Objective 
because it means<span> based on measurement, or reasoning free of bias.</span>
        
                    
             
        
        
        
1).  an electric motor running
Electrical energy is changing into kinetic energy and a little bit of heat
2).  light a match
The chemical energy stored in the match head changes into light and heat energy.
3).  a light bulb
Electrical energy is changed into light and heat energy.
        
             
        
        
        
Answer:
If the two waves have the same amplitude and wavelength, then they alternate between ... In fact, the waves are in phase at any integer multiple of half of a period: ... The propagation velocity of the waves is 175 m/s.
Explanation:
please ask me in brainlist ok
 
        
             
        
        
        
Answer:
The rate of heat conduction through the layer of still air is 517.4 W 
Explanation:
Given:
Thickness of the still air layer (L) = 1 mm
Area of the still air = 1 m
Temperature of the still air ( T) = 20°C
Thermal conductivity of still air (K) at 20°C = 25.87mW/mK
Rate of heat conduction (Q) = ?
To determine the rate of heat conduction through the still air, we apply the formula below.


Q = 517.4 W
Therefore, the rate of heat conduction through the layer of still air is 517.4 W 
 
        
                    
             
        
        
        
Answer: velocity = -0.65 speed =0.65
Explanation:
Velocity =speed+direction speed =distance/time