When a 219.39-kg crate is pulled across a frictionless horizontal floor with a force of 800 N, directed 30° above the horizontal, the magnitude of the normal force of the floor on the crate is:a. 1560 Nb. 380 Nc. 680 Nd. 580 Ne. 1750 N

In a system, when potential energy decreases, then entropy also decreases. true false

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)