A roller coaster has a mass of 650 kg. It sits at the top of a hill with height 78 m. If it drops from this hill, how fast is it going when it reaches the bottom? (Assume there is no air resistance or friction.)

Freud theorized that all human behavior is energized by psychodynamic forces?

What is the definition of a molecule? And how are they made?

When in orbit, astronauts experience weightlessness what is this caused by?

Density of some metals Aluminum - 2.75 g mL Magnesium - 1.74 g mL Nickel - 8.80 g mL Tin - 7.28 g mL Roni picks up a sample of a silver, cylindrical-shaped piece of an unknown metal and is told by her teacher to find the identity of it.

Which of the following statements are true concerning electromagnetic waves in a vacuum? Check all that apply Electromagnetic waves travel in a vacuum with a definite and unchanging speed.

The puzzle box is traditionally associated with the work of

A 0.95-kg sample of water at 11°C is in a calorimeter. You drop a piece of steel with a mass of 0.39 kg at 212°C into it.

Let the magnitudes of two displacement vectors be 4 m and 8 m, respectively. If the two vectors are added, the magnitude of the resultant vector. A. is exactly equal to 4 m. B. is exactly equal to 12 m. C. is greater than 12 m. D.

justin pushes basket of toys with 50N of force for 3 meters in 100 seconds. how much work did he do on the basket

In general, what can be said about metals.