We're going to take lots of copper wire and wrap it into a coil. The bigger the coil is, the harder this project will be, so let's give it a radius of 10 cm, which is big enough to comfortably fit a frog but not unmanageable. Realistically, we're not going to be able to get more than 10,000 turns of the wire into one place, so let's take that to be our N. How much current will we need to pass through the wire to get the necessary magnetic field in the center of the coil

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?