# if A cross B =B cross A, then the angle between them is

48,750 results

1. ### physics

if A cross B =B cross A, then the angle between them is
2. ### Math

There are four people that want to cross a bridge. Sam can cross in 1 minute, Joe can cross in 2, Jack can cross in 5, and Steve can cross in 10. They have one flashlight, and two can cross at a time, but they must go at the same pace. So if Steve and Sam cross together, they ...
3. ### maths magic

There are A,B,C,D at one end of the bridge.they have to cross within 17 minutes.only 2 can cross the bridge at atime .since it is very dark one has to come back to show the light and its said that A can cross the bridge in 1 min ,B can cross at 3min ,C in 5 min and D in 10 min...
4. ### MATH

FOUR CYCLISTS A,B,C&D WANTS TO CROSS A BRIDGE BUT DUE TO BAD CONDITION OF BRIDGE ONLY TWO AT A TIME CAN CROSS IT. IF A TAKES 1 MINUTES, B TAKES 2 MINUTES,C TAKES FIVE MINUTES & D TAKES 10 MINUTES TO CROSS THE BRIDGE, HOW THEY ALL CAN CROSS THE BRIDGE IN 17 MINUTES. IF ONE LAMP...
5. ### Math vectors

For which of the following conditions will the cross product of two vectors be zero? a) If the angle between them is 90°. b) If the angle between them is 0°. c) If the angle between them is 45°. d) If the vectors have the same magnitude.
6. ### managerial economics

Explain the relationship between product X, product Y and product Z or the properties of each according to the following statements a. Cross price elasticity between X and Y is -4 b. Cross price elasticity between X and Y is 12 c. Cross price elasticity between Y and Z is 0 d...
7. ### Vectors

A boat is capable of 20 km/h in still water. You wish to cross the river downstream so that the angle the boat's push makes with the bank is 50 degrees. At what angle to the bank should the boat steer if the current is 8 km/h? How long will it take to cross if the river is 1.7...
8. ### Biology

What is the result of a cross of a heterozygous curly winged fly to a straight-winged fly? (Include both genotype and phenotype with fractions of each) Do I need to make a monohybrid cross or a dihybrid cross?
9. ### Biology

Hi! If I have two plants with the genotypes Rrtt and rrTt where red color(R) is dominant over white(r) and being tall(T) is dominant over being short(t).If I complete a Punnet square, will it look loke this: R r r r t Rt rt T rT rT t rt rt t rt rt How can I diagram a cross ...
10. ### calculus

show that if a, b & c are in v3, then (a cross b) dot [(b cross c)×(c cross a)] = [a dot (b cross c)]^2
11. ### calculus

The cross-section of a drain is a trapezoid. The sides and the bottom of the trapezoid each have a length of 10 feet. Determine the angle θ such that the drain will have maximal cross-sectional area.
12. ### math

i am very confused with the question: when a cross tile is placed on a number chart no matter how large the cross tile becomes the number covered by the centre of the cross-tile is the average of all of the numbers covered.
13. ### Physics

2. We have two vectors that line in the x-y plane. If we take the cross-product of those two vectors we know that a. the magnitude of the cross-product will always be equal to the product of the magnitudes of the two vectors. b. the magnitude of the cross-product will always ...
14. ### cross product

Explain how to solve the proportion 14/9=x/54 using cross products
15. ### Physics

A place kicker must kick the football from a point 34.2 m from the goal and clear a bar 3.00 m above the ground. The ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0 degrees above the horizontal. (a) By how much (m) does the ball clear (positive value) or ...
16. ### Science(Botany)

Consider a monohybrid cross between a pure tall plant and a dwarf plant. In F2 generation of this cross 4000 seedlings were produced. How many seedlings will be tall?
17. ### Science(Botany)

Consider a monohybrid cross between a pure tall plant and a dwarf plant. In F2 generation of this cross 4000 seedlings were produced. How many seedlings will be tall?
18. ### Physics

A man can swim at a speed of 3km/hr in still water. He wants to cross a 500m wide river flowing at 2km/hr. He keeps himself always at an angle of 120¡ãwith the water flow while swimming. Find (A) The time he takes to cross the river (B) The point on the opposite bank where ...
19. ### math

From a square piece of cartolina with a side of 60cm, liza cut the biggest cross. What is the area of the cross?
20. ### Algebra

