On a particularly foggy night, a boat travels due east at 10 m/s. there are safety lights, but with the low visibility, the captain opts to sound the horn for 3 seconds every 5 seconds. the captain hears a beat frequency on the third blast he watches his compass and turns hard port maintaining the turn. when he no longer hears the beat, he straightens out his heading.
1. what caused the beat frequency?
2. why did turning stop the beat?
3. what was the frequency of the beat assuming lsound = 350 m/s?

Which is not true about oxygen-17 and oxygen-18?

Abucket full of water weights 4 kg and water well is 10m deep. a girl draws water from the well. it takes the girl 3 minutes to draw a bucket full of water from the well. what is the power of the girl?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?