The force used to kick the ball is 1000N
The mass of the ball is 0.8 kg
Time is 0.8 seconds
Therefore the velocity can be calculated as follows
F= Mv-mu/t
1000= 0.8(v) - 0.8(0)/0.8
1000= 0.8v- 0.8/0.8
Cross multiply both sides
1000(0.8) = 0.8v
800= 0.8v
divide both sides by the coefficient of v which is 8
800/0.8= 0.8v/0.8
v= 1000m/s
Hence the velocity is 1000m/s
Answer:
20.58 kJ
Explanation:
mass, m = 75 kg
height, h = 28 m
Work = m x g x h
W = 75 x 9.8 x 28
W = 20580 J
W = 20.58 kJ
Thus, the work done is 20.58 kJ.
The resistance of the cylindrical wire is .
Here is the resistance, is the length of the wire and is the area of
cross section. Since the wire is cylindrical .
Comparing two wires,
Dividing the above 2 equations,
Since
The above ratio is
We also have,
The current through the Silver wire will be 4.23 times the current through the original wire.
Answer:
v = 98.4 m/s
Explanation:
As we know that the total angular momentum of the system is conserved
so here we will have
now plug in all data