a battery of EMF 4 volt and internal resistance 2 ohm is joined in resistance of 8 ohm. calculate terminal potential difference. What addition resistance in series with 8 ohm resistor would produce a terminal potential difference of 3.6 volt?

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

What is the coefficient of kinetic friction μk between the block and the tabletop?

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.