Answer:

Explanation:
Given:
- mass of vehicle,  
- radius of curvature,  
- coefficient of friction,  
<u>During the turn to prevent the skidding of the vehicle its centripetal force must be equal to the opposite balancing frictional force:</u>

where:
 coefficient of friction
 coefficient of friction
 normal reaction force due to weight of the car
 normal reaction force due to weight of the car
 velocity of the car
 velocity of the car

 is the maximum velocity at which the vehicle can turn without skidding.
 is the maximum velocity at which the vehicle can turn without skidding.
 
        
             
        
        
        
Answer:
 =6.5%
 =6.5% 
 
Explanation:
Mass of the ball:  ]
]
Initial velocity of the ball:   
final velocity of the ball:  which is -30/100 of
 which is -30/100 of  =
 =
Mass of the bottle: 
Initial velocity of the bottle: 
final velocity of the bottle:  is unknown (to find)
 is unknown (to find)
<em>by using conservation momentum, which stated that the initial momentum is equal to the final momentum.</em>
<em /> <em />
<em />
<em>so since the bottle is at rest firstly, therefore </em> <em />
<em />
<em /> <em />
<em />
<em /> <em>         </em><em>equation 1</em>
<em>         </em><em>equation 1</em>
so now substitute  into equation 1
 into equation 1

<em /> <em />
<em />
<em>collect the like terms</em>


divide both  side by 

Now substitute

 6.5%
6.5%
<em />
 
        
                    
             
        
        
        
Answer:
1.1299 x 10^-8   second    
Explanation:
Period = 1 / f = 1 / (8.85 * 10^7) = 1.1299 x 01^-8  sec
 
        
             
        
        
        
The correct answer is: 
<span>C)	The actual frequency of the siren does not change despite appearances.
In fact, Bob will observe an increase in the apparent frequency as the emergency vehicle approaches him, while Jill will observe a decrease in the apparent frequency as the emergency vehicle moves away from him, because of the Doppler effect (the relative velocity between the observer and the source of the sound is changing), but this effect involves the apparent frequency, while the real frequency of the siren will remain the same.</span>
        
                    
             
        
        
        
Answer:
A person climbs a set of stairs
Explanation:
Potential energy is said to be possessed by an object due to its position. As the height from the ground level increase, the potential energy increases. It is calculated by the below formula as :
P = mgh
Out of the given options, the option that illustrates an increase in potential energy is option (b) i.e. a person climbs a set of stairs. As he steps one stair, its position from ground increases. It means its potential energy increases.