A boy who weighs 30 kg is skateboarding at a speed of 5 m/s. What is the boys kinetic energy? 750 joules
75 joules
150 joules
375 joules

What is the molality of a solution that has 4 mol of kci in 0.800 kg of water

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

When the water vapor cools it condenses select a number that represents his process on the