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Suppose that the sound level of a conversation is initially at an angry 74 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 516 Hz, determine the (a) initial and (b) final sound intensities (in ?W/m2) and the (c) initial and (d) final sound wave amplitudes (in nm). Assume the speed of sound is 347 m/s and the air density is 1.21 kg/m3.
Consider an electron in a square infinite well whose sides have length 0.05 nm. What are the values of the lowest eight eigenvalues
a ball of mass 0.075 kg is fired horizontally into a ballistic pendulum. the pendulum mass is 0.350kg. How much kinetic energy was lost in the collision
A spacecraft consists of a 32500 kg engine and a 12600 kg nosecone. How fast is the nosecone moving
The force of gravity acting on the arm acts through point A. Identify the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.
The magnetic flux through a circuit is reduced from 35 Tm^2 to 5 Tm^2 in 0.1s. The current induced in the circuit is 3.6 mA. What is the resistance to the circuit
The basic concepts in optics.
If in Joule's paddlewheel experiment a block of mass 10 kg is allowed to fall through 22.5 meters and the mass of the water is 50 grams
The velocity in a certain flow field is given by the equation V=(3x^2+1)i - 6xyj. Determine the expressions for rthe two rectangular components of acceleration.
On a frictionless table, a glob of clay of mass 0.24 kg strikes a bar of mass 1.34kg perpendicularly at a point 0.38m from the center of the bar and sticks to it. If the bar is 1.14 m long and the clay is moving.
A laser emits a narrow beam of light. The radius of the beam is 3.9 mm, and the power is 3.6 mW. What is the intensity of the laser beam
A concave mirror has a focal length of 28.7 cm. The distance between an object and its image is 52.8 cm. Find (a) the object and (b) image distances, assuming that the object lies beyond the center of curvature and (c) the object and (d) image distan..
machine part rotates at an angular speed of 0.46 rad/s; its speed is then increased to 2.0 rad/s at an angular acceleration of 0.59 rad/s2
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