Which of the examples is describing acceleration? * A roller coaster cart is stationary while passengers are loading.
A roller coaster cart slows down as it starts to climb the first hill.
A roller coaster cart is traveling at a constant speed along a straight section of the
track
None of these are examples of acceleration.

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Argon, neon, and xenon are examples of