**Question1**

A woman walks 290 m in the direction 37° east of north, then 177 m directly east. Find

(a) magnitude and

(b) angle (from due east) of her final displacement from the starting point.

(c) Find out the distance she walks.

**Question2**

A 25-cm-long wire with a linear density of 20 g/m passes across an open end of an 85-cm-long open-closed tube of air. If the wire that is fixed at both ends vibrates at its fundamental frequency, sound wave it generates excites the second vibration mode of the tube of air. What is tension in the wire? Suppose speed of sound is 340 m/s.

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