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In the Bohr model of the hydrogen atom, an electron in the5th excited state moves at a speed of8.76*104 m/sin a circular path having a radius of 1.32*10-9 m. What is the effective current associated with this orbiting electron?
A bicyclist is heading east at 6.6 m/s for 2.5 minutes when she realizes she left her cell phone in her apartment. What is her average speed and velocity for the round trip
A Venturi meter measures fluid speed in a pipe. A constriction (of cross-sectional area A2) is put in a pipe of normal cross-sectional area A1 (A1 = 2A2). Find the ratio of the flow speeds
For a single, isolated point charge carrying a charge of q = 46.7 pC, one equipotential surface consists of a sphere of radius 22.4 mm centered on the point charge as shown. What is the potential on this surface?
You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8*10^7 m and its rotation period to be 22.3 hours. what is the mass of the star
The drawing shows three situations — A, B, and C — inwhich an observer and a source of electromagnetic waves are movingalong the same line. In each case the source emits a wave that hasa frequency of 4.57 x 1014 Hz.
A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 14.0 m
a small object is released from rest and falls 1.00 times 102 feet near the surface of the earth. neglect air
A gymnast of mass 56.0 {rm kg} hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 {rm m/s^2} for the acceleration of gravity.
two crewmen pull a raft through a lock . one crewman pulls with a force of 130 at an angle of 34 relative to the
Define the carrier power, total power and sideband power in the AM signal.
a 370 ml soda can is 6.3 cm in diameter and has a mass of 21 g. such a soda can half full of water is floating upright
A thin film of oil (n = 1.12) is located on smooth, wet pavement. When viewed from a direction perpendicular to the pavement, What is the minimum thickness of the oil film
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