A 30 cm spring with constant 70 N/m is compressed to 10 cm and placed between two carts. Cart A mass m5kg andmp is unknown. Initially the system is at rest. After it is released it is observed that cart A has three times the velocity of cart B. 1. a) What force must be exerted initially to keep the spring compressed? b) What is the work done to compress the spring? c) By considering conservation of momentum determine the mass m d) By considering conservation of energy find the velocities of the carts A and B after the spring is released

A12-kg bag of groceries is tossed onto a table at 4.0 m/s and slides to a stop in 2.2 s . modify the equation fδt=δ (mv) to find the force of friction.

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?