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A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W (720 solar luminosities). The apparent magnitude of the Cepheid is 3.7 while that of the Sun is -26.74. Use this information to calculate the distance to the Cepheid.
A small ball of mass, m = 8.60 × 10-9 g, has acquired an excess charge. The ball is then placed between two parallel plates spaced x = 3.45 mm, How many electrons did the ball gain or lose
A device known as Atwood\'s machine consists of two masses hanging from the ends of a vertical rope that passes over a pulley, calculate the magnitude of their acceleration, a, and the tension in the rope, T
A 2.0{\rm mm} -diameter ball bearing has 3.0×109 excess electrons. What is the ball bearing's potential
A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. what is the minimum nonzero thickness of the film
Two events in regerence frame S occur 10 microseconds apart at the same point in space. What is the distance between the events in frame S'
An artificial satellite circling the Earth completes each orbit in 118 minutes. Find the altitude of the satellite
write down the equations expressing conservation of momentum for the components in the x and y directions separately.
find the moment of inertia about the z axis of the hemispherical shell of z= (2^2-x^2-y^2)^(1/2), derive the unit normal vector for surfaces given by y=g(x,z_ x=h(y,z)
Calculate the momentum of a photon having a wavelength of 53.0 nm and Find the velocity of an electron having the same momentum
the maxium compresional stress that a bone can with stand is 1.6 * 10^8 N/m^2 before it breaks.What is the maxium compresional force that can be applied to the femur bone
A plane normally takes 10 hours to travel 5, 500 miles. One day significant headwinds slow the plane down, how long will the entire trip take
A source produces sound waves of time period .001 second and wave length of 20 cm. find the time taken by sound waves to travel a distance of 800 metres.
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