Given: each railroad car has a mass of 52000 kg. three coupled railroad car moving with a speed of 3.7 m/s collide and couples with four other coupled railroad cars moving in the same direction with an initial speed of 2.4 m/s. what is the speed of all seven cars after the collision? answer in units of m/s.

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

Select the three ways that the parallel-plate capacitor differs from a car battery.