Answer:
The energy transformations that occur is Mechanical → electrical → light.
Explanation:
- When the water falls through the dam the gravitational potential energy of water is transformed into kinetic energy.
- This energy rotates the turbine (mechanical energy) connected to a generator.
- Now this mechanical energy is converted into electrical form through the process of electromagnetic induction (when a conductor cuts the magnetic field, electricity is produced).
- The electricity thus produced is driven to different offices and houses through wires.
- By drawing this current we light our homes and offices.
-- Gold is a more dense substance than iron. At 19.3 times the density
of water, it's in the top few most dense substances in all of nature.
The density of iron is only 7.87 ... only 40% the density of gold !
-- Density doesn't depend on how much of the substance you have.
A flake of gold foil is still more dense than an iron battleship.
Answer:
8 Newton
Explanation:
Weight = force
then, given,
weight= 0.495 kg
force= 7.28 N
Now,
the total force acting on the bird = (Weight + force)N
=(0.495 + 7.28)N
=8N
hence, the total force acting on the bird is 8 N.
Explanation: Solution
1.
Gravitational potential energy
U=mgh=500*9.8*50
U=245000 J
2.
Kinetic energy is present at bottom of the hill
K=(1/2)mV2=(1/2)*500*27.82
K=193210 J
3.
Work done by friction
W=193210-245000=-51790 J
