HELPPercussion instruments are musical instruments that make noise when they are hit with an object. Which of these are percussion instruments? Check all that apply.

a clarinet, which makes sound when air is blown into a woodwind mouthpiece

a drum, which makes sound when a mallet hits its surface

a cymbal, which makes sound when it is crashed against another cymbal

a trumpet, which makes sound when air is blown into a brass mouthpiece

a violin, which makes sound when a bow slides across strings

An uncovered pot of water lies out in the sun. which statements correctly describe what happens at the surface of the liquid water? 1. the vapor pressure remains constant regardless of the water temperature. 2. the vapor pressure is produced by water molecules that have evaporated. 3. the vapor pressure increases as the sun heats the water in the pot. 4. evaporation stops once the vapor pressure reaches a certain point. 5. evaporation and condensation both occur on the liquid’s surface.