# Pre Cal/Vectors

7,718 results

pre cal
Find the angle between the vectors u and v if u=i+4j and v=−i+2j.

Pre-Cal
Use the law of cosines to find the angle of Q between the given vectors. v=3i + j w=2i - j

Use the law of cosines to find the angle Q between the given vectors. v = 3i + j w = 2i - j

Pre Cal
Find the manitude of each vetcor, and write each vector as the sum of the unit vectors. Choose either one (2,6) or (4,-5) Thank you

Pre Cal/Vectors
Can someone show the steps involved in figuring out this type of problem? Given the magnitudes of vectors u and v and the angle Ό between them, find the magnitude of the sum u + v to the nearest tenth and the angle that the sum vector makes with u to the nearest degree. /...

pre cal
Find the angle between the vectors u and v if u = (-1,4) v = (3,-4) a. 155.93 b. 158.58 c. 158.13 d. 155.24 e. 157.17

pre cal
does anyone take pre-cal online ?

Integrated Physics and Chemistry
The specific heat capacity of copper is 0.09 cal/g°C. How much energy is needed to flow into a 10-gram sample to change its temperature from 20°C to 21°C? A)0.009 cal B)0.09 cal C)0.9 cal D)9 cal

math
80 cal/g x 5 g 400g/cal or 400 cal/g not sure can any one help Neither. 80 cal/g x 5g = 400 cal. The unit g cancels to leave calories. x2+2x-15

math
given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the dot product of vectors p and q?

math
given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the product of vectors p and q?

Chemistry/Physics
How much heat is required to raise the temperature of 100 g of lead 20 degrees C? The specific heat of lead is 0.0305 cal/g K. A) 51 cal B) 61 cal C) 71 cal D) 81 cal

Pre-Calculus
I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

Pre-Calculus
I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

Physics
A 150 gram golden (specific heat 0.03 cal/gram^0 C) spoon at 20^0C is placed in a cup of tea at 100^0C. The amount of heat which the spoon absorbs from the tea which is necessary to reach spoon's tempature 47^0C is a)360.4 Cal b)121.5 Cal c)78.24 Cal d)15.08 Cal e)157.5 Cal

Pre-calculus
An expedition walks 4 kilometers from camp on a bearing of 30 degrees, then turns and walks 10 km on a bearing of 160 degrees. Find the magnitude of the new location relative to the beginning location using vectors. -> if you can, can you possibly show how the triangle ...

physics
Can you help me with this one also? I know how to do it with 3 vectors but I can't seem to draw it with 4 vectors. The magnitudes of the four displacement vectors shown in the drawing are A=16.0 m, B=11.0 m, C=12.0 m, and D=26.0 m. Determine the (1) magnitude and (2) ...

Physics
Please help me with this its very hard to visualize the problem. The analytical method of adding vectors expressed in terms of their components may be applied to vectors in three dimensions, for which graphical work is inconvenient. Find the magnitude of the resultant of the ...

Science
A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

physics
A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

Chemistry
How much heat is released when 10 g of steam at 100°C is cooled to 10 g of liquid water at 100°C? I am working on a practice test and the answer is not in the back of the book. Can some one help me. 1. 10 cal 2. 5400 cal 3. 800 cal 4. 6200 cal

chemistry
How many calories are required to heat 25.0 g of platinum from 24.5 °C to 75°C (specific heat of platinum = 0.139 J/gK)? 1. 47 cal 2. 42 cal 3. 48 cal 4. 20 cal 5. 80 cal Thank you.

Pre-Cal
xy=2 {{x^2=3+y^2}}

Pre Cal
1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3

pre cal
3(2x-1)^2 (2) (x+3)^1/2 + (2x-1)^3 (1/2) (x+3)^-1/2

Pre cal
ix^2-2x+i=0

Pre Cal
x 2 + y 2 = 0

pre cal
x^2+bx+ ?=(x+ ? )^2.

pre cal
(x/x-1)-(x/x+1) -2=0

pre cal
1/(x-1)- x/(x+1)-2=0

Physics
A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. How much heat ...

Physics
2 vectors have same magnitude.The magnitude of the resultant vector of these 2 vectors are same as either of both vectors.What is the angle between 2 vectors?

pre - cal
12-5y^2 what's the question?

Pre-Cal
What are bearings??

pre cal
what is the sum of e or 1n

Pre Cal
Solve for x 2^x=8^x-3

pre cal
solve for x 8x-(2x-1)=3x-10

Pre Cal
What is the inverse of g(x)= 1/2(x-1)^3-4

pre cal
(y^2)^-4y^8 simplify

Pre-Cal.
How does this go from x^2+ to 2i, explain.

Pre-Cal
tan-1=43\9.3

Pre-Cal
2y=cos(4(t-6))+6

pre cal
f(x) = 3x + 5, g(x) = 6x^2 Find (fg)(x)

Pre cal
sin55=12/b what is b

Math - Algebraic Vectors
Given the vectors: u = [3, 0] v = [-1, 2] a) Express the vector w = [2, 8] as a linear combination of vectors u and v. How do I do this?

math
two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular

math
two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular

PreCalculus
Given vectors u=7i + 3j and v = -4i + 3j, find 5u-4v in terms of unit vectors. I am just beginning the study of vectors and have this problem. Could someone help? Thanks.

math
if vectors a+b+c=0 and modulus of the vectors a, b and c are 3 ,5 and 7 respectively. find the angle between the vectors a and b.

