Find the unit tangent vector T and the principal unit normal vector N. r(t) = (t2 - 8)i + (2t - 8)j + 7k
A. T = 
i + 
j; N = 
i + 
j
B. T = 
i + 
j; N = 
i - 
j
C. T = 
i - 
j; N = - 
i - 
j
D. T = 
i + 
j; N = 
i - 
j
Answer: B
You might also like to view...
Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = ?/6 to x = ?/2. The cross sections perpendicular to the x-axis are circular disks with diameters running from the curve 
to the curve 
A. (2
- 2) ? - 
B. (
- 1) ? + 
C. 
- 
D. 
- 
Solve the given trigonometric equation by use of a graphing calculator. Use values of x for 0 ? x < 2?.sin x + sin 3x = -cos x
A. 1.57, 1.83, 2.88, 4.71, 6.02 B. 0.26, 1.31, 1.57, 3.40, 4.45, 4.71 C. 1.57, 1.83, 2.88, 4.71, 4.97, 6.02 D. 2.18, 5.32
Determine if a correlation exists at the indicated level of significance.
?? = 0.05
A. Correlation does not exist. B. Correlation exists.
Divide. Write the answer in lowest terms and as a whole or mixed number where possible.
A. 33
B. 4
C. 1
D. 