Hold a small piece of paper (e. g., an index card) flat in front of you. the paper can be thought of as a part of a larger plane surface.
a. what single line could you use to specify the orientation of the plane of the paper (i. e., so that someone else could hold the paper in the same, or in a parallel, plane)?
b. the area of a flat surface can be represented by a single vector, called the area vector a. what does the direction of the vector represent? what would you expect the magnitude of the vector to represent?
c. place a large piece of graph paper flat on the table. describe the direction and magnitude of the area vector, a, for the entire sheet of paper. describe the direction and magnitude of the area vector, da, for each of the individual squares that make up the sheet.
d. fold the graph paper twice so that it forms a hollow triangular tube. can the entire sheet be represented by a single vector with the characteristics you defined above? if not, what is the minimum number of area vectors required?
e. form the graph paper into a tube as shown. can the orientation of each of the individual squares that make up the sheet of graph paper still be represented by da vectors as inabove? explain.
f. what must be true about a surface or a portion of a surface in order to be able to associate a single area vector a with that surface?
Answers: 3
Physics, 22.06.2019 19:10
3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0
Answers: 2
Physics, 22.06.2019 23:00
As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "
Answers: 1
Hold a small piece of paper (e. g., an index card) flat in front of you. the paper can be thought of...
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