Answer:  
a) the magnitude of r is  184.62
b)  the direction is 37.74° south of the negative x-axis
     
Explanation:
Given the data in the question;
as illustrated in the image blow;
To find the the magnitude of r, we will use the Pythagoras theorem
r² = y² + x²
r = √( y² + x²)
we substitute
r = √((-113)² + (-146)²)
r = √(12769 + 21316 )
r = √(34085 )
r = 184.62
Therefore, the magnitude of r is  184.62
To find its direction, we need to find ∅ 
from SOH CAH TOA 
tan = opposite / adjacent
tan∅ = -113 / -146
tan∅ = 0.77397
∅ = tan⁻¹( 0.77397 ) 
∅ = 37.74° 
Therefore, the direction is 37.74° south of the negative x-axis
 
 
        
             
        
        
        
Answer:
ξ = 0.00845020162 V or 8.4 mV
Explanation:
Magnetic flux measures the total magnetic field that passes through a known area. Magnetic flux describe the effect of magnetic field in a given area. Mathematically, 
magnetic flux (Ф) = BA cos ∅
where 
A = test area
B = magnetic field
before the flip
Ф = Bπr²N
N = number of turn
magnitude of induced emf = N |ΔФ/Δt|
ξ  = 2Nπr²B/dt
ξ  = 2 × 22 × π × (1.02/2)² × 0.000047/0.2
ξ = 44 × π × 0.51² × 0.000047/0.2
ξ = 44 × π × 0.2601  × 0.000047/0.2
ξ = 0.0005378868  × 3.142/0.2
ξ = 0.00169004032/0.2
ξ = 0.00845020162 V or 8.4 mV
 
 
        
             
        
        
        
Idrk sorry... i’m doing this bc it’s asking me to. wish i could help you guys . i really do !
        
             
        
        
        
Protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge).
        
                    
             
        
        
        
Answer:a device for calibrating thermometers at the boiling point of water at a known height above sea level or for estimating height above sea level by finding the temperature at which water boils.
Explanation: