Answer:
a
   
b
   
Explanation:
From the question we are told that 
    The diameter is 
    
Generally the radius electron orbit  is mathematically represented as 
       
=>   
This radius can also be represented mathematically  as 
       
Here n is the quantum number and  is  the Bohr radius with a value
 is  the Bohr radius with a value 
     
So 
    
 =>   
Generally the angular momentum of the electron is mathematically represented as 
           
Here  h is the Planck constant and the value is  
           m is the mass of the electron with values 
          So 
                
                 
         
 
        
             
        
        
        
When the applied force increases to 5 N, the magnitude of the block's acceleration is 1.7 m/s².
<h3>
Frictional force between the block and the horizontal surface</h3>
The frictional force between the block and the horizontal surface is determined by applying Newton's law;
∑F = ma
F - Ff = ma
Ff = F - ma
Ff = 4 - 2(1.2)
Ff = 4 - 2.4
Ff = 1.6 N
When the applied force increases to 5 N, the magnitude of the block's acceleration is calculated as follows;
F - Ff = ma
5 - 1.6 = 2a
3.4 = 2a
a = 3.4/2
a = 1.7 m/s²
Thus, when the applied force increases to 5 N, the magnitude of the block's acceleration is 1.7 m/s².
Learn more about frictional force here: brainly.com/question/4618599
 
        
             
        
        
        
Answer:
The type of medium affects a sound wave as sound travels with the help of the vibration in particles.
Explanation:
As different mediums have different amount and size of particles, for example, the speed of sound is faster through solid than liquid as solids have closely packed particles whereas liquids are loosely packed.
 
        
             
        
        
        
Answer:
a)-1.014x  J
J
b)3.296 x   J
J
Explanation:
For Sphere A:
mass 'Ma'= 47kg
xa= 0
For sphere B:
mass 'Mb'= 110kg
xb=3.4m
a)the gravitational potential energy is given by
  = -GMaMb/ d
 = -GMaMb/ d
 = - 6.67 x
= - 6.67 x  x 47 x 110/ 3.4 => -1.014x
 x 47 x 110/ 3.4 => -1.014x  J
J
b) at d= 0.8m (3.4-2.6) and  =-1.014x
=-1.014x  J
J
 
The sum of potential and kinetic energies must be conserved as the energy is conserved.
 +
 +  =
=  +
 + 
As sphere starts from rest and sphere A is fixed at its place, therefore  is zero
 is zero
 =
=  +
 + 
The final potential energy is
  = - GMaMb/d
= - GMaMb/d
Solving for ' '
 '
 =
 =  + GMaMb/d => -1.014x
 + GMaMb/d => -1.014x  + 6.67 x
 + 6.67 x  x 47 x 110/ 0.8
 x 47 x 110/ 0.8
 = 3.296 x
 = 3.296 x   J
J
 
        
             
        
        
        
Answer:
Rate of heat is 45.1 kJ/min
Explanation:
Heat required to evaporate the water is given by
Q = mL
here we know that

now we have


now the power is defined as rate of energy


