Answer:
(a) 89 m/s
(b) 11000 N
Explanation:
Note that answers are given to 2 significant figures which is what we have in the values in the question.
(a) Speed is given by the ratio of distance to time. In the question, the time given was the time it took the pulse to travel the length of the cable twice. Thus, the distance travelled is twice the length of the cable.

(b) The tension,  , is given by
, is given by

where  is the speed,
 is the speed,  is the tension and
 is the tension and  is the mass per unit length.
 is the mass per unit length.
Hence,

To determine  , we need to know the mass of the cable. We use the density formula:
, we need to know the mass of the cable. We use the density formula:

where  is the mass and
 is the mass and  is the volume.
 is the volume.

If the length is denoted by  , then
, then


The density of steel = 8050 kg/m3
The cable is approximately a cylinder with diameter 1.5 cm and length or height of 620 m. Its volume is




 
        
             
        
        
        
When Trinity pulls on the rope with her weight, Newton's Third Law of Motion tells us that the rope will <u>"pull back".</u>
Newton's third law of motion expresses that, at whatever point a first question applies a power on a second object, the first object encounters a power meet in extent however inverse in heading to the power that it applies.  
Newton's third law of movement reveals to us that powers dependably happen in sets, and one question can't apply a power on another without encountering a similar quality power consequently. We once in a while allude to these power matches as "action-reaction" sets, where the power applied is the activity, and the power experienced in kind is the response (despite the fact that which will be which relies upon your perspective).
 
        
                    
             
        
        
        
<u>Answer:</u>
The power and voltage are related through Power Rule
.
<u>
Explanation :
</u>
Power Rule  states  that the current I  that flows the element in the circuit  with a loss in voltage V,  then the amount of  power dissipated  by that element in the circuit is the   multiplicative product of  voltage and the current.
Mathematically, power law  is

The rate of work done or the rate of energy consumption or production is  termed as power.Unit of power is denoted as W(watts).
Potential energy between  any two points on a circuit is called as  Voltage and is measured in volts (V)
.
 
        
             
        
        
        
 Answer:
The coefficient of static friction between the car and the track
u=0.572 
Explanation:
We don't know the mass of the car or any other information so the acceleration is the reason to solve the friction coefficient 
∑
As we know 

Also the center ward direction forces 



But now vt relation with the tangential acceleration 

replacing 


So magnitude of the force can get by 

Get the factor to simplify 


Solve to u'


 
        
             
        
        
        
The answer is B as all the other options contain quantities not related to describing motion