In triangle ABC , using Pythagorean theorem 
BC = sqrt(AB² + AC²)
r = sqrt(y² + x²)                                eq-1
taking derivative both side relative to "t"
dr/dt = (1/(2 sqrt(y² + x²) ) ) (2 y (dy/dt) + 2 x (dx/dt))
dr/dt = (1/(2 sqrt(0.5² + 0.5²) ) ) (2 (0.5) (dy/dt) + 2 (0.5) (dx/dt))
dr/dt = (1/(2 sqrt(0.5² + 0.5²) ) ) ( v₁ + v₂)
15= (1/(2 sqrt(0.5² + 0.5²) ) ) ( - 30 + v₂)
v₂ = 51.2 m/s
 
        
                    
             
        
        
        
Answer:
   k_max = 31.82 w/mk
   k_min  = 17.70 w/mk
Explanation:
a) the maximum thermal conductivity is given as

where k_m is thermal conductvitiy of metal
k_p is thermal conductvitiy of carbide
v_m = proportion of metal in the cement = 0.17
v_p = proportion of carbide in the cement = 0.83
             = 66*0.17 + 28*0.83
            k_max = 31.82 w/mk
b) the minimum thermal conductivity is given as

           = \frac{28+66}{28*0.17 +66*0.83}
         k_min  = 17.70 w/mk
 
        
             
        
        
        
Answer:
The given symbol is of DC power source
Option A is incorrect because in ammeter a letter  A is written inside a circle.
Similarly, Option B is incorrect because in voltmeter V is written inside a circle
Option C  and D are  incorrect 
Option E is correct it is a DC power source.
It is a Dc power source the left hand side is positive side and the right line is the negative side.  
 
        
                    
             
        
        
        
Answer:
orce or acceleration b. Ms. Sunderland finally decided to take this seriously and put both hands on the rope and applied a 1000 N force to the left, while Jared and James still struggled with their 300 N force to the right. What is ... 150 more force. 10. During 5th period Dylan resisted the forces applied by her classmates in a ...
Explanation:
 
        
             
        
        
        
The answer is Caribbean Sea south of San Juan, Puerto Rico. A protectorate,
in its beginning accepted by modern international law, is a reliant territory
that has been arranged local independence and some individuality while still remembering
the suzerainty of a better sovereign state.