Volume of a block can be found by: length × width × height. So: 
3.5cm × 2.8cm × 1.6cm = 15.68cm^3
        
                    
             
        
        
        
Answer:
A practical siphon, operating at typical atmospheric pressures and tube heights, works because gravity pulling down on the taller column of liquid leaves reduced pressure at the top of the siphon (formally, hydrostatic pressure when the liquid is not moving).
I hope it's helpful!
 
        
             
        
        
        
The distance between the two charges is 
Explanation:
The electrostatic force between two charged objects is given by Coulomb's law:

where:
 is the Coulomb's constant
 is the Coulomb's constant
 are the charges of the two objects
 are the charges of the two objects
r is the separation between the two charges
In this problem, we are given the following:



Therefore, we can rearrange the equation to solve for r, the distance between the two charges:

Learn more about electrostatic force:
brainly.com/question/8960054
brainly.com/question/4273177
#LearnwithBrainly
 
        
             
        
        
        
Answer:
b 
Explanation:
Brownian motion is the random movement of particles in a fluid due to their collisions with other atoms or molecules. ... Brownian motion takes its name from the Scottish botanist Robert Brown, who observed pollen grains moving randomly in water. He described the motion in 1827 but was unable to explain it.
 
        
             
        
        
        
Answer: Option B
The wavelength for a radio wave with a frequency of  2 × 10⁴ Hz is 
1.5 × 10⁴ m.
Explanation:
Wavelength is the measure of distance between two successive crests or troughs in a standing wave. Also wavelength can be measured as the ratio of velocity of light to frequency. It is like this because wavelength is inversely proportional to the frequency.

As c = 3 × 10⁸ m/s and the frequency is 2 × 10⁴ Hz, then the wavelength will be 

So, the wavelength for a radio wave with a frequency of  2 × 10⁴ Hz is 
1.5 × 10⁴ m.