Four people are on one side of a bridge. All of them need to cross a bridge in order to escape from a pack of zombies. They have 17 minutes before the zombies arrive and all four people must be on the other side of the bridge. It is night and there is one flashlight. A maximum...
21. ### Cross-Multiply

9. Explain the process of cross-multiplication.
22. ### calculus

Find two unit vectors that make an angle of 60° with v = ‹3, 4›. Give your answers correct to three decimal places. I'm not sure what to do here; I believe that I use to definition of a dot product (or maybe cross product) with relation to the trig function (cos for dot, ...
23. ### Grammar...writing

Does this sentence contain an infinitive pharse? Thank You Having risen becaus of the rains, the hikers were unable to cross the river. _______to cross the river________ This is an infinitive phrase in the sentence... correct? Yes, "to cross the river" is an infinitive phrase. =)

Explain why a polymer such as polybutadiene can be cross-linked, however a polymer such as polyethylene cannot be cross-linked. Make reference to what it is about the chemistry of the repeating units that allows for the formation of cross-links.
25. ### science

water flows steadily through a horizontal pipe of non uniform cross section. if the pressure of water is 4*10^4 N/m^2 at a point where the velocity of flow is 2ms^-1 and cross section is 0.02 m^2 what is the pressure at a point where cross section reduces to 0.01m^2?
26. ### BC Calculus

Fluid is flowing in a tube that has a radius of 3 centimeters. Water is flowing through a circular cross section at a rate of (9-r^2) cm/s, where r is the distance from the center of the cross section. What is the total amount of water that flows through the cross section in 4...
27. ### Integrals/Related Rates(?)/Volume

Fluid is flowing in a tube that has a radius of 3 centimeters. Water is flowing through a circular cross section at a rate of (9-r^2) cm/s, where r is the distance from the center of the cross section. What is the total amount of water that flows through the cross section in 4...
28. ### physics

A liquid is under stream lined motion through a horizontal pipe of non uniform cross section of the volume rate of flow at cross section a is v the volume rate of flow at cross section a/2 is Ans:V

prove that normal to plane containing 3 points whose position vectors are a vector,b vector,c vectorlies in direction addition of cross product of vectors b and c and cross product of vectors c and a and cross product of vectors a and b
30. ### science physics

A chicken decides to cross a road. The road is perfectly straight, runs north-south, and is full of cars driving by from south to north. The cars have a log-normal distribution for the distance between each car. However, the cars all travel at 80 km/hr. The chicken stands next...
31. ### Maths

The size of a parcel despatched through the post used to be limited by the fact that the sum of its length and girth (perimeter of the cross section) must not exceed 6 feet. What was the volume of the largest parcel of square cross- section which was acceptable for posting? (...
32. ### Maths

The size of a parcel despatched through the post used to be limited by the fact that the sum of its length and girth (perimeter of the cross section) must not exceed 6 feet. What was the volume of the largest parcel of square cross- section which was acceptable for posting? (...
33. ### Calculus

The size of a parcel despatched through the post used to be limited by the fact that the sum of its length and girth (perimeter of the cross section) must not exceed 6 feet. What was the volume of the largest parcel of square cross- section which was acceptable for posting? (...
34. ### BIOLOGY

A girl crossed a pure short, black haired animal with a pure long, brown haired individual (cross A). The F1 consisted of 10 individuals who had all the same phenotype. She interbred this F1 generation (cross B) and counted the offspring, which consisted of 160 guinea pigs ...
35. ### Genetics/Di hybrid Cross

Can someone show me how to set up this dihybrid cross? The genotypes of the two parents are RRLL' x RWL'L'. The " ' " meaning "prime."
36. ### Economics

Market analysts often use cross-price elasticities to determine a measure of the “competitiveness” of a particular good in a market. How might cross-price elasticities be used in this manner? What would you expect the cross-price elasticity coefficient to be if the market ...
37. ### Math-probability

A sporting goods store estmates that 20% of the students at a nearby university ski downhill and 15% ski cross country. Of those who ski downhill, 40% also ski cross country. What percentage of these students ski both down hill and cross country? Write as a decimal.
38. ### maths

if a vector A has a magnitude 6 and another has a magnitude 7 with an angle 120 in between ,what is its cross product?
39. ### Physics

Find the vector cross product of two vectors C=2i-j and D=i+2j-3k. What is the angle between the vectors
40. ### physics HELP PLS :(

