Problem:OPTIONS:
- position vector
- track vector
- gravity vector
- field vector

Answer the following question given this paragraph: Since the force on a charged particle in a magnetic field is always perpendicular to both its velocity vector and the field vector (check this using the second right hand rule above), a constant magnetic field will provide a centripetal force --- that is, a constant force that is always directed perpendicular to the direction of motion. Two such force/velocity combinations are illustrated above. According to our study of rotational motion, this implies that as long as the particle does not leave the region of the magnetic field, it will travel in a circle. To find the radius of the circle, we set the magnitude of the centripetal force equal to the magnitude of the magnetic force and solve for :. Q: The force on a charged particle in a magnetic field is always perpendicular to both its velocity vector and the? A:
****
A: field vector

Problem:OPTIONS:
- weight
- centrifugal force
- motion
- gravity

Answer the following question given this paragraph: For a star to form, gravity pulls gas and dust into the center of the nebula. As the material becomes denser, the pressure and the temperature increase. When the temperature of the center becomes hot enough, nuclear fusion begins. The ball of gas has become a star!. Q: For a star to form, what force pulls gas and dust into the center of the nebula? A:
****
A: gravity

Problem:OPTIONS:
- air
- trees
- land
- ocean

Answer the following question given this paragraph: Mollusks live in most terrestrial, freshwater, and marine habitats. However, the majority of species live in the ocean. They can be found in both shallow and deep water and from tropical to polar latitudes. They have a variety of ways of getting food. Some are free-living heterotrophs. Others are internal parasites. Mollusks are also eaten by many other organisms, including humans. Q: Where do the majority of species live? A:
****
A: ocean

Problem:OPTIONS:
- chemotherapy
- digestive therapy
- oxygen therapy
- viral therapy

Answer the following question given this paragraph: In a similar fashion, viral therapy uses viruses to genetically modify diseased cells and tissues. Viral therapy shows promise as a method of gene therapy and in the treatment of cancer. Gene therapy is the insertion of genes into a person's cells and tissues to treat a disease. In the case of a genetic disease, the defective gene is replaced with a working gene. Although the technology is still new, it has been used with some success. Q: Which therapy uses viruses to genetically modify diseased cells and tissues? A:
****
A:
viral therapy