Object a is stationary while objects b and c are in motion. forces from object a do 20 j of work on object b and -5 j of work on object c. forces from the environment do 4 j of work on object b and 8 j of work on object c. objects b and c do not interact. what are δktot and δu if (a) objects a, b, and c are defined as separate systems and (b) one system is defined to include objects a, b, and c and their interactions?

A-of 75 cm by cm by 17.5 cm up. of is 2 kg a , in ,if it is in , kg/?

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c