(Q).
Q: Magnetic force is always perpendicular to what? Read this paragraph and choose the correct option from the provided answers: So does the magnetic force cause circular motion? Magnetic force is always perpendicular to velocity, so that it does no work on the charged particle. The particle's kinetic energy and speed thus remain constant. The direction of motion is affected, but not the speed. This is typical of uniform circular motion. The simplest case occurs when a charged particle moves perpendicular to a uniform B -field, such as shown in Figure 22.20. (If this takes place in a vacuum, the magnetic field is the dominant factor determining the motion. ) Here, the magnetic force supplies the centripetal force F c = mv 2 / r . Noting that sin = 1 , we see that. Choices: - speed - sunlight - length - velocity A:
(A).
velocity

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Q: What is the upper most level of earth's layers called? Read this paragraph and choose the correct option from the provided answers: You can't go to the mantle but small pieces of the mantle can come to you. Kimberlite forms deep in the mantle and is erupted violently into the crust. Kimberlite can contain diamonds. Most kimberlites reached the surface much earlier in Earth history. Choices: - surface - volcanic - mantle - crust A:
(A).
crust

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Q: Animals that live in groups with other members of their species are called what? Read this paragraph and choose the correct option from the provided answers: Why is animal communication important? Without it, animals would not be able to live together in groups. Animals that live in groups with other members of their species are called social animals . Social animals include many species of insects, birds, and mammals. Specific examples of social animals are ants, bees, crows, wolves, lions, and humans. To live together with one another, these animals must be able to share information. Choices: - present animals - common animals - energetic animals - social animals A:
(A).
social animals