repeated mesurement can reduce the error
it is true
if you take any mesurement repeatedly and the average is taken, the error will be less
 
        
             
        
        
        
The answer is B: 6; 4. Carbon has four electrons in its outermost shell, which are its valence electrons.
 
        
                    
             
        
        
        
(a). If the temperature of a substance is increased the density of it will also increased. The temperature is directly proportional to the density because the molecular activity of the substance will be affected by the temperature
(b).The mass of the substance doesn't at all. Because the amount of matter inside the substance cannot be affected by the temperature except that its water 
        
             
        
        
        
Answer:
AFter 3.5 s, the wagon is moving at:   
Explanation:
Let's start by finding first the net force on the wagon, and from there the wagon's acceleration (using Newton's 2nd Law):
Net force = 250 N + 178 N = 428 N
Therefore, the acceleration from Newton's 2nd Law is:

So now we apply this acceleration to the kinematic expression for velocity in an object moving under constant acceleration:

  
        
             
        
        
        
Answer:
Explanation:
According to Boyle's law  for constant temperature of gas Pressure is inversely proportional to the volume of gas.



if Pressure is tripled then


Volume becomes one-third of original volume