The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.r(t) = ti + (
t + 
t2)k
A. ?
B. 0
C. 
D. 
Answer: C
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Find the x- and y-intercepts. If no x-intercepts exist, state so.y = x2 - 3x + 5
A. No x-intercepts, (0, 5)
B. 
, (0, -5)
C. No x-intercepts, (0, -5)
D. 
, (0, 5)
Calculate the flux of the field F across the closed plane curve C.F = xi + yj; the curve C is the circle (x - 3)2 + (y - 10)2 = 121
A. 242? + 33 B. 0 C. 242? D. 2?
Solve the equation in the interval [0, 2?). csc² x - 4 = 0
What will be an ideal response?
Answer the question based on the following situation:An honest coin is tossed 1600 times. The random variable X denotes the total number of heads that come up in the 1600 tosses.What are the chances that X is more than 787?
A. approximately 84% B. approximately 16% C. approximately 25% D. approximately 75% E. none of these