Genetics may cause you to become depressed easier, but your environment affects your mood and can affect your long term attitude.  Please mark Brainliest!!!
        
                    
             
        
        
        
Answer:
Fluids exert forces on objects because of many molecules of the fluid that continuously collide with the surfaces of the object immersed in the fluid. ... A steel boat floats on water but a steel block does not because the block has more weight than the steel boat due to the buoyant force.
Explanation:
 
        
             
        
        
        
Answer: 1000 Hz
Explanation:
You can calculate frequency by dividing velocity by wavelength
Frequency = velocity/wavelength
Find velocity first. 
900 m/3 s = 300 m/s
Plug values in to find frequency. 
F = (300 m/s)/0.3 m
F = 1000 Hz