Some chapter review problems in the back of the book I was having trouble with. Any help is appreciated. (Not asking for answers but directions and formulas explanations if possible) Thank you!! 1) The Empire State Building in New York City oscillates in the wind with a period of 8 seconds. Do you think this period is different on weekdays, when full of people? If different, in which case is the period greater? Explain 2) You watch a distant woman driving nails into her porch at the rate of 1 stroke per second. You hear the sounds synchronized wirh the blows you see. You hear one more blow adter you see her stop hammering. How far away is she? The speed of sound is 343 m/s. *She is 343 meteres away since she was hammering 1 stroke per second and u hear one more after you see the last stroke. 3) A human ear cannot hear sound at a frequency of 100 kHz or a sound at 102 kHz. But, if you walk into a room in which two sources are emitting sound at 100 kHz and at 102khz, you'll hear sound. 4) A pendulum clock can be approximated as a simple pendulum of length 1.00m and keeps accurate time where g = 9.83 m/s^2. In a location where g = 9.78 m/s^2, waht must be the new length of the pendulum, such that the clock continues to keep accurate time (that is that the period remains teh same) 5) Three point charges are fixed to the corners of a square such that the electrical field at the empty corner is zero. Do all the charges a) have the same sign and b) the same magnitude (but, possibly different signs)? Explain. 6) A small drop of water is suspended motionless in air by a uniform elecric field that is directed upward with a magnitude of 8480 N/C. The mass of the drop is 3.50 x 10^-9. a) Is the excess chargeon the drop positive or negative? Why? b) How many excess electrons or porotons reside on the drop? 7) The potetnital at a point in space has a certain value, not zero. Is the electric potential energy the same for every charge that is placed at that point? Explain *It is the same. The value of the point does not matter. 8) If the speed of sound depended on its frequency, would you enjoy the music if you sat far away from the second balcony? Why not?