Answer:
A. kinetic energy
B. angular velocity
E. angular position
Explanation:
The quantities that cannot be constant if a constant net torque is exerted on an objecta are:
A. Kinetic energy. If a torque is applied, the linear or angular speed will be changing at a rate proportional to the torque, so the kinetic energy will change too.
B. Angular velocity. It will change at a rate equal to the torque.
C. Angular position. If the angular velocity changes, the angular position will change.
 
        
             
        
        
        
Answer:
Explanation:
The forces acting on a conductor carrying current placed in a magnetic field is analysed using the Fleming's left hand rule. 
The rule states that "If the fire finger, the middle finger and the thumb are held mutually perpendicular to one another in a magnetic field, the fore finger acts in the direction of the magnetic field, the middle finger acts on the direction of the current while the thumb acts in the direction of the force.
Based on the rule, it can be inferred this current carrying wire placed in the magnetic field acts perpendicular to the magnetic field and force acting on the wire.
 
        
                    
             
        
        
        
Answer:
The minimum distance moved by mirror is 125 nm
Explanation:
Given:
Wavelength of light  m
 m
Here given in question, spot of constructive interference change to a destructive interference.
Hence minimum distance moved by one of mirror is given by,
     
 
Where  distance moved by mirror
 distance moved by mirror
    
    
    
Therefore, the minimum distance moved by mirror is 125 nm
 
        
             
        
        
        
Answer : The distance of the image from the lens is, -42 cm
The height of the image is, 35 cm
Solution :
First we have to calculate the image distance.
Formula used :

where,
f = focal length = 7 cm
p = object distance = 6 cm
q = image distance = ?
Now put all the given values in the above formula, we get the distance of the image from the lens.


Therefore, the distance of the image from the lens is, 42 cm and the negative sign indicates that the image is virtual.
Now we have to calculate the height of the image.
Formula used :

where,
h = height of object = 5 cm
h' = height of image = ?
Now put all the given values in this formula, we get the height of the image.

Therefore, the height of the image is, 35 cm and the negative sign indicates that the image is inverted.
 
        
                    
             
        
        
        
Answer:

Explanation:
given,
free electron per atom = 5.6 x 10⁻¹⁰
density of silicon = 5.32 g/cm³
molar mass of silicon =  72.59 g/mol
number of moles per cubic centimeter
            = 
number of atom per cubic centimeter 
            = 
number of free electron per cubic centimeter 
            = 
            = 