Master Physics with Fun Quizzes & Brain Teasers!

What is the definition of the aerodynamic center (AC) of an airfoil? Group of answer choices resultant of all static pressures acting on an airfoil multiplied by the planform area point on a cambered airfoil where pitching moment is constant with changing AOA line of action where all forces act through the chord line maximum thickness point
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a 4 kg box sits on a table. the side of the box facing the table measures 20cm x 30 cm. the pressure on the table is
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suppose the tension is increased. does a wave take more, less, or the same time to travel from one end to the other?
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A 750-Hz plane sound wave in seawater (13 degree C) is normally incident on a stone seawall. The sound field is found to have a maximum at the wall; the SPL there is 190 dB re 1 muPa. The SPL 0.5 m from the wall is 177 dB. (a) Use the information given about the sound field to find the impedance of the wall. (b) Find the SPL of the incident wave.
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________ will prevent mass wasting by decreasing the driving force.
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In a krypton laser, find the energy difference between the two levels involved in the production of green light of wavelength 520.8 nm by this system. in eV?
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What do the numbers and densities of the craters imply about the relative ages of these two regions of the Moon? Do your results support your working hypothesis? Comment, making sure you include the effects of uncertainties in identifying and including all craters. The number vs the densities of the craters, it looles like the upper mare region is younger than the 3.7, Gyra the age of the cratered highidhds region is between 3.8 Gyr. & 3.9 Gyr. Uncertains in the measurements CMO! from not guessing the Craiters accurately especially the smell ones... 5. Comparing crater densities on a terrestrial world easily leads to statements of relative ages, but relating crater densities to actual ages for the Moon required our sending astronauts there to bring back rocks to be dated based on radioactive isotopes. Based on your results, what are the approximate ages or age ranges for the cratered highlands region and the upper mare region?
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Consider the modified Atwood machine shown in Figure 13.11. The two weights on the left have equal masses m and are connected by a massless spring of force constant k. The weight on the right has mass M = 2m, and the pulley is massless and frictionless. The coordinate x is the extension of the spring from its equilibrium length; that is, the length of the spring is l. + x where is the equilibrium length (with all the weights in position and M held stationary). (a) Show that the total potential energy
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true/false. The gravitational force between the two objects is weak because they are 1 m apart. No gravitational force exists between the two objects because their masses are small.
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in a photoelectric effect experiment you illuminate a metal with light of wavelength 260 nm and measure a stopping potential of 1.1 v.
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A ball of mass 2kg is thrown up with a speed of 10m/s. find the kinetic energy of the ball at the time of throwing. Also find the potential energy of the ball at the highest point?
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Consider the video you just watched. The two pucks of equal mass did not move linearly (they came to a stop) after the collision due to the conservation of linear momentum. However, since the two pucks mutual center of mass does not coincide with either of the pucks velocity vectors, they have angular momentum. This becomes evident after the collision when due to conservation of angular momentum the two pucks spin around their mutual center of mass. The two pucks collide and stick together (they have velcro)due to angular momentum they spin. Part A Suppose we replace both hover pucks with pucks that are the same size as the originals but twice as massive. Otherwise, we keep the experiment the same. Compared to the pucks in the video, this pair of pucks will rotate a.at the same rate. b.one-fourth as fast. c.four times as fast. d.twice as fast. e.one-half as fast.
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for parallel circuits, you saw that the potential difference across each resistor was the same as the potential difference of the battery. use your rule for potential difference in series circuits to explain why this would happen.
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at what distance and redshift does an object of 1 kpc across subtend an angle of 1 arc second?
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Suppose we have a simple AC circuit with just an inductor in it, and we want a 22 k reactance at a frequency of 510 Hz.What value of inductance should be used in H?
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what should be the initial temperature of this metal if it is to vaporaize 20.54ml of water initially at 75c? aassyme that the final vapor temperature is 100c
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a 2.0102 kg tumor is treated with a high-energy proton beam. if the equivalent dose delivered to the tumor is 1400 rem , how much energy did the tumor absorb?
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why is the microwave used for heating, instead of a sand bath
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assume the light beam is shone so that theta = 38degrees. if the plastic slab is 10 cm thick in the vertical direction, how long did it take the beam to travel through the plastic?
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locate the center of mass (x, y, z) of the homogeneous block assembly.
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if the half-life of cobalt-60 is 5.3 years, and exactly 15.9 years ago, you began with a cobalt-60 sample that had an initial decay rate of , what would be the strength of the radioactive source now?
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Which of these cannot be negative? You may pick more than one. a mechanical energy b kinetic energyc orbital energy d potential energy
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Two rocket ships are racing toward Earth. Ship A is in the lead, approaching the Earth at v1 = 0.84c and separating from ship B with a relative speed of 0.50c.(a) As seen from Earth, what is the speed, v, of ship B?(b) If ship A increases its speed by 0.10c relative to the Earth, does the relative speed between ship A and ship B increase by 0.10c, by more than 0.10c, or by less than 0.10c?Explain(c) Find the relative speed between ships A and B for the situation described in part (b).
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a container filled with helium and argon gas is 8.00y volume argon. what is the partial pressure of argon if the total pressure inside the container is 4.100 atm?
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