How long it takes to revolve around the sun
Answer:
F1= 196 N
F2= 392 N
Explanation:
Given:
length of the plank = 2 m
mass of the plank = 20 kg
Weight of the plank = 20 x 9.8 =196 N
Torque due to the weight of the plank with respect to the pivoted end (i.e the end held by the hand) Counter clockwise torque = 196 x cog of wood
= 196 x 1 = 196 Nm
Clockwise torque = F2 x 0.5
for the balanced case
F2 x 0.5 = 196
F2 = 196/ 0.5
F2= 392 N
now,
the net force
Net downward force =Net upward force
F1 + weight of plank = F2
F1 + 196 = 392N
F1 = 392 – 196
F1= 196 N
Electrical power = (voltage) x (current)
Electrical energy = (power) x (time)
Combine those definitions:
Energy = (voltage) x (current) x (time)
Divide each side by (voltage x time), and we have
Current = Energy / (voltage x time)
You told us that
Energy = 1.8 x 10⁷ joules
Time = 1 hour = 3,600 seconds
so we have
Current = (1.8 x 10⁷) / (voltage x 3,600).
If you live in the US, Canada, or Mexico, your voltage is 120 volts.
Current = (1.8 x 10⁷) / (120 x 3,600) = 41-2/3 Amperes
If you live practically anywhere else in the world, your voltage is 240 volts.
Current = (1.8 x 10⁷) / (240 x 3,600) = 20-5/6 Amperes.
Its velocity would be constant