Answer:
a)   m_v = m_s (( )² - 1) ,  b)  m_v = 1.07 10⁻¹⁴ g
)² - 1) ,  b)  m_v = 1.07 10⁻¹⁴ g
Explanation:
a) The angular velocity of a simple harmonic motion is
            w² = k / m
where k is the spring constant and m is the mass of the oscillator
let's apply this expression to our case,
silicon only
          w₉² =  
          k = w₀² m_s
silicon with virus
          w² =  
           k = w² (m_v + m_s)
in the two expressions the constant k is the same and q as the one property of the silicon bar, let us equal
            w₀²  m_s = w² (m_v + m_s)
            m_v = ( )²  m_s - m_s
)²  m_s - m_s
            m_v = m_s (( )² - 1)
)² - 1)
b) let's calculate
           m_v = 2.13 10⁻¹⁶ [( )² - 1)]
)² - 1)]
           m_v = 1.07 10⁻¹⁴ g
 
        
             
        
        
        
Answer: because they have equal numbers of protons
Explanation: Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion
 
        
             
        
        
        
Answer:
For example, when a car travels at a constant speed, the driving force from the engine is balanced by resistive forces such as air resistance and friction in the car's moving parts. The resultant force on the car is zero.
Explanation:
hope this helps