Answer: B
Explanation: i learned it last year
 
        
             
        
        
        
The cheetah's speed is 100x and
The gazelle's speed is 80x + 70.
Set the two equations equal to each other:
100x = 80x +70 (then subtract 80x from both sides).
20x = 70 (then divide by 20).
X =3.5.
The cheetah catches the gazelle after 3.5
        
             
        
        
        
Answer:
an instrument for measuring an electromotive force by balancing it against the potential difference produced by passing a known current through a known variable resistance.
 
        
             
        
        
        
Kinetic energy increases, potencial energy decreases, 
kinetic energy + potential energy = energy, energy can not be destroyed, just transformed
        
             
        
        
        
Answer:

Explanation:
First of all, we need to calculate the total energy supplied to the calorimeter.
We know that:
V = 3.6 V is the voltage applied
I = 2.6 A is the current
So, the power delivered is 

Then, this power is delivered for a time of
t = 350 s
Therefore, the energy supplied is

Finally, the change in temperature of an object is related to the energy supplied by 

where in this problem:
E = 3276 J is the energy supplied
C is the heat capacity of the object
 is the change in temperature
 is the change in temperature
Solving for C, we find:
