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The Cosmic Background Radiation Outer space is filled with a sea of photons, created in the early moments of the universe. The frequency distribution of this "cosmic background radiation" matches that of a blackbody at a temperature near 2.7 K.
What is the peak frequency of this radiation?
What is the wavelength that corresponds to the peak frequency?
An electron (charge -e) is projected horizontally into the space between two oppositely charged parallel plates. The electric field between the plates is 462N/C upward.
A submarine is 309 m horizontally out from the shore and 149 m beneath the surface of the water. find the height of the building
An open organ pipe (i.e., a pipe open at both ends) of length Lo has a fundamental frequency Fo, what is the new fundamental frequency
A 0.527-kg mass is attached to a horizontal spring with k = 108 N/m. The mass slides across a frictionless surface. Find the mechanical energy of the system.
A 75-kg man is riding in a 75-kg cart at 1.0 m/s. He jumps off in such a way as to land on the ground with no horizontal velocity
The plates of a parallel-plate capacitor are charged to a potential difference of 12.0 V. If the capacitance is 15.0 µF, calculate the energy stored in the capacitor
Light of wavelength 588 nm falls on a double slit. First-order bright bands appear 3.65 cm from the central bright band. The screen is 1.20 m from the slits. How far apart are the slits.
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 192 N and is 3.1 m long. What is the tension in each rope
A plastic block of dimensions 2.5 cm x 3.8 cm x 4.0 cm has a mass of 28.0 g. What is the density of the block? If placed into a cup of water, will the block float or sink
A uniform rod of length 0.790 m and mass 14.50 kg is balanced on a sharp edge at 0.650 m from the left end. At the left end hangs a mass of 45-kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium.
A massless pan hangs from a spring that is suspended from the ceiling. When empty, the pan is 50cm below the ceiling. What is the pan's distance from the ceiling when the spring reaches its maximum length
A 230g baseball is pitched at 42m/s spinning at 40rad/s . You can treat the baseball as a uniform solid sphere of radius 4.0cm
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