Corey's Christmas tree ornament is falling to the floor. Diagram A shows a box with a downward arrow. Diagram B shows a box with an upward arrow. Diagram C shows a box with a downward and upward arrow equal in size. Diagram D shows a box with a downward and upward arrow with the downward arrow larger in size.

Which free-body represents Corey's tree ornament? You may neglect the effects of air resistance.

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?

Five structural isomers have the formula c6h14. where needed, draw the structure and give the iupac name of all five isomers.