Mark saxby is set to kick the field goal to win the state championship for Olathe East. He is 47.0m away from the goalposts and he kicks the ball at a speed of 25.0m/s at an angle of 30.0 degrees. (a.) If the cross bar on the goalposts is 3.00m above the ground will the ball ...
41. ### English

Why do u think crispin left the cross on Aycliffe even though he he was dead? name of book: crispin the cross of lead
42. ### Mechanics

A boat has a speed of 15ms-1 in still water. It is used to cross a river 500m wide along which there is a strong current of 0.9ms-1. The boat is being directed to the opposite bank, but is carried downstream. Calculate: a) The boat velocity relative to the bank b) The distance...
43. ### Science

A boat has a speed of 15ms-1 in still water. It is used to cross a river 500m wide along which there is a strong current of 0.9ms-1. The boat is being directed to the opposite bank, but is carried downstream. Calculate: a) The boat velocity relative to the bank b) The distance...
44. ### Math - check

Use the cross product to find a vector perpendicular to each of the following pairs. a) (4,0,0) and (0,0,4) I plugged in the cross product formula and got (0, -16, 0)
45. ### Math

The iron cross is a skiing trick in which the tips of the skis are crossed while the skier is airborne. Find the value of x in the iron cross shown.
46. ### physics

Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length of and a square cross section with side length . Bar 2 has an axial length of and a round cross section with diameter. When subjected to axial tension, bar 1 elongates by...
47. ### physics

A piston of cross sectional area 100cm2 is used in hydraulic to exert a force of 10000000dyne find the cross area of another having weight 2000kg
48. ### Statistics

I have a question about one of my Stats vocab questions. any help is great. thanks! Identify the type of observational study as either Cross-sectional or retrospective (just a reminder, Cross-sectional is data measured at one point in time, retrospective is data collected from...
49. ### English

Which of the following sentences is an example of first person narrative voice? A. You were simultaneously exhausted and exhilarated following the cross-country trip. B. The cross-country trip was simultaneously exhausting and exhilarating for him. C. She was simultaneously ...
50. ### physics

A gymnast weighing 72 kg hangs from a cross bar. His coach pushes him forward with a force of 38 N and backward with a force of 20 N. The upward reaction force on the gymnast is 750N. Calculate: i). The resultant (net) force on the gymnast and ii). The angle of the resultant ...
51. ### physics

The intake in the figure has cross-sectional area of 0.75 m2 and water flow at 0.41 m/s. At the outlet, distance D = 180 m below the intake, the cross-sectional area is smaller than at the intake and the water flows out at 9.6 m/s. What is the pressure difference between inlet...
52. ### spc

a long strip of sheet metal 12 inches wide is to be formed into an open gutter with a rectangular cross-section as shown. what is the maximum possible area of the cross-section?
53. ### Calculus

I am asked this: How can you do the cross product of two-dimensional vectors. Well I would have to guess that you just add a 0 in order to follow the cross product method, but this way there is no third component...is this right?
54. ### intro cal

the first 3 term of a geometric progression are k-4, 2k-4, 4k+4. what is the value of k? can someone help please! in any geometric progression any term divided by its previous term gives you the common ratio, so .... (2k-4)/(k-4) = (4k+4)/(2k-4) cross-multiply and proceed. I ...
55. ### Anthropology

Does anyone know how to do a kinship diagram... that sorts out matrilateral cross cousins and patrilateral cross cousins and parallel cousins
56. ### Differential calculus

A gutter with trapezoidal cross section is to be made from a long sheet of tin 8 in wide by turning up one third of its width on each side , what width a cross the top that will give a maximum capacity
57. ### Tilili

Let Vector "A" Cross With Vector "B" Equal To Ten,then Find (A+B) Cross With (A-B) ?
58. ### Chemstry

A 4.1089 g piece of aluminum wire with a circular cross section is 42.06 cm long and has density of 2.6989 g/cm3. What is the volume of the wire and the cross sectional area of the wire in cm2?
59. ### Math

Once there four boys who wanted to cross a street. They were all on the same side. It was night time and they only had one flashlight between them. Only two boys can cross the street at a time, and anyone who crosses , either one or two people, must always have a flashlight ...
60. ### biology

A girl crossed a pure short, black haired animal with a pure long, brown haired individual (cross A). The F1 consisted of 10 individuals who had all the same phenotypes. She interbred this F1 generation (cross B) and counted the offspring, which consisted of 160 guinea pigs ...
61. ### biology, plz help!

