A 1.00 x 10^4 -kg train car moving due east at 20.0 m/s collides with and couples to a 2.00 x 10^4 -kg train car that is initially at rest. (a) What is the common velocity of the two car train after the collision?
(b) What is the total kinetic energy of the two train cars before and after the collision?

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of