Two loudspeakers in a plane, 5.0 m apart, are playing the same frequency. if you stand 11.0 m in front of the plane of the speakers, centered between them, you hear a sound of maximum intensity. as you walk parallel to the plane of the speakers, staying 11.0 m in front of them, you first hear a minimum of sound intensity when you are directly in front of one of the speakers. part a)what is the frequency of the sound? assume a sound speed of 340 m/s. i got 120.02 hz. this is right, i checked. part b)if you stay 12.0 m directly in front of one of the speakers, for what other frequencies between 100 hz and 700 hz is there a minimum sound intensity at this point?

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?