Sorry I'm late. Also sorry you couldn't handle any of this on your own.
There's not that much to it. If you ignore friction, then the total energy
is constant.
-- At the top, it's all potential energy, and kinetic energy is zero.
-- At the bottom, potential energy is zero and it's all kinetic energy.
-- Halfway down, it's half potential energy and half kinetic energy.
The real truth is that there's always some friction, friction robs kinetic
energy whenever he's moving, so eventually he stops going up and
down. Then he has to put some muscle energy into it to go some more.
Hello!
1. Answer: D.
2. Answer: A.
3. Answer: C.
4. Answer: I believe the correct answer is A.
5. Answer: D.
6. Answer: B.
7: Answer: C.
I really hope this helped! :)
Answer: Electric current
Explanation :
The direction of the magnetic field produced by an electric current will change when the direction of the electric current changes.
For example :
If a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).
Let the field lines are in the clockwise direction and when the direction of current is reversed then the direction of the magnetic field is in anticlockwise direction.
Answer:
Yes
Explanation:
This is because the interaction between piece of paper and earth.is gravitational while that of piece of paper and rod is electrostatic
Been a while since i've done a problem like this so i might be wrong in the "work" aspect
your system starts with 1200J
you add 700J of heat-
add 700 to 1200
1200+700
and your system does 400J of work
since work is being done by the system, the energy is leaving the system hence you subtract
1900-400
the result is then 1500