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A typical decibel level for a buzzing mosquito is 40 dB and normal conversation is approximately 50 dB. How many buzzing mosquitoes will produce a sound intensity equal to that of normal conversation?
A 8.5uC charge is at x_1= 16cm ,y_1 = 7.0cm and a -3.4uC charge is at x_2 = 4.1cm ,y_2 = 10cm. Find the force on the negative charge
The speed of a bicyclist that is riding in the direction of the wind is 7.6 km/h relative to the wind. what is the speed of the bicyclist
How much heat flows from 1.0 kg of water at 40.0 degrees C when it is placed in contact with 1.0 kg of 16.0 degrees C water in reaching equilibrium, what is the change in entropy due to this heat transfer
A 240g air track glider is connected to a string hanging over a frictionless pulley. find the acceleration of the hanging mass
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.81 m, Calculate the power emitted by the human body
A bus makes a trip according to the position time graph shown in the drawing. Find the average velocity (magnitude & direction) of the bus during each of the segments labelled A, B, & C?
find the energy in joules of the photons.
A moving particle encounters an external electric field that decerases its kinetic enegery from 9420 eV to 8580 eV as the particle moves from position A to position B. Determine the charge of the particle
A magnetic field is oriented at an angle of 43 degrees to the normal of a rectangular area 4.7cm by 6.9cm . If the magnetic flux through this surface has a magnitude of 4.8×10^?5T*m^2 , what is the strength of the magnetic field?
A parachutist bails out and freely falls 61 m. Then the parachute opens, and thereafter she decelerates at 2.3 m/s2. How long is the parachutist in the air
q1. a vertical electric field of magnitude 3.00 104 nc exists above the earths surface on a day when a thunderstorm is
Calculate the angular velocity? of an electron orbiting a proton in the hydrogen atom, given the radius of the orbit is 0.500x10-10 m . You may assume that the proton is stationary and the centripetal force is supplied by Coulomb attraction.
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