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Two in-phase loudspeakers, 15.0 m apart, are setup in an open field to avoid reflections from objects. Each speaker is producing 250 Hz tones and the speed of sound is 340 m/s. A person stands at the midpoint between the speakers. (a) What does this person hear, constructive or destructive interference? Why? (b) They now walk towards one of the speakers. How far from the center must they walk before they first hear the sound become a minimum intensity? (c) How far must they walk from the center before they first hear a sound intensity maxima? (d) Repeat (a) through (c) if the speakers are 180° out of phase.
you send a beam of light from a material with index of refraction 1.23 into an unkown material. in order to help
A drop of unknown liquid is placed at the point on a glass surface where internal reflection is occurring at ? = 48°. What is the refractive index of the liquid
three point charges 1 mc 1 mc and -1mc are placed in three vertices of a square which has 2 m long sides. the picture
Waves moving on a lake have a speed of 2.8 m/s and a distance of 1.6 m between adjacent crests. Find the period of the wave motion
Suppose a planet is discovered orbiting a distant star with 11 times the mass of the Earth and 1/11 its radius. How does the escape speed on this planet compare with that of the Earth
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 3.7 kg · m2. find the resulting angular speed of the student and the stool
An iron bar of mass, 0.5 kg, slides down a frictionless incline 0.32 m high. What is the speed of the combined masses after collision
The bob of a simple pendulum that is 1.00m long is held so the sting is horizontal and just taut. How fast is the bob moving when the string makes a 30.0degree angle with the vertical
A solid sphere of mass m = 0.5 kg and radius r = 0.2 m, initially at rest, has a torque 9in units of N per m) applied to it about its CM. what is the angular velocity of the sphere
A 0.060kg ball is propelled by a 1.10kg racquet from rest to a speed of 40.0m/s. If the two objects are in contact for 250ms, calculate the average force exerted by the racquet on the ball
A uniform electric field exists in the region between two oppositely charged parallel plates 1.67cm apart. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the conflicting plate in a time int..
a hot-air balloon is rising upward with a constant speed of 2.41 ms. when the balloon is 8.13 m above the ground the
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