2.2 A spring-mass system has a natural period of 0.21 sec. What will be the new period if the spring constant is (a) increased by 50 percent and (b) decreased by 50 percent? Ans. a) 0.1715 sec; b) 0.2970 sec

Water flows through a pipe. The diameter of the pipe at point B is larger than at point A.      At which point is the water pressure smaller? 1.)  Point B    2.)  It is the same at both points.      3.) Point A     4.) Cannot be determined from the information given.

spring attached 2.00 kg block is stretched 20.0cm and released from rest on a frictionless surface. The measured period is 1.00 sec. a) What is the spring constant k? b)A student doubled the stretched length. what is the period of the spring? c) You want to make a simple pendulum and a physical pendulum which is a uniform bar, and you want same period with the spring’s period, 1.00sec. Determine the length of simple pendulum (Ls) and physical pendulum (Lp). And find the ratio of their length (Lp/Ls). d) If you doubled the length of the simple pendulum and physical pendulum, what is the period of each pendulum? e)You take these three harmonic oscillatorsto the space station and measure the period. Describe what the measured value of the period of each oscillator would be.Why?

L4-1)

P3). A heavy block of m = 40.0 kg is connected to a spring. The natural frequency of the blockspring system is 0.30 Hz. The system is forced to vibrate sinusoidally. The amplitude of the driving force and its frequency is 5N and vibrating system is Q= 1. 0.190 Hz , respectively. The Quality Factor of this а) Determine the spring constant k of the spring. b) Determine the block's amplitude of motion for the above condition (i.e., at f= 0.190 Hz) c) The driving force suddenly becomes zero. Determine the time it takes for the vibration amplitude to decrease to 1/2 its initial value.