Answer:
Potential energy, PE = 980 J
Explanation:
It is given that :
Mass of the barrel, m = 20 kg
Height above the ground surface, h = 5 m
We have to find the potential energy of the barrel. Potential energy is given by the product of mass of an object, acceleration due to gravity and height above the ground surface.
Mathematically, the expression for potential energy is given by :
PE=mgh
PE= 980 Joules
Hence, this is the required solution.
Answer:
F = 20 N
Explanation:
Given that,
Mass of the football, m = 2 kg
Initial speed, u = 0
Final speed,v = 5 m/s
The time of contact, t = 0.5 s
We need to found the average force applied by the footballer on the football. We can find it using the formula.
So, the required force is 20 N.
Answer:62.5 J
Explanation:
Given
Inductance(L)=5 H
resistance(R)
Voltage(V)=100 V
Current in L-R circuit is given by
and Power=i^2R+Li\frac{di}{dt}[/tex]
For Steady state i.e. at
Energy Stored is