Answer the following question given this paragraph: 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. Q: Magnetic force is always perpendicular to what? Choices: - speed - sunlight - length - velocity A:
velocity
(Question)
Answer the following question given this paragraph: Q: Name the most famous satellite of the earth? Choices: - demos - skylab - sputnik - the moon A:
(Answer)
the moon
Ques: Answer the following question given this paragraph: Much of the trash in the oceans is plastic. Many types of plastic do not degrade. Some break down into plastic molecules, but these can also be a pollutant. Plastic shopping bags are extremely abundant in the oceans. Since water runs from land into the sea, chemicals can end up in the sea. Pesticides, herbicides, and fertilizers are among the chemicals. Q: Most of the trash in the ocean is made of what material? Choices: - styrofoam - hydrocarbons - wood - plastic A:
Ans: plastic
(Q).
Answer the following question given this paragraph: Metamorphism. This long word means "to change form. " A rock undergoes metamorphism if it is exposed to extreme heat and pressure within the crust. With metamorphism, the rock does not melt all the way. The rock changes due to heat and pressure. A metamorphic rock may have a new mineral composition and/or texture. Q: What is a rock exposed to if it's undergoing metamorphism? Choices: - humidity and pressure - gravity and precipitation - time and energy - heat and pressure A:
(A).
heat and pressure
Ques:Answer the following question given this paragraph: Leaves may vary in size, shape, and their arrangement on stems. Nonflowering vascular plants have three basic types of leaves: microphylls ("tiny leaves"), fronds, and needles. Figure below describes each type. Q: Nonflowering vascular plants have three basic types of leaves: microphylls, fronds, and what other type? Choices: - molds - tubes - stems - needles A:

Ans:needles
Ques:Answer the following question given this paragraph: Chemical reactions in the real world don't always go exactly as planned on paper. In the course of an experiment, many things will contribute to the formation of less product than would be predicted. Besides spills and other experimental errors, there are usually losses due to an incomplete reaction, undesirable side reactions, etc. Chemists need a measurement that indicates how successful a reaction has been. This measurement is called the percent yield. Q: What is the term for proportion of amount of product actually produced in a chemical reaction versus predicted amount ? Choices: - calculus yield - decrease yield - percent impact - percent yield A:

Ans:
percent yield