1) The model airplanc has a mass of 3 kg, and is flying horizontally at a constant speed of 21 m/s at a radius of 2.7 m.
a) What tension is in the string?
b) If the plane's mass is doubled, what happens to the tension is part a?
c) If the plane's speed is doubled, what happens to the tension is part a?
d) If the string's length is doubled, what happens to the tension is part a?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Should we celebrate the voyages of zheng he mini q answer key