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luisa fer

luisa f.

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INSTANT ANSWER

An object undergoing simple harmonic motion with aperiod T is at the position x = 0 at the time t = 0. At the timet = 0.25T the position of the object is positive. State whether xis positive, negative, or zero at the following times: (a) t = 1.5T,(b) t = 2T, (c) t = 2.25T, and (d) t = 6.75T

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INSTANT ANSWER

Checkpoint 1 A particle undergoing simple harmonic oscillation of period T (like that in Fig: 15-2) is at Xm at time t = 0.Isit at ~xmat +Xm at 0,between ~Xm and 0,or between 0 and +xm when (a) t = 2.00T,(b) t = 3.S0T,and (c) t = 5.25T? Answer: (a) at-Xm (b) at Xm (c) at 0

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INSTANT ANSWER

A 0.150-kg mass is undergoing simple harmonic motion at the end of a horizontal spring with a force constant, k = 300 N/m. At t = 0 the mass is 0.0120 m from its equilibrium position, and it is observed to have a velocity of +0.300 m/s.Find:a) angular frequency, the phase angle, and amplitude Ab) total energyc) the maximum speed and acceleration attained by the mass.

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ANSWERED

Christopher Dzorkpata verified

Numerade educator

A gate 4.00 m wide and 2.00 high weighs 500 N. Its center of gravity is at its center, and it is hinged at A and B. (Note the hinges are positioned at the top and bottom of the left side of the gate.) To relieve the strain on the top hinge, a wire CD is connected as shown in the figure. The tension in CD is increased until the horizontal force on hinge A is zero. a) What is the tension in wire CD?

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