1- Which of the following statements is true about two objects in thermal equilibrium? a. The thermal energies for the two objects are equal.
b. The net flow of heat energy between the two objects is zero.
c. The two objects are at different temperature.
d. There is a net flow of heat energy from one object to the other.

At what time will the interfering waves have an amplitudeof zero?

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.

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?