Chemistry
Which of the following is the correct unit for specific heat? degree C*** Cal cal/g cal/(g*deg C)

Calculus
Name two sets of vectors that could be used to span a set in R^3. Show how the vectors (-1,2,0) and (3,4,0) could each be written as a linear combination of the vectors you have chosen.

Science
2 vectors have same magnitude.The magnitude of the resultant vectors is same as either of both vectors.What is the angle between 2 vectors?

Science -- Check my Answer Plz
How much heat (calories) must be applied to a 100 mL beaker filled with boiling water in order to vaporize the water? ** A) 540 cal ** B) 540 * 10^4 cal C) 800 cal D) 8000 cal Is A correct? or cud it be B.?

pre-cal
find the value(s) of x for which f(x)=g(x). f(x)=x^4-2x^2,g(x)=2x^2

Pre-Cal (again)
If: f(x)= 3/x^2-1 g(x)= x+1 What is the domain of f, g, and f o g?

pre cal
What would cos2theta=-1/2 be???

Pre-Cal
Find f X g 3 sqrt of x+1 X x^3+1

Pre-Cal
Simplify e^3ln2-1

pre-cal
(576^1/2+512^1/3)^1/3

pre-cal
tan((theta/2)+(pi/6))=-1

Pre Cal
simplify the quotient: [x(5x+1)-3(x^2+1)]/ [(x-1)^2]

Pre Cal
cos^2+tan^2=1

Pre Cal
cos 75 deg

pre cal
7tan^2(pheta)-2=3

pre-cal
f(x)=((6xy^3)^1/2)((30x^4y^6)^1/2)/(5x^-7y^4)^1/2

Pre Cal
f(x) = log3(93 x + 3 815 x + 3)

pre-cal
find the intercepts of y=2x-4

Pre-Cal.
f(x)=x^3-3x^2+x-12 =x^2(x-3)+4(x-3) =x^2+4) (x-3) so if f(x) = 0 at x = 3,+/- 2i. what is the f(x) factored form

pre cal

Calculus and Vectors
THE VECTORS a - 5b AND a-b ARE PERPENDICULAR. IF a AND b ARE UNIT VECTORS, THEN DETERMINE a dot b

Math
Let a, b, and c be unit vectors, such that a+b+c=0. Show that the angle between any two of these vectors is 120 degrees. I proved this geometrically, but now my teacher wants a proof using vectors, and I don't know what to do.

PRE-CAL
SIMPLIFY 55/SQUARE ROOT OF 20 -3

pre cal
solve for x: x^(2/3)=(1/27) (2^(x)+4)/(2^x)=2 explain please

Pre-Cal.
Describe the end behavior of f(x)=2x^4-5x+1: A. x-->‡, f(x)-->‡; x-->-‡, f(x)-->-‡ B. x-->‡, f(x)-->‡; x-->-‡, f(x)-->‡ C. x-->‡, f(x)-->-‡; x-->-‡, f(x)-->‡ D. x-->‡, f(x)-->-‡; ...

Pre-Cal
solve(5-x)^-3=8 teach if possibe if not, its ok Thanks

Pre-Cal
Find the inverse of the function f(x) = 3^x+2

Pre-Cal
Identify any asymptotes of the graph. y = 1.08^5x

Pre-Cal
What is the domain of f/g? f(x) = x / x+1 g(x) = x^3 Please explain! Thank you

Pre-Cal
what about the domain of 1/x. Would it be 0?

pre-cal
solve this system of equation 3x-y+5z-2w=-44 x+6y+4z-w=1 5x-y+z+3w=-15 4y-z-8w=58

Pre-Cal
Find the domain for the function f(x)=-2x^(2)÷-x^(2)-6x-27

pre-cal
what is the vertex and directrix of the parabola y=-1/2x^2 + 10 - 46

pre cal
[root2(cos2pi/11+isin2pi/11)]^4

Pre Cal
the function y= tan (x/3) has an x intercept at?

pre cal 2
solve the equation 4cos^2x-1=0

Pre Cal
simplify the quotient: [(x+1)^3(4x-9)-(16x+9)(x+1)^2]/[(x-6)(x+1)^3]

pre-cal
Find B so that F(x)=-x^2+bx-75 has a maximum value of 25.

Pre-Cal
find the value of the function k(p/q)

Pre-cal
Does the equation x^2+x-12/x+2 have holes?

Pre-cal
10.2 can someone show me this graph(x+2)^2/4+(y+2)^2/15=1

Pre cal

pre-cal
solve the equation algebraically. 7e^x=11-e^-x

pre-cal
Find the real zeros of f (x)= 2x^3 + 2x^3 – 8x + 3

pre-cal
Find the real zeros of f (x)= 2x^3 + 3x^2 – 8x + 3

pre-cal
find the distance d (P1 P2) between the P1 and P2 P1=(-1,1);P2=(1,2)

Pre Cal
What is the phase shift of F(x) = 3 sin (2x - 2)?

Pre-cal

Pre-Cal.
write f(x) in factored form.

pre cal
Solve G(x) for the given domain. G(x) = 3x 2 - 2x - 1 G(6) =

pre cal
Find the inverse of the function. f(x) = x3 + 8

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