Angstrom = 10^-10 m
for nucleus size are used fermi (femtometer  10^-15 m )
        
             
        
        
        
 0.04m²
Explanation:
Given parameters: 
Pressure = 250000Pa
Weight = 40000N
Unknown: 
Area of each foot = ? 
Solution: 
Pressure is the force exerted per unit area of a body
   Pressure = 
 To find the area; 
         Area = 
     Area =  = 0.16m²
 = 0.16m²
The force exerted by all the four feet is 0.16m²
the area of each feet =  = 0.04m²
 = 0.04m²
Learn more: 
Pressure brainly.com/question/7139767
#learnwithBrainly
 
        
             
        
        
        
Answer:
C) Use a battery with more voltage.
Explanation:
The equation for the magnetic field around a coil is given by,
B = μ₀NI
where, 
B = Magnetic flux density
μ₀ = permeability
N = number of turns per meter
I = Current in the wire
So when using a higher voltage battery, more current passes through the battery as resistance of the wire remains the same.
 
        
                    
             
        
        
        
Answer:
T_finalmix = 59.5 [°C].
Explanation:
In order to solve this problem, a thermal balance must be performed, where the heat is transferred from water to methanol, at the end the temperature of the water and methanol must be equal once the thermal balance is achieved.

where:

mwater = mass of the water = 0.4 [kg]
Cp_water = specific heat of the water = 4180 [J/kg*°C]
T_waterinitial = initial temperature of the water = 85 [°C]
T_finalmix = final temperature of the mix [°C]

Now replacing:
![0.4*4180*(85-T_{final})=0.4*2450*(T_{final}-16)\\142120-1672*T_{final}=980*T_{final}-15680\\157800=2652*T_{final}\\T_{final}=59.5[C]](https://tex.z-dn.net/?f=0.4%2A4180%2A%2885-T_%7Bfinal%7D%29%3D0.4%2A2450%2A%28T_%7Bfinal%7D-16%29%5C%5C142120-1672%2AT_%7Bfinal%7D%3D980%2AT_%7Bfinal%7D-15680%5C%5C157800%3D2652%2AT_%7Bfinal%7D%5C%5CT_%7Bfinal%7D%3D59.5%5BC%5D)