Vector Components

A 2-dimensional vector has _____________ and ___________ components.

• horizontal; vertical

• positive; negative

• superficial; deep

• long; short

The horizontal and vertical components of a vector are _______________ to each other, forming a 90 degree angle.

• perpendicular

• parallel

• unrelated

Look at Figure 2.6 on page 90. To find the velocity that the truck must maintain to stay beneath the plane, we must know:

• the horizontal component of the plane's velocity

• the vertical component of the plane's velocity

• opposite leg / adjacent leg

• opposite leg / hypotenuse

• adjacent leg / hypotenuse

• adjacent leg / hypotenuse

• opposite leg / hypotenuse

• adjacent leg / opposite leg

• a/b

• a/c

• b/c

According to the fifth paragraph on page 90, what is "the key to solving the problem"?

Look at Figures 2.6 and 2.7 on page 90. A plane is flying at 95 km/h at an angle of 20 degrees relative to the ground while a film crew is riding in a truck below it. How fast must the truck be driven to stay beneath the plane? (The answer can be found on the bottom of page 90.)

• 90 km/h

• 60 km/h

• 85 km/h

Which equation would you use to solve the problem in the previous question? (The answer can be found on the bottom of page 90.)

• cos 20 = v_x / 95

• sin 20 = 95 / v_x

• tan 20 = v_x / 95