1. Which of the following would be a testable hypothesis? A: If certain foods are healthy for you, then they should also taste good.
B: Dropping a ball from a height of 10 m will cause it to bounce back up 5 m.
C: If acid is added to a solution, then the pH of the solution will go down.
D: Plants produce glucose as the end product of photosynthesis.
2. Which two adjectives describe a hypothesis?
A: conditional and convincing
B: unobservable and untestable
C: tentative and testable
D: conclusive and concrete

Not all tiles will be usedidentify the element present in each star based on the gaps observed in wavelengths of its light refer to this table containing absorption wavelengths (in nm) of several different elements the table ishelium 447, 502 ,587 ,668carbon 427 ,515, 600 ,678sulfur 425, 565, 639, 675xenon 484, 590, 687calcium 429 ,527, 593, 645silver 421 ,521, 662

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.

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?