Answer:
The torque is 0.31 Nm. 
Explanation:
Electrical energy, E = 8400 J 
time, t = 1 min
Angular speed, w = 2900 rpm = 303.53 rad/s 
efficiency = 2/3 of input power
The toque is given by  

 
        
             
        
        
        
Answer:
Option (D) is correct.
Explanation:
The balloon lands horizontally at a distance of 420 m from a point where it as released.
Velocity of air balloon along +X axis =10 m/s
velocity of ball=4 m/s along + X axis
the velocity of balloon gets added to the velocity of ball. So the resultant velocity of the balloon=10+4 = 14 m/s
time taken= 30 s
The distance traveled is given by d= v t
d= 14 (30)
d= 420 m
Thus the balloon lands horizontally at a distance of 420 m from a point where it as released.
 
        
             
        
        
        
Answer:
force; distance; energy. 
Explanation:
An impulse can be defined as the net force acting an object for a very short period of time.
Mathematically, impulse is given by the formula;
 
 
An impulse is a force acting over some amount of time to cause a change in momentum. On the other hand, work is a force acting over some amount of distance to cause a change in energy.
Mathematically, work done is given by the formula;
