Momentum = mass x velocity
Thus Option A is the correct answer 
Momentum (dog)  = 10 kg x (0.447 x 30) m/s
= 134.1 Kg m/s
Momentum ( bullet)  = 0.02 kg x (0.447 x 800) m/s
= 7.152 Kg m/s
Momentum ( truck) = 0, as v = 0
tightrope has both low mass  and low speed, thus its momentum will be low
 
        
             
        
        
        
Correct Answers: 
- The waves have a trough
- the waves have a crest 
- the energy that is transferred move in a perpendicular direction 
- particles move in an up and down motion
 
        
                    
             
        
        
        
The sound level of the sound wave due to the ambulance is 140.
<h3>What do you mean by sound?</h3>
In terms of physics, the sound is a vibration that travels through a transmission medium like a gas, liquid, or solid as an acoustic wave. Sound is the reception of these waves and the brain's perception of them in terms of human physiology and psychology. Only acoustic waves with frequencies between roughly 20 Hz and 20 kHz, or the audio frequency range, can cause a human to have an auditory sensation. These are sound waves with wavelengths ranging from 17 meters (56 ft) to 1.7 millimeters in the air at atmospheric pressure (0.67 in). Ultrasounds are sound waves with a frequency higher than 20 kHz that are inaudible to humans. Infrasound refers to sound frequencies below 20 Hz. Animals of different species have different hearing ranges.
To learn more about sound, Visit:
brainly.com/question/9349349
#SPJ4
 
        
             
        
        
        
Answer:
Natural selection is a simple mechanism that causes populations of living things to change over time.  Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success.
 
        
             
        
        
        
Answer:
the formula of mechanical advantage is 
MA = load / effort
VR = effort distance / load distance 
hope it is helpful to you