1. Vectors A and B can be used to define a plane in space. The cross-product of A and B will be at...

Question

1. Vectors A and B can be used to define a plane in space. The cross-product of A and B will be at what angle to this plane? (1) 0 degrees XXXXXXXXXXdegrees XXXXXXXXXXdegrees (4) The angle depends on the angle at which A and B intersect.
2. Can the cross product of two vectors be represented in cylindrical coordinates? (1)Yes (2) No
3. A vector has the coordinates (3, 4, 5). What is the magnitude of this vector? XXXXXXXXXX XXXXXXXXXX
4. Vectors A and B have positive magnitudes, each greater than 1, but the magnitude of their cross product is zero. What is the angle 0 between vectors A and B? (1) 0 degrees XXXXXXXXXXdegrees XXXXXXXXXXdegrees XXXXXXXXXXdegrees

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David · Accepted Answer

1. An isolated system is one in which no external forces act. 

2. Classical mechanics applies to a billiard ball. In general, it applies to everyday objects, 
not molecular size or smaller, for which we require quantum mechanics, or to very large 
objects or objects whose speed is comparable to the speed of light, for which we require 
relativity.
3. From the equation mF a , we see that a 3 kg mass accelerated at 25m / s  requires a 
force of   2 23kg 5m / s 15kg m / s 15 N.     

4.

1. Vectors A and B can be used to define a plane in space. The cross-product of A and B will be at what angle to this plane? (1) 0 degrees XXXXXXXXXXdegrees XXXXXXXXXXdegrees (4) The angle depends on...

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