Science Flashcards
5 cards from real CMAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 5 Science flashcards as text
Curtains in theaters prevent sound waves from being reflected as echoes. Which model best explains why curtains prevent echoes?
Answer: A ball dropped on a surface will bounce more on a hard surface than on a soft surface.
Echoes occur when sound waves reflect off hard, smooth surfaces. Curtains are soft and absorbent, meaning they absorb sound energy rather than reflecting it. This is analogous to a ball bouncing less (or not at all) on a soft surface compared to a hard surface, where it would bounce significantly more, representing reflection.
Which of the following moons of Jupiter is the closest to the planet?
Answer: Io
Io is the innermost of Jupiter's four largest moons, known as the Galilean moons. Its orbital distance is approximately 421,700 km from Jupiter's center, making it closer to the planet than Europa, Ganymede, and Callisto, which orbit at progressively greater distances.
What forces are primarily responsible for keeping the globe floating in place over its base?
Answer: Magnetic force and gravitational force
For a globe to float (levitate) over its base, there must be an upward force counteracting the downward pull of gravity. This upward force is typically provided by magnetic repulsion from magnets within the base and the globe, balancing the gravitational force to keep it suspended in place.
What principle explains why the falling magnets are pushed back up by the magnets at the bottom of the rod?
Answer: Magnetic repulsion
Magnets exert forces on each other, and when like poles (e.g., North-North or South-South) face each other, they repel, pushing each other apart. In this setup, the falling magnets are pushed back up because their poles align with the poles of the stationary magnets at the bottom of the rod in a way that causes magnetic repulsion.
What was the primary purpose of the Voyager 2 mission as indicated by its trajectory through the solar system?
Answer: To study the outer planets and their moons
Voyager 2 was specifically designed and launched to conduct a 'grand tour' of the outer solar system. Its unique trajectory allowed it to visit all four gas giants—Jupiter, Saturn, Uranus, and Neptune—providing unprecedented data and images of these planets and their numerous moons, fulfilling its primary purpose of studying the outer planets.