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Radiotelescopes are designed to observe 21-cmwaves emitted by atomic hydrogen gas. A signal from a distant radio-emitting galaxy is found to have a wavelength that is 0.30cm longer than the normal 21-cm wavelength. Estimate the distance to this galaxy.
A solid bowling ball with a radius of 10.9 cm and a mass of 7.1 kg rolls along a bowling alley at a linear speed of 3.0 m/s. What is its translational kinetic energy
Compute approximately the time the ball is in contact with the floor to be 0.04 seconds. Compute the average force the floor exerts on the ball.
Two runners of mass 70 kg and 60 kg,respectively, have a total linear momentum of 350 kg*m/s. The heavier runner is running at 2.0m/s. Examine the possible velocitis of the lighter runner.
A lens with an index of refraction of 1.60 is to be coated with a material (n = 1.39) that will make the lens nonreflecting for yellow-orange light (? = 515 nm) normally incident on the lens
A block with mass m =7.5 kg is hung from a vertical spring. When the mass hangs in equilibrium, the spring stretches x = 0.25 m. what is the magnitude of the net force on the block
What is the radius r of the iron ball?
A uniform rod of length 0.880 m and mass 11.5 kg is balanced on a sharp edge at 0.580 m from the left end. Calculate the torque on the center of mass of the rod alone with respect to the pivot point
A 81-kg fullback is running at 3.3m/s to the east and is stopped in 0.85s by a head-on tackle by a tackler running due west. Calculate the original momentum of the fullback
q1. starting from rest a basketball rolls from the top of a hill to the bottom getting a translational speed of 7.36
A diverging lens with f = -31.5 cm is placed 11 cm behind a converging lens with f = 24 cm. Where will an object at infinity be focused
A 0.94-µF capacitor is charged by a 45.0-V power supply. Find the maximum current in the resulting oscillations
Three 15-? resistors are connected in parallel. This arrangement is connected in series with a 10-? resistor. What is the effective resistance of the parallel portion of the circuit
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