Physics 2414 Exam 1. A liquid is forced through the needle of a hypodermic B syringe as shown in the figure. The needle is not inserted in any object, but simply open to the air. What can we say about the fluid pressure at point A and B as the liquid is flowing out of the needle? Fluid Pressure at Point A Fluid Pressure at Point B Less than atmospheric pressure Greater than at Point A Equal to atmospheric pressure Greater than at Point A Greater than atmospheric pressure Greater than at Point A Equal to atmospheric pressure The same as at Point A 0 Greater than atmospheric pressure The same as at Point A 2. When an airplane is on the ground the sound wave pattern looks like Figure A. When the airplane is moving, the sound wave pattern looks like Figure B. What does someone who is standing at point P hear in Figure B compared to the case in Figure A? 10 A louder volume. A sonic boom. A higher pitch. A lower pitch. No difference. Figure A Figure B 3. The string shown at the right is fixed at each end and vibrating at 300 Hz. What is the fundamental frequency of the string? 100 Hz 200 Hz 450 Hz 600 Hz 900 Hz