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Describe the time it would take the earth to orbit the collapsed sun if the sun collapsed into a black hole.
a piece of angle iron is hinged at point a. determine the resultant torque at a due to the two acting forces. replace
A lens for a 35mm- camera has a focal length given by = 40mm, What is the magnification of the image on the film
A step-up transformer has 22 turns on the primary coil and 770 turns on the secondary coil.What input current and voltage are needed
A metal rod of length l and mass m is suspended in a magnetic field from two light wires that are connected to a battery with emf μ. When a vertical magnetic field B→ is turned on, the supporting wires make an angle θ with the vertical. Determine th..
Consider the re?ection of light from a soap bubble. The bubble is a thin ?lm of water with air on both sides. Find the minimum thickness (nm) of the bubble so that reflected light constructively interferes
A hare and a tortoise compete in a race over a straight course 1.85 km long. The tortoise crawls at a speed of 0.230 m/s toward the finish line. How far is the tortoise from the finish line when the hare resumes the race
a spherical ball hanging on a string on a smooth, frictionless wall. The mass of the ball is m, its radius is R, and the length of the spring is L. Find the normal force between the ball and the wall
an object with a mass of .40 kg moving with a speed of 25 m/s is brought to rest after sliding on a rough surface. What is the stopping distance of the object
A silver wire 86.4 cm long and 1.04 mm in diameter have a mass of 6.85 g. Discover the number of electrons in the wire. (Silver has an atomic number of 47; that is, there are 47 protons in the Silver atom. Silver's atomic mass is 107.8682.)
Estimate the wavelengths of the first three spectral lines in the Lyman spectral series for hydrogen. What energies (eV) do photons with these wavelengths have?
An electric motor rotating a workshop grinding wheel at a rate of 1.16 x 102 rpm is switched off. Find through how many radians has the wheel turned during the interval found in (a)
A javelin is thrown at an initial speed of 28.5 m/s at an initial height of 1.93 m above the ground, Find this maximum range
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