4. A 3.8 kg sample of an unknown metal is heated to 396°C and then submerged in 1.0 L of 22°C water. The final temperature of the metal and water both is 89°C. Determine the unknown substance. (5 marks)

From the perspective of an employee that effective channeling of work related information and concerns

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.

What are some important factors to consider when choosing a warm-up before your workout?