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Suppose someone is running towards a siren which is at rest. The siren emits a frequency of 400 Hz. What will the person hear?
A rock is thrown from the roof of a building with a velocity v(0) at an angle alpha(0) of from the horizontal. Calculate the magnitude of the velocity of the rock just before it strikes the ground
The Bohr model of an atom assumes that electrons orbit the nucleus, in a manner similar to how planets orbit a sun. What is the orbital period of the electron
Two people, one of mass 75kg and the other of mass 60kg, sit in a rowboat of mass 80 kg. With the boat initially at rest, two people, who have been sitting at opposite ends of the boat 3.2 m apart from each other, now exchange seats. How far and i..
The coefficient of static friction between the block and table's surface is &mu s = 1/3. The mass of the block that is hanging down is n1 Kg. The tangent of the angle shown in the figure is tan & theta = n2. What is the minimum value of mass, n3 Kg t..
Electric charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degrees. What is the potential at point P, center of curvature of the arc.
The hydraulic cylinder is subjected to 3 forces. An 8kN force is exerted on cylinder at B that is parallel to the cylinder and points from B towards C. The link AC exerts the force at C that is parallel to the line from A to C. The link CD exerts ..
A metal ball with a mass of 3.71·10-6 kg and a charge of +5.77 mC has a kinetic energy of 4.99·108 J. It is traveling directly at an infinite plane of charge with a charge distribution of +3.21 C/m2. If it is currently 1.87 m away from the plane of c..
Two microphones are located on the Y axis. One(1) is at the origin and the other(2) is at y= 1.5 meters. how far is the source of sound from each microphone
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. What is the total mass of the wire
Find time constant if the ball's amplitude has decreased to 2.20 cm after 51.0 oscillations? Explain your answer.
A laser pulse has an energy of 16 J and a beam radius of 2 mm. The pulse duration is 13 ns and the energy density is constant within the pulse. What is the total energy density within the pulse
A small droplet of oil with mass of 4.81×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 7025 N/C
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