Posts by Bob

Total # Posts: 3,363

Physics
A block with a weight of 3.7 N is launched along a slope upwards by a spring with k = 2.25 kN / m. The slope makes an angle of 30° with the horizontal and has a vertical height of 0.75 m (measured from the starting point of the block). When the block is released, the ...

Physics
A placekicker kicks a football with a velocity of 35 m/sec and an angle of 25? above the horizontal. When the football is 10 m off the ground, a. What is the horizontal velocity of the ball? b. What is the vertical velocity of the ball? c. What is the total velocity of the ...

Physics
A flight attendant pulls her 66 N flight bag a distance of 359 m along a level airport floor at a constant velocity. The force she exerts is 42 N at an angle of 54° above the horizontal.

math
idk I have to identify the property of real numbers and that was one of my problems. I don't understand any of the properties. please steve.

math
what is the property of 7(2-p)=14-7p

math
Thanks, i can write that is 25^2 right?!?

math
omg thank you!! 40^2 is 1600. Wow that helps alot!!!

math
i dont know why there is a little 2 next to the numbers its the beginning of my lesson

math
7^2 + 24^2 =??? Please someone help!!!!!

math
thank you steve

math
An old lady has 125 cats. Seven of them are old, 9 of them are her favorite, 5 of them are both (old and favorite). How many of are neither old nor favorite?

physics
A sled loaded with bricks has a total mass of 17.0 kg and is pulled at constant speed by a rope inclined at 20.0o above the horizontal. The sled moves a distance of 17.0 m on a horizontal surface. The coefficient of kinetic friction between the sled and surface is 0.420 . (a) ...

Finite Math
An urn contains 55 green marbles and 44 red marbles. One marble is? removed, its color? noted, and not replaced. A second marble is removed and its color is noted. ?(a) What is the probability that both marbles are green?? red?? ?(b) What is the probability that exactly one ...

Chemistry
Silver(I) nitrate and sodium sulfate react to form silver(I) sulfate and sodium nitrate. Suppose 49.02 mL of 0.040 M silver(I) nitrate solution and 39.48 mL of 0.10 M sodium sulfate solution are mixed. What is the maximum number of grams of silver(I) sulfate that can be made?

Trigonometry
Quick question, how would I solve this through trig

Trigonometry
Quick question, how would I solve this through trig

Trigonometry
Two students are passing a ball back and forth, allowing it to bounce once between them. If one students bounce passes the ball from a height of 1.4 m and it bounces 3 m away from the students, where should the second student stand to catch the ball at a height of 1.2 m? ...

Pre Calculus
Find all $2 \times 2$ matrices $\bold{A}$ that have the property that for any $2 \times 2$ matrix $\bold{B}$, \[\bold{A} \bold{B} = \bold{B} \bold{A}.\]

Pre Calculus
For a vector $\bold{v}$, let $\bold{r}$ be the reflection of $\bold{v}$ over the line \[\bold{x} = t \begin{pmatrix} 2 \\ -1 \end{pmatrix}.\] [asy] unitsize(1 cm); pair O, V, R; O = (0,0); V = (3,1); R = reflect(O,(2,-1))*(V); xaxis(-2,4); yaxis(-3,1); draw((-1)*(2,-1)--2*(2,-...

Pre Calculus
Let $\bold{w} = \begin{pmatrix} 2 \\ -1 \end{pmatrix}$. There exists a $2 \times 2$ matrix $\bold{P}$ such that \[\text{proj}_{\bold{w}} \bold{v} = \bold{P} \bold{v}\] for all 2-dimensional vectors $\bold{v}$. Find $\bold{P}$.

Pre Calculus
Find the 2 x 2 matrix A such that pmatrix{(-1,-1)(1 -1)} A = I, where I is the 2 x 2 identity matrix.

science
I need an acrostic on the word eukaryotic

algebra
1. solve 2x + y = 7 for y 2. solve 2y - 18x = 26 for y 3. solve 20x + 5y =15 for y 4. solve 9x - y = 45 for y 5. solve 6x - 3y = -6 for y 6. solve 4x - 5 = 7 + 4y for y

algebra
solve y - 3x = 13 for y

Math
Laverne starts counting out loud by 5's. She starts with 7. As Laverne counts, Shirley sums the numbers Laverne says. When the sum finally exceeds 5000, Shirley runs screaming from the room. What number did Laverne last say before Shirley flees?

social studies
Which of the following statements is accurate regarding the Three-Fifths Compromise and the issue of slavery?

math
A serving of ice cream contains 1200 calories. One hundred forty-four calories come from fat. What percent of the total calories come from fat?

HELP plz
I would say c

math
am I right Mrs.sue

math
HE USED 21 LIGHTBULBS . BEUASE 12 THINGS IS A DOZEN AND 12x3=36. THEN I DID 36-15=21.

