Master Physics with Fun Quizzes & Brain Teasers!

if an amplifier has an r in = 1 k, and a coupling capacitor of value 33 f, the approximate cutoff frequency would be
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What is the diffraction limit of a 120-meter radio telescope observing radio waves with a wavelength of 21 centimeters?
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a 2.4-cm-tall object is 15 cm in front of a converging lens that has a 24 cm focal length.calculatae the image positioncalculate the image height
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for light that originates within a liquid and strikes the liquid/air interface, the critical angle is 36. what is brewster's angle for this light?
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at 20 degrees celsius what mass of ethnol will occupy 250. ml
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what is the self-inductance of a solenoid 30.0 cm long having 100 turns of wire and a cross-sectional area of 1.00 10 4 m 2 1.00104m2 ? ( 0 = 4 10 7 t m / a )
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A 5.1-m-long rope of mass 2.0 kg hangs from a ceiling.Part A:What is the tension in the rope at the bottom end?Part B:What is the wave speed in the rope at the bottom end?Part C:What is the tension in the rope at the top end, where it is attached to the ceiling?Part D:What is the wave speed in the rope at the top end?Part E:It can be shown that the average wave speed in the rope is 12gL, where L is the length of the rope. Use the average wave speed to calculate the time required for a pulse produced at the bottom of the rope to travel to the top.
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a canoe that weighs 600 n floats in a lake. what is the buoyant force on the canoe
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a 2.50-kg object is attached to a spring of force constant k = 4.50 kn/m. the spring is stretched 10.0 cm from equilibrium and released. what is the maximum kinetic energy of this system?
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Imagine that we strike two tuning forks, one with a frequency of 340 Hz, and another with frequency 342 Hz. What will we hear? Hint: what quantity does our response depend on in the case of the sound waves, and is that different or not compared to EM waves?
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what resistance should you use (instead of the 5.20 m resistor) to obtain a 1.00 ns time constant, perhaps needed for quick response in an oscilloscope?
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Whats a cone of depression?A. An area where one cave connects to another caveB. An area where the water table slopes toward a wellC. An area where a cave collapses in on itselfD. An area where surface water reaches an aquifer
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Which of Maxwell's equations can be used, along with a symmetry argument, to calculate the electric field of a point charge? ds B.dA B.dA ED po I 6. B.dA I uo eo 10. E.ds
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A skier with mass m starts at the top of a very large frictionless snowball, with an initial speed close to zero, and skis straight down the side as shown in the figure abovea. Find the magnitude of the normal force exerted on the skier as a function of the angle (lpha), the skiers mass m, and the acceleration due to gravity g.b. At what critical angle c does the skier lose contact with the snowball?c. Qualitatively describe the motion of the skier after losing contact with the snowball.
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find the steady-state response of a cantilever beam that is subjected to a suddenly applied step bending moment of magnitude m0 at its free end.
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find the total mass of the triangular region shown below. all lengths are in centimeters, and the density of the region is ()=1 grams/cm2.
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why can a hearing test show that your threshold of hearing is 0db at 250 hz, when the figure on the front side implies that no one can hear such a frequency at less than 20 db
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a laboratory experiment produces a double-slit interference pattern on a screen. if green light is used, with everything else the same, the bright fringes will be
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A current loop on a stand (that allows it to rotate) is currently sitting so the plane of the loop is horizontal. The current is going counter-clockwise in the loop, as seen from above.Which directions of the magnetic field will result in a magnetic torque on the loop?SouthNorthVertically out of the pageWestEast
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A wrecking ball swings at the end of a 13.3-m cable on a vertical circular arc. The crane operator manages to give the ball a speed of 12.3 m/s as the ball passes through the lowest point of its swing and then gives the ball no further assistance. Friction and air resistance are negligible. What speed vf does the ball have when the cable makes an angle of 13.0 with respect to the vertical?
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A baby's mouth is a distance of 35 cm from her father's ear and a distance of 1.60 m from her mother's ear. What is the difference between the sound intensity levels heard by the father and by the mother? Express your answer using two significant figures. fathermother=
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if you blow between two limp pieces of paper held hanging down a few inches apart, will the pieces of paper come closer together or move farther apart? explain.
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a sample of a gas occupies 145 ml at 25c and 612.5 mmhg. what volume will it occupy at the same temperature and 380.5 mmhg?
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as measured in earth's rest frame, a spaceship traveling at 0.8c takes 12 y to travel between planets. how long does the trip take as measured by someone on the spaceship?
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