Answer:
Explanation:
Given
mass of box is m
speed of box is v
coefficient of friction 
Box is moving at a constant speed i.e. Net Force on box is zero
i.e. Frictional Force and Force Applied are Equal
The Rate at which power is generated is
Answer: 480 kJ
Explanation: Energy = power · time
E = Pt = 4000 W · 120 s = 480 000 J
Answer:
Correct statement will be dragster rounded the curve with constant speed
Explanation:
It is given that his fried says that The dragster rounded the curve with a constant velocity of 100 km/hour
It is a wrong statement because in circular motion velocity will never constant as the direction of speed is always changing
The correct statement will be dragster rounded the curve with a constant speed because speed may be constant in circular motion
Answer:
The average current density at the position of the area.
Explanation:
Current density is the vector whose magnitude is electric current in the cross sectional area. Current density is vector quantity which is measured in amperes. The average current density is dependent on the electric current flow. It has perpendicular direction of flow and scalar magnitude.
