Master Physics with Fun Quizzes & Brain Teasers!

find the half-life of a radioactive element, which decays according to the function a(t)= a0e ^ -0.0305t where t is the time in years.
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A boat on a river is moving with a steady speed. The engine is running. What would happen if the engine was turned off?
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if an amplifier has an r in = 950 , and a coupling capacitor of value 0.33 f, the approximate cutoff frequency would beA. 5.08 hzB. 508 hzC. 50.8 khzD.. 50.8 hz.
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The stone is dropped from a height of 40m. 1 second later, a second stone is thrown from the ground with an initial speed of 25m/s. When and where the stones meet?
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how long (weeks or months) does it take the sun to move from virgo to this other constellation?
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The hour and minute hands of the clock in the famous Parliament Clock Tower in Lon- don are 1.3 m and 2.8 m long and have masses of 94 kg and 58 kg, ...
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if a 0.4 kg baseball at 25 m/s straight into the air, how high does the ball go? (use energy to find the answer) *
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if the temperature of the copper was instead 1350 k, it would cause the water to boil. how much liquid water (latent heat of vaporization = 2.26 106 j/kg) will be left after the water stops boiling?
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if the magnitude of the net force acting on the particle is fff , how long does it take the particle to acquire its final velocity, 2v2v in the positive y direction?
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at what angle does an electric field pass through a line of equal potential
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find the horizontal distance the skier travels before coming to rest if the incline also has a coefficient of kinetic friction equal to 0.229. assume that = 20.0.
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how long will it take a 3250- w motor to lift a 425- kg piano to a sixth-story window 15.0 m above?
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support the crate in fi gure p5.7 can withstand a maximum tension of 1500 n before they break. what is the largest mass the ropes can support?
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Using the parallel axis theorem, what is the moment of inertia of the rod of mass m about the axis shown below? (Use the following as necessary: m and L.)
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what is the electric potential at points a , b , and c in (figure 1)? suppose that q = 2.0 nc , r1 = 1.2 cm , and r2 = 1.7 cm .
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Which one of the following statements is the best explanation as to why nuclear fusion is not at present used to generate electric power?a. Fusion resulted in an infamous catastrophic experiment in Seattle which scared away investorsb. Fusion requires antimatter which cannot be found naturally on Earthc. Fusion processes has resulted in nuclear explosions such as the one which destroyed Chernobyld. Fusion presents technical challenges which havent yet been overcome such as containing and controlling high temperature plasmase. All of the above are false, Dr. Octavius was awarded the Nobel prize for the use of nuclear fusion to generate electricity
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why is angular momentum conserved in these collisions (parts i and ii)? note that linear momentum is not conserved in part ii. how then is angular momentum conserved?
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Two speakers are arranged so that sound waves with the same frequency are produced and radiated through the room. An interference pattern is created is represented in the diagram as shown below. The thick lines in the diagram represent wave crest and the thin lines represent wave frough The wave fronts are 4mm apart. (12 marks) (a). Calculate the difference in distance (in 2) from point S, and S, from point D (b). Calculate the distance (in mm) between source S, and S
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What did Henri Matisse describe as the modern concepts of artistic expression in his Notes of a Painter (1908)?
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two lasers are shining on a double slit, with slit separation d . laser 1 has a wavelength of d/20 , whereas laser 2 has a wavelength of d/15 . the lasers produce separate interference patterns on a screen a distance 4.20 m away from the slits.
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find the wavelength of an electron that has energy of 19 ev. (the energy of the electron is its kinetic energy.)
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on average, if a capacitor is operated at half its voltage rating, by what factor is the life expectancy increased?
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A centrifuge rotor rotating at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.2 m*N. If the mass of the rotor is 4.8 kg and it can be approximated as a solid cylinder of radius .0710 m, through how many revolutions will the rotor turn before coming to rest, and how long will it take?
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An object of mass M suspended by a spring vibrates with period T. If this object is replaced by one of mass 4M, the new object vibrates with the period:a) Tb) 2Tc) 4Td) 16T
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