Showing 51 to 60 of 110 Questions

A “seconds” pendulum has a period of exactly 2.000 s—each oneway swing takes 1.000s.(a) What is the length of a second pendulum in Austin, Texas, where g = 9.793 m/s2?(b) If the pendulum is moved to Paris, where g = 9.809 m/s2, by how many millimeters must we lengthen the pendulum?(c) What would be the length of a seconds pendulum
0412 
An earthquake P wave traveling at 8.0 km/s strikes a boundary within the Earth between two kinds of material. If it approaches the boundary at an incident angle of 47o and the angle of refraction is 35o, what is the speed in the second medium?
1481 
An earthquakeproduced surface wave can be approximated by a sinusoidal transverse wave. Assuming a frequency of 0.50 Hz (typical of earthquakes, which actually include a mixture of frequencies), what amplitude is needed so that objects begin to leave contact with the ground?
0735 
An elastic cord is 65 cm long when a weight of 75 N hangs from it but is 85 cm long when a weight of 180N hangs from it. What is the “spring” constant k of this elastic cord?
2428 
An elastic cord vibrates with a frequency of 3.0Hz when a mass of 0.60 kg is hung from it. What is its frequency if only 0.38 kg hangs from it?
0330 
An energyabsorbing car bumper has a spring stiffness constant of 550 kN/m. Find the maximum compression of the bumper if the car, with mass 1500 kg, collides with a wall at a speed of 2.2m/s (approximately 5 mi/h).
0563 
An object with mass 3.0 kg is attached to a spring with spring stiffness constant k = 280N/m and is executing simple harmonic motion. When the object is executing simple harmonic motion, it is moving with a speed of 0.55m/s. (a) Calculate the amplitude of the motion.(b) Calculate the maximum velocity attained by the object.
1425 
At t = 0, a 755g mass at rest on the end of a horizontal spring (k = 124 N/m) is struck by a hammer, which gives the mass an initial speed of 2.96m/s. Determine (a) The period and frequency of the motion,(b) The amplitude,(c) The maximum acceleration,(d) The position as a function of time, and (e) The total energy
0838 
At what displacement from equilibrium is the energy of a SHO half KE and half PE?
0393 
At what displacement from equilibrium is the speed of a SHO half the maximum value?
0505
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