Two speakers that are 12.0 m apart produce in-phase sound waves of frequency 245 hz in a room where the speed of sound is 340 m/s. a woman starts out at the midpoint between the two speakers. the room's walls and ceiling are covered with absorbers to eliminate reflections, and she listens with only one ear for best precision.

(a) why is this constructive interference?

(b) she now walks slowly toward one of the speakers. how far from the center must she walk before she first hears the sound reach a minimum intensity?

(c) how far from the center must she walk before she first hears the sound maximally enhanced?

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false