Håkan has bought new speakers that he will install in his living room, which is square with a side of 4.5 m (see figure). Håkan thinks that if he buys four speakers and puts one in each corner, he gets good sound everywhere in the living room.
To test his thinking, Håkan sets up the speakers and connects all four to his amplifier. He then sets a tone with the frequency 200 Hz that plays in phase. Then Håkan walks along one of the stretched lines in the figure.
a) How does the sound sound when Håkan is in the middle of the room?
b) How does the sound change when Håkan walks along one of the lines? Describe and motivate as detailed as possible!

Pl asaaap ! match the term to the correct description. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. movement that is like a t transfers energy from one location to another 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

What kind of simple machine is a catapult?