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A loudspeaker receives 8.0 W of power from an audio amplifier, and turns 3 % of that power into sound waves. Assuming this sound is spread uniformly over a hemisphere (half a sphere):
I) What is the intensity (in W/m^2) at a distance of 10.0 m from the speaker?
II) What is the decibel intensity at this distance?
If a violin string transmits waves at 375 m/s and has 295 Hz as its fundamental frequency, what is the string's length.
In a second training exercise, the centrifuge speeds up from rest with a constant angular acceleration. When the centrifuge reaches an angular speed of 2.50 rad/s.
The temperature of a black body can be estimated based on the wavelength of light that it is emitting, Find the surface temperature of a star
The leader of a bicycle race is traveling with a constant velocity of +11.2 m/s and is 10.4 m ahead of the second-place cyclist. The second-place cyclist has a velocity of +9.50 m/s and an acceleration of +1.20 m/s2. How much time elapses before h..
Suppose you wish to lean a 3.00 m ladder against a smooth, vertical wall. The ladder's center of gravity is 2/3 of length from the top. If the coefficient of static friction between the ladder and the floor is 0.60, what is the largest angle ladde..
Light from a star has an intensity of about 75.5×10-8W/m2. how far away is it from Earth
A 5 kg mass attached to a horizontal spring is pulled from its equilibrium position by 3 m and let go. what is the maximum velocity of the mass
A 120 kg mail bag hangs by a vertical rope 4.00 m long. A postal worker then displaces the bag to a position 2.10 m sideways from its original position, always keeping the rope taut.
What is the piston height if the temperature is 30C. How far apart are the plates if there's air between them.
A 3.3-m-diameter merry-go-round with rotational inertia 100kg?m2 is spinning freely at 0.60rev/s. Determine the total energy lost to friction
Three thin uniformly charged shells A, B and C, with radii R, 2R , 3R respectively are placed one inside the other, What is the electric potential at radius 2R
The object to be viewed is placed 2mm beyond the focal point of objective lens. What is the overall magnification of this microscope.
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