1. A building in San Francisco has light fixtures consisting of small 2.35-kg bulbs with shades hanging from the ceiling at the end of light, thin cords 1.50 m long. If a minor earthquake occurs, how many swings per second will these fixtures make?
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- 20. A 0.9 kg block is attached to an unstretched spring with a spring constant of 10 N/m. The block is released from rest. How long does it take for the block to return to its initial position? A) 0.3TT S B) 0.5TT S C) 0.6TT S D) 0.9TT S2. Construct a problem where a mass is sitting on top of a spring inside an elevator; both are suspended by a rope and are uniformly accelerating upwards with magnitude 4 meters per second squared. Specify all the masses in the problem, as well as all the forces acting in the problem, and their relative directions.3. A block sitting on a frictionless surface is attached to a spring and pulled to a position 5.0 cm from its equilibrium position before being released. After one cycle, what is the total distance that the block travels?
- 8.Arrows show the magnitude and direction of the force at different points in space. The longer the arrow, the greater the___________ a. Magnitude b. Force C. Amplitude d. DistanceFind the spring constant k for a spring if a force of 11 N stretches the spring 0.48_m. 22.92.N/m 23.87 N/m F. А. 20.01.N/m 18.73 N/m 20.84 N/m D. В. Е. С. 21.82_N/m7. The 2-kg collar is given a downward velocity of 4 m/s when it is at A. If the spring has an unstretched length of 1 m and a stiffness of k = 30 N/m, determine the velocity of the collar at s =1m. 2 m 4 m/s wwww = 30 N/m
- 2. An un-stretched spring has a length of 0.50 m and a spring constant of 100. N/m. What force is required to stretch this spring to a length of 0.60 m?3) P = pvo'smax A sin²(kx-ot). Assuming that dx/dt = v but that all other variables don't depend on t, find dP/dt.During a study session, a friend of yours absent-mindedly taps on his desk regularly at a rate of 11times every 41s.a) Determine the period of your friend's tapping.b) Determine the frequency of your friend's tapping.
- 21.A block is suspended from the ceiling by a long, thin strip of tungsten metal. The strip behaves as a spring. To produce a 0.25 m horizontal deflection of the block, a force of 6.5 N is required. Calculate the spring constant(k) for the tungsten strip. 6.5 N 0.25 m A) 0.038 N/m B) 1.2 N/m C) 1.6 N/m D) 13 N/m E) 26 N/m 22. Which one of the following statements concerning streamline flow is true? A) At any given point in the fluid, the velocity is constant in time. B) Streamline flow occurs when there are sharp obstacles in the path of a fast- moving fluid. C) Streamline flow is described by Pascal's principle. D) Streamline flow is described by Archimedes' principle. E) The velocity vectors are the same for all particles in the fluid.2. The elastic limit of Al is 1.8 X 10^8 Pa. Find the minimum radius (meter) of an Al wire that could support a 10.0 kg mass without surpassing its elastic limit