In the above case we can say that power given by external agent to pull the rod must be equal to the power dissipated in the form of heat due to magnetic induction.
Part a)
when we pull the rod with constant speed then power required will be product of force and velocity
here we will have
P = 4 W
v = 4 m/s
now we will have
So external force required will be 1 N
PART B)
now in order to find magnetic field strength we can say
here we know that induced EMF in the wire is E = vBL
so power due to induced magnetic field is given by
by solving above equation we will have
Answer:
Sun light takes 8.5 minutes to reach Earth.
Explanation:
Light travels in vacuum at constant speed 
, so we can find the time it takes to travel the given distance from Earth to Sun using a kinematic equation.
Finding the time it takes for Sun light to reach us.
Using the kinematic equation 
, we can solve for time t, which will give us
We can replace the equation with the given values, but before doing that, we need the values to be on SI units, thus the distance becomes
Replacing the values on the time equation give us
We get as result 510 seconds, then we must convert them in minutes.
So we can conclude that Sun light takes 8.5 minutes to reach Earth.
Because it is acted upon by balanced forces.
Toy cars use a variety of mechanisms to make them go, but they all store up potential energy. Although the elastic material inside is usually steel and not rubber, the principle is the same. By changing the shape of the material (usually a coil of metal) energy is stored and then released as motion.
A car slowing down from 50 miles per hour 20 miles per hour
Answer:
As ambient air pressure decreases, molecules evaporating from a boiling liquid meet less resistance from air molecules and enter the air more easily. Because the vapor pressure can be reduced, the temperature needed to boil the liquid is also reduced.
Explanation:
