Answer the following question given this paragraph: Acceleration that does not change in time is called uniform or constant acceleration. The velocity at the beginning of the time interval is called initial velocity, , and the velocity at the end of the time interval is called final velocity, . In a velocity versus time graph for uniform acceleration, the slope of the line is the acceleration. The equation that describes the curve is . Q: The velocity at the beginning of the time interval is called what? Choices: - growing velocity - internal velocity - previous velocity - initial velocity A:
initial velocity
(Question)
Answer the following question given this paragraph: Rainbows are produced by a combination of refraction and reflection. You may have noticed that you see a rainbow only when you look away from the sun. Light enters a drop of water and is reflected from the back of the drop, as shown in Figure 25.24. The light is refracted both as it enters and as it leaves the drop. Since the index of refraction of water varies with wavelength, the light is dispersed, and a rainbow is observed, as shown in Figure 25.25 (a). (There is no dispersion caused by reflection at the back surface, since the law of reflection does not depend on wavelength. ) The actual rainbow of colors seen by an observer depends on the myriad of rays being refracted and reflected toward the observer's eyes from numerous drops of water. The effect is most spectacular when the background is dark, as in stormy weather, but can also be observed in waterfalls and lawn sprinklers. The arc of a rainbow comes from the need to be looking at a specific angle relative to the direction of the sun, as illustrated in Figure 25.25 (b). (If there are two reflections of light within the water drop, another "secondary" rainbow is produced. This rare event produces an arc that lies above the primary rainbow arcsee Figure 25.25 (c). ) Rainbows Rainbows are produced by a combination of refraction and reflection. Q: What colorful arc-shaped atmospheric phenomena are produced by a combination of refraction and reflection? Choices: - lightning - shadows - sunsets - rainbows A:
(Answer)
rainbows
Ques: Answer the following question given this paragraph: Liverworts are small plants that grow close to the ground. Q: Liverworts are small plants that grow close to what? Choices: - houses - beaches - tree tops - ground A:
Ans: ground
(Q).
Answer the following question given this paragraph: A wheel and axle is a simple machine that consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point. When force is applied to the inner axle, the ideal mechanical advantage is less than 1. When force is applied to the outer wheel, the ideal mechanical advantage is greater than 1. Q: What simple machine consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point? Choices: - pully - bloom and axle - spoke - wheel and axle A:
(A).
wheel and axle
Ques:Answer the following question given this paragraph: Gases assume the shape of their container. Q: Which form of matter assumes the shape of its container? Choices: - solids - liquids - crystals - gas A:

Ans:gas
Answer the following question given this paragraph: The three theories below are essential in Earth science. Each accounts for an enormous amount of data. Each is supported by many lines of evidence. All can be used to make predications. As new evidence arises, any of these theories may need to be altered. But none of these three are likely ever to be disproved. They are accepted by nearly all of the credible scientists in their fields. Q: In science, what is supported by much evidence, widely accepted by credible scientists, and unlikely to be disproved? Choices: - law - concept - hypothesis - theory A:
theory