Dot Products of Vectors

Question 1

Find a b if a = 10i + 4j and b = 3i + 4j.a.c.46b.-14d.

Revolt · Accepted Answer

C

Question 2

Find the angle between u = and v = . Round to the nearest tenth of a degree.

Revolt · Accepted Answer

32.5

Question 3

Use the dot product to find when v = .a.-1c.b.-3d.

Revolt · Accepted Answer

C

Question 4

Use the dot product to find when v = -6i.

Revolt · Accepted Answer

6

Question 5

A constant force of F = 47i + 30j moves an object along a vector D = 13i - 8j, where units are in pounds and feet. Find the work done.

Revolt · Accepted Answer

371 foot-pounds

Question 6

Use the dot product to find when v = .a.c.b.10d.-6

Revolt · Accepted Answer

C

Question 7

Find a b if a = 3i + 8j and b = -0.5i - 4j.a.c.b.-33.5d.-30.5

Revolt · Accepted Answer

B

Question 8

What is the minimum force required to prevent a ball weighing 22.6 lb from rolling down a ramp which is inclined at 39.0 with the horizontal?

Revolt · Accepted Answer

14.2 lb

Question 9

Determine whether the vectors u and v are parallel, orthogonal, or neither.u = , v = a.Neitherc.Orthogonalb.Parallel

Revolt · Accepted Answer

A

Question 10

The angle between a 180-pound force F and = 5i + 2j is 30. Find the work done by F in moving an object from A to B.

Revolt · Accepted Answer

839 foot-pounds

Dot Products of Vectors Answers