For the following exercises, vectors u and v are given. Find the magnitudes of vectors u - v and -2u . 89. u = 〈 2 cos t , − 2 sin t , 3 〉 , v = 〈 0 , 0 , 3 〉 , where t is a real number.
For the following exercises, vectors u and v are given. Find the magnitudes of vectors u - v and -2u . 89. u = 〈 2 cos t , − 2 sin t , 3 〉 , v = 〈 0 , 0 , 3 〉 , where t is a real number.
For the following exercises, vectors
u
and
v
are given. Find the magnitudes of vectors
u
-
v
and
-2u
.
89.
u
=
〈
2
cos
t
,
−
2
sin
t
,
3
〉
,
v
=
〈
0
,
0
,
3
〉
,
where
t
is a real number.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
1- Let A = {A1, A2, ...), in which A, A, = 0, when i j.
a) Is A a π-system? If not, which element(s) should be added to A to become a π-system?
b) Prove that σ(A) consists of the finite or countable unions of elements of A; i.c., A E σ(A) if and
only if there exists finite or countable sequence {n} such that A = U₁An (Hint: Let F be such
class; prove that F is a σ-filed containing A.)
c) Let p ≥ 0 be a sequence of non-negative real numbers with Σip₁ = 1. Using p₁'s, how do you
construct a probability measure on σ(A)? (Hint: use extension theorem.)
2- Construct an example for which P(lim sup A,) = 1 and P(lim inf An) = 0.
3. Let
f(z) =
sin (22) + cos (T2)
2(22+1)(z+1)
Compute f(z)dz over each of the contours/closed curves C1, C2, C3 and C4 shown
below.
Don't use any Al tool
Don't send the same
previous answer that
was Al generated
L
10
-c
x
show ur answer
pe
n and paper then take
Send ur answer in pe
n and paper don't rep
uted ur self down
PLEASE SOLVE STEP BY STEP WITHOUT ARTIFICIAL INTELLIGENCE OR CHATGPT
SOLVE BY HAND STEP BY STEP
4.- A beer at an unknown temperature is introduced into a refrigerator that has a constant temperature of 1°C. After 20 minutes, the temperature of the beer is 10°C, and after 40 minutes, the temperature of the beer is 6°C.
a) Determine the temperature at which the beer was placed inside the refrigerator.b) How long will it take for the beer to reach 2°C?