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A certain loudspeaker system emits sound isotropically with a frequency of 2270 Hz and an intensity of 1.05 mW/m2 at a distance of 5.26 m. Assume that there are no reflections. (a) What is the intensity (in mW/m^2) at 26.0 m? At 5.26 m, what are (b) the displacement amplitude and (c) the pressure amplitude of the sound? Take the speed of sound to be 343 m/s and the density of air to be 1.21 kg/m3.
An alpha particle, which is a helium nucleus, has a mass of 6.64*10^-27 kg. It is travleing horizontally at 42.3 km/s when it enters a uniform, What is the diameter of the path followed by the alpha particle
asssume that in a particular vacuum tube the potential of the anode is 340 V higher than that of the cathode. If an electron leaves the surface of the cathode with zero initial speed, what is its speed when it strikes the anode.
Two small objects are hung, from a point, on strings 50 cm long. they each have mass .06 grams and are given equal charge, What is the magnitude of the charge on each object
A compound microscope has a barrel length of 163.0 mm and an objective with a 4.110-mm focal length. Find the angular magnification of the eyepiece
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. What is the work done on the jet by the catapult
A 65 diver stands at the end of a 27 springboard. What is the magnitude of the vertical force exerted by the hinge on the board
An insulated Thermos contains 131 cm3 of hot coffee at 82 °C. You put a 12g ice cube at its melting point to cool the coffee. By how many degrees has the coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though ..
A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to ?(t)=?t+?t3, What is the initial value of the angular velocity
Two identical uniform bricks of length 26 m are stacked over the edge of a horizontal surface. What maximum overhang is possible for the two bricks (without tipping)
a person of mass Mp is standing in an elevator of Me suspended from the top of a building by a spring with spring constant k. what is the equilibrium constant of the spring
A baseball is thrown horizontally at a speed of 43 m/s. When it reaches home plate, what is the horizontal component of its velocity
Consider the ballistics pendulum experiment. If M=1kg and m=0.1kg, and the velocity of the bob-ball system right after the collision is Vf=2m/s, what was the initial velocity of the ball before it hit the bob
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