Answer:
a)
reaction time = 0.70 s
distance travelled in reaction time = v*t
= 20 m/s * 0.70 s
= 14 m
So, when brake is applied, distance remaining= 110 m - 14 m = 96 m
Answer: 96 m
b)
vf = 0 m/s
d = 96 m
vi = 20 m/s
use:
vf^2 = vi^2 + 2*a*d
0 = 20^2 + 2*a*96
-400 = 2*a*96
a = -2.08 m/s^2
Answer: -2.08 m/s^2
c)
use:
vf = vi + a*t
0 = 20 - 2.08*t
t = 9.6 s
Answer: 9.6 s
Explanation:
 
        
             
        
        
        
Answer:
A horse pulls a wagon along a road
 
        
             
        
        
        
Answer:
except ii and iii
Explanation:
The angle of reflection is the angle to the normal the white rays strikes the water surface and it is the incidence angle. Since the white light is moving from less dense medium to a denser medium or a medium with a higher refractive index; the angle of refraction will be less than 30 degrees. Total internal reflection cannot occur because the white light is traveling from a less dense medium to a denser medium.
 
        
             
        
        
        
Answer:
a.) a = 0 ms⁻²
b.) a = 9.58 ms⁻²
c.) a = 7.67 ms⁻²
Explanation:
a.) 
     Acceleration (a) is defined as the time rate of change of velocity
                         
  
 Given data 
  Final velocity = v₂ = 0 m/s
  Initial velocity = v ₁ = 0 m/s
   As the space shuttle remain at rest for the first 2 minutes i.e there is no change in velocity so, 
                   a = 0 ms⁻²
b.)
      Given data 
As the space shuttle start from rest, So initial velocity is zero
     Initial velocity = v₁ = 0 ms⁻¹
     Final velocity  = v₂ = 4600 ms⁻¹
      Time = t = 8 min = 480 s 
By the definition of Acceleration (a)
               
  
               
                      a = 9.58 ms⁻²
c.)
     Given data
As the space shuttle is at rest for first 2 min then start moving, So initial velocity is zero
     Initial velocity = v₁ = 0 ms⁻¹
     Final velocity  = v₂ = 4600 ms⁻¹
      Time = t = 10 min = 600 s 
By the definition of Acceleration (a)
               
  
               
                      a = 7.67 ms⁻²
 
        
             
        
        
        
Atmospheric pressure is caused by the weight of the atmosphere pushing down on itself and on the surface below it.
Pressure is defined as the force acting on an object divided by the area upon witch the force is acting.