A body slides down a 30 degree slope with zero initial velocity. A second, 45 degree slope faces the first slope, so the body will slide up that slope after reaching the bottom of the first. Assuming that the body can change between slopes smoothly and that there is no friction, what height will the body reach on the second slope?

The two arrows in the figure show two thermodynamic processes of a certain amount of ideal gas. The dashed line is a hyperbola. Which of the following statements is not true?

Three objects are moving along a circle. The graph shows their speed as a function of time. Which of the following statements is true?

A negatively charged plastic rod is brought near the ball of an uncharged electroscope. Does the electroscope react to that?