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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 container of volume 23 cm3 is initially filled with air. The container is after that evacuated at 0oC to a pressure of 30 mPa. How many molecules are in the container after evacuation if we suppose that air is an ideal gas.
What is the magnitude of the maximum torque. What is the utmost load for this crane at an angle of 15° with the horizontal.
A long, straight wire of length 0.75 m carries a current of I=1.5 A in a region where B= 2.3 T. what is the angle between the field and the wire
Explain how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.Please provide step-by-step method to solving the problem.
(a) compute the absolute pressure at the bottom of a freshwater lake at a point whose depth is 25.5 m. assume the density of the water is 1.00 x10^3 kg/m3 and the air above is at the pressure of 101.3 kPa.
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. compute the focal length of the mirror
A cyclist is using cranks with a length of 17cm and a front sprocket of radius 10cm. while standing up she places her body weight onto the forward pedal. the crank is initially horizontal and the force in the pedal is equal to body weight. cyclist..
A hydrogen atom is in its n = 8 excited state. Determine, according to quantum mechanics, find the total energy (in eV) of the atom
Four particles, one at each of the four corners of a square with 3m-long edges, are connected by massless rods. The masses of the particles are m1 = m3 = 4kg and m2 = m4 = 5kg. Determine the moment of inertia of the system about the z axis.
The electric field at a distance of 0.148m from the surface of a solid insulating sphere with radius 0.367m is 1690N/C, Calculate the electric field inside the sphere at a distance of 0.217m from the center
Four identical particles each have charge q and mass m. They are free from rest at the vertices of a square of side L. How fast is each charge moving when their distance from center of the square doubles.
Two railroad cars, each of mass 7300 kg and traveling at 73 km/h, collide head on and come to rest. How much mechanical energy is lost in this collision
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