A girl crossed a pure short, black haired animal with a pure long, brown haired individual (cross A). The F1 consisted of 10 individuals who had all the same phenotypes. She interbred this F1 generation (cross B) and counted the offspring, which consisted of 160 guinea pigs ...
62. ### psuchics

Reaction at support and internal axial force resultant Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length 1m of and a square cross section 1mm with side length . Bar 2 has an axial length of 3 m and a round cross section ...
63. ### Physic

Reaction at support and internal axial force resultant Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length 1m of and a square cross section 1mm with side length . Bar 2 has an axial length of 3 m and a round cross section ...
64. ### Calculus

A gutter with trapezoidal cross-section is to be made from a long sheet of stainless steel that is 30 cm wide by turning up one-fourth of the width on each side. What width across the top will give the maximum cross sectional area?
65. ### calc

What is the volume of the solid with given base and cross sections? The base is the region enclosed by y=x^2 and y=3. The cross sections perpendicular to the y-axis are rectangles of height y^3.
66. ### physics

a train 100m long is to cross a river bridge of length 800m. what time it take to cross the bridge ?velocity of train is 36km/h.

Find the area of the parallelogram that has the vectors as adjacent sides. u = i + 2j + 2k V = i + k I know that the magnitude of the cross product results on the area. After I do the cross product then what to I do?
68. ### hw

a train 100m long is to cross a river bridge of length 800m .what time will it take to cross the bridge ? given that the train moves with a constant velocity of 36 km/h
69. ### math

when a cross tile is placed on a number chart, the number covered by the centre square is the average of all the numbers covered, no matter how large the cross is. Explain why.
70. ### STATISTICS

The seeds of the garden pea are either yellow or green. A certain cross between pea plants produces progeny in the ratio 3 yellow:1 green. If four randomly chosen progeny of such a cross are examined, what is the probability that: a)3 are yellow and 1 is green b)all 4 are ...
71. ### Math

Robin cross- stitches bookmarks and wall hangings . A bookmark takes her 1 1/2 days, and a wall hanging takes her 4 days. Robin recently spent 18 days cross- stitching 7 items. Solve the system of equations to find the number of bookmarks b and the number of wall hangings w ...
72. ### Humanities

define the following terms for assistance, review the connection, cross currents, and then & now features in Arts and Culture. interdisciplinary connections cultural cross currents transhistorical connections
73. ### Maths Problem solving

when a cross tile is placed on a number chart, the number covered by the centre square is the average of all the numbers covered, no matter how large the cross is. Explain why.
74. ### Physics help ASAP please

a boat can travel 3m/s in still water. a boatman wants to cross a river while covering shortest distance. how long will it take him to cross the river if speed of water is 2m/s
75. ### Calculus

By finding the slopes of the tangent lines to the curve of y=(1/3)x^3+5x at the points where x=3 and x=6, find the acute angle between these lines at the point where they cross. I don't have any idea where to start. An explanation would be appreciated. Please and thanks.
76. ### brain teaser

U2 has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any ...
77. ### biology

consider two plants wuth the genotypes Rrtt and rrTt where red color (R) is dominant over white (r) and being tall (T) is dominant over being short (t). complete the punnett squares to determine the possible ganetes each parent could produce. using the punnet square (16 ...
78. ### maths help

Hi MY question is if a cylinder has a volume of 72cm cubed and a cross-sectional area of 18cm squared. Work out the height of the cylinder Can someone show me how we do it by the steps The volume of a cylinder is given by volume = (cross-sectional area) x height so height = ...
79. ### Math

Use cross products to see if each pair of ratios forms a proportion. Replace each box with a =or a = with a / through the = 1: 7/5 box 10/15= =/ 2:6/8 box 15/20= = I pick the answers because I cross multiply. Idk. The reason why i had picked those that is way i am asking for help
80. ### physics (cross product vectors)

Two vectors are lying in the xz plane: A=2.00i + 3.00k and B= -9.00i + 2.00k. a) What is the value of AxB? Check my solution: I found through calculations that the value is 23j. b) What is the magnitude |AxB|? I could do ABsin theta, but I have no angle between. So am confused...
81. ### Trigonometry

a diagram shows a cross section of a triangular prism. AB=BC=7cm. BM=5cm m is the midpoint of the line segment AC. a) explain why angle AMB must be a right angle. b) calculate angle BCM. c) calculate area of the triangle
82. ### Physics

