.30 cm and 71.0 cm/s when its displacement is 5.30cm .What is the oscillator's maximum speed?Show work...
- Q Onenumber has three significant figures and another number has foursignificant figures. If these numbers are added, subtracted,multiplied, or divided, which operation can produce the greatestnumber of significant figures? The answer...
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