PLEASE HELP ASAP Chet is creating a catapult that will allow him to propel a ball farther than he is capable of throwing it. As he is creating the device, he finds that that catapult launches the ball straight up into the air. The catapult should propel the ball up and forward to create a trajectory. Which of the following is the best solution to this problem?

A.
leave the design as is because the ball goes higher than he can throw it

B.
make changes to the design to allow it to launch the ball a farther distance

C.
discard the device and begin the engineering process again from the start

D.
leave the design as is but perform more tests to see if the problem improves

What diagram shows the ionic compound of magnesium oxide

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.

What material does not melt at any temperature