A jet is circling an airport control tower at a distance of 23.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.49 10-3 radians. Find the distance traveled (in meters) by the jet as the observer ...
83. ### physics

a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.
84. ### physics

a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.
85. ### Algebra 2

A new skateboarder's ramp just arrived at Bungey's Family Fun Center. A cross -sectional view shows that the shape is parabolic. The sides are 12 ft high and 15 ft apart. Write an equation that, when graphed, will show the cross section of this ramp. Is this correct? y=16/75(x...
86. ### social studies

why would Palestinians living in Jerusalem a difficult time traveling to the West Bank? A.they cannot cross national borders B.they will have to cross scarcity barriers C.the roads are too dangerous to travel D.laws prevent travel beyond the city - my answer is b
87. ### physics

Trevor can row a boat at 3.00 mi/hr in still water. He needs to cross a river that is 1.20 miles wide with a current flowing at 1.60 mi/h. Not having his calculator ready, he guesses to go straight across, he should head 60.0 degrees upstream with respect to straight across. a...
88. ### Physics

A plane can travel with a speed of 80 mi/hr with respect to the air. Determine the resultant velocity of the plane (magnitude only) if it encounters a: 10 mi/hr cross wind; 60 mi/hr cross wind; 10 mi/hr tailwind; 10 mi/hr headwind. I have no idea what equation to use to solve ...
89. ### Math

How do you divide fractions??? Cross multiply: For example, 4/5 divided by 6/7 would be 28/30 or 14/15. 3/4 divided by 2/3 would be 9/8 or 1 and 1/8 Actually, the word cross multiply is a misnomer. What is being done is multiplying by the reciprocal for instance 4/5 divide by ...
90. ### Earth Science

Which geologic principle states that if rock strata are found folded or faulted, the folding or faulting occurred after they were deposited? faunal succession uniformitarianism original horizontality cross-cutting relationships Uniformitarianism does not sound right at all for...
91. ### College Calculus

Find the volume of the solid with given base and cross sections. The base is the unit circle x^2+y^2=1 and the cross sections perpendicular to the x-axis are triangles whose height and base are equal.
92. ### Calculus (Cross Section) again

A half of a pepperoni stick is 10 cm long. Assume that a cross section perpendicular to the axis of the pepperoni at a distance x from the end if a circle of radius rad(3x). What is the volume of the pepperoni
93. ### Social Studies

Which key figure in Christianity does this image represent? It is a picture of Jesus tided to a cross A. Peter B. Paul C. Jesus <---- D. God I know that it is Jesus but he never died on a cross, he died on a pole.
94. ### communication

I am doing a power point on red cross and the disaster responses they have this is one thing I would like to cover but can not find anything up to date can anyone help? What are new technology available to enhance disaster preparedness in the red cross organization.
95. ### physics

Water is flowing in a pipe with a circular cross-section area ,and at all point the water completely fills the pipe.At point 1 ,the cross sectiona are of pipe is 0.070 meter square and the fluid velocity is 3.50 meter per second. a.) what is the fluid speed at point in the ...
96. ### biology

) To test linkage between the feather texture and feather color genes you complete a test cross with the F1, and find that the feather texture and feather color genes are linked. Only part of the data from the test cross is given below. Complete the table by giving the four ...
97. ### Science

If C= -5j + 6j - 3k and D= 7i + 8j + 4k are vectors, find: The cross product and its respectively angle
98. ### maths

A large canal will have a cross-section in the shape of an isosceles trapezoid. The top will be twice as wide as the bottom, and the depth will be 8.00 m. Because of the cost of the building materials, the bottom and two slopes sides are to measure 14.0 m altogether. What is ...
99. ### Math

a) prove the identity: Ax(BXC)=B(A*C)-C(A*B) A,B,C vectors x- cross product *-dot product b) use part a) to prove that cross product is not associative.
100. ### Mamthematics - Vectors

a) If vector u and vector v are non-collinear vectors show that vector u, vector u cross product vector v and (vector u cross product vector v) cross product vector u are mutually othogonal. b) Verify this property using vectors collinear with the unit vector, i, j and k c) ...