At the end of the laps, the runner's displacement is zero.
A gravitational force between objects depends on two things- their masses and the distance between them. So the greater the mass and the less distance there is, the more gravitational force and is the mass is less and the distance is great the gravitational force is weak

P = Power
W = Work
Delta T = Change of Time
So:
P = 35 Joules
Delta T = 70 secs
W = ?

* Joule/Sec = Watt
Answer: The power used to do this task was 0.5 Watts.
Because their is nothing at the geographical poles that attracts the magnet
Answer:
The magnetic field at the center of a circular loop is
.
Explanation:
Given that,
Radius = 4.0 cm
Current = 2.0 A
We need to calculate the magnetic field at the center of a circular loop
Using formula of magnetic field

Where, I = current
r = radius
Put the value into the formula



Hence, The magnetic field at the center of a circular loop is
.