Arail gun uses electromagnetic forces to accelerate a projectile to very high velocities. the basic mechanism of acceleration is relatively simple and can be illustrated in the following example. a metal rod of mass 50.0 g and electrical resistance 0.300 \omega rests on parallel horizontal rails that have negligible electric resistance. the rails are a distance l = 7.00 cm apart. the rails are also connected to a voltage source providing a voltage of v = 5.00 v.
the rod is placed in a vertical magnetic field. the rod begins to slide when the field reaches the value b = 0.210 t. assume that the rod has a slightly flattened bottom so that it slides instead of rolling. use 9.80 m/s^2 for the magnitude of the acceleration due to gravity.
find mu_s, the coefficient of static friction between the rod and the rails.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.