Acannon on a railroad car is facing in a direction parallel to the tracks. it fires a 98.0-kg shell at a speed of 215 m/s (relative to the ground) at an angle of 60.0° above the horizontal. if the cannon plus car have a mass of 5.00 × 104 kg, what is the recoil speed of the car (relative to the ground) if it was at rest before the cannon was fired? express your answer in m/s.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.