Physics
A boat leaves the shore of a stream. It starts directly across from point A, as shown. The velocity of the boat is 5.2 m/s, at an angle ? = 25E as shown. The stream is 94 meters across, and is moving at 1.5 m/s. How far downstream from point A does the boat land? Round your ...

Physics
An aircraft travels 250 km on a heading of 330 degrees. It then turns due east and travels 420 km. How far and on what heading did it end up from it's starting point? Please help!!!

math
You conduct an experiment of dice rolling and roll a six 14 times out of 56 rolls. Write both the experimental probability and the theoretical probability in fraction and percent form.

geometry
The two non-parallel sides of an isosceles trapezoid are each 7 feet long. The longer of the two bases measures 22 feet long. The sum of the base angles is 140°. a. Find the length of the diagonal. b. Find the length of the shorter base. Round your answers to the nearest ...

geometry
Steve it was wrong.

geometry
George plans to cover his circular pool for the upcoming winter season. The pool has a diameter of 20 feet and extends 12 inches beyond the edge of the pool. A rope runs along the edge of the cover to secure it in place. a. What is the area of the pool cover? b. What is the ...

math
what is the answer for it

SAT Math
Thank you Damon.

SAT Math
If x/w=28 and 5yw=3, then xy=?

Us history
Which of these is an example of a monetary incentive A. Having fun walking a dog B. Making friends on a sports team C. Learning a new skill by studying it D. Earning a allowance for doing chores

Personal Finance
I believe The Answer is D

Personal Finance
Which type of computation would a person use to determine current value of a desired amount for the future? A. Present value of a series of deposits B. Future value of a single amount C. Future value of a series of deposits D. Present value of a single amount

HELP
why are cherry blossoms called cherry blossoms if they don't have cherries

science
why are cherry blossoms called cherry blossoms

studies
Why was inflation a problem after World War II?

Math
When Alina was hungry she ate c cookies, which was 30% of all the cookies she had. How many cookies did she have in the beginning?

Math
There were d passengers in the train. 15% of all of them went in the first car, 20% went in the second car. How many passengers were in the rest of the train?

Math
This 3 demensional shape has 7 faces that are rectangles as well as two bases that are polygons. What is this shape ?

Math
This 3 demensional shape has 7 faces that are rectangles as well as two bases that are polygons. What is this shape ?

Geometry
This 3 dimensional shape has 6 faces that are triangles as well as one base that is a polygon. what is this shape?

Math
I am a 3 dimensional shape whose 8 faces are equilateral triangles. What am I?

5th Grade English Grammar
Are the answers: colorful, more colorful, most colorful late, later, latest northern, more northern, most northern troubled, more troubled, most troubled straight, straighter, straightest friendly, more friendly, most friendly dry, drier, driest safe, safer, safest useful, ...

5th Grade English Grammar
worst is worst, worst, worst?

5th Grade English Grammar
positive comparative superlative for troubled, straight, friendly, dry, safe, useful, flat, willing, blue, worst, and sad. Thanks.

Math
Let's say you flip 2 coins simultaneously. There are 3 possible outcomes: Both are heads, both are tails, or one is heads and the other is tails. Does this mean that the probability of getting one head and one tail is 1/3?

Math
Let's say you flip 2 coins simultaneously. There are 3 possible outcomes: Both are heads, both are tails, or one is heads and the other is tails. Does this mean that the probability of getting one head and one tail is 1/3?

Calculus
Consider the equation xy2 ? x2y = 6. (a) Find all points on the graph when x = 2. (b) Find a formula for dy dx in terms of x and y. (c) Find the tangent lines for the points you found in the ?rst part

Caclulu
consider the function f(x) = 9/x^3 -10/x^7 let F(x) be the antiderivatice of f(x) with F(1)=0 then F(x)=

Caclulus
A particle is moving as given by the data below 4sin(t)-3cos(t); s(0)=0

Calculus
A particle is moving as given by the data below 4sin(t)-3cos(t); s(0)=0

Calculus
consider the function f(x) = 9/x^3 -10/x^7 let F(x) be the antiderivatice of f(x) with F(1)=) then F(x)=

Calculus
Consider the function f(x)= x^3+5 sqrt(x) Let F(x) be the antiderrivative of f(x) with F(10=-9

Calculus
Find the anti derivative for 4/(x^2+1)

Calculus
Apply the concepts of calculus (limits and derivatives) to describe the graph y = sec(x). Include a quality graph

Chemistry
1. The decomposition of acetaldehyde is a second order reaction with a rate constant of 4.71 × 10^?8 L/mol/s. What is the instantaneous rate of decomposition of acetaldehyde in a solution with a concentration of 5.55 × 10^?4 M? 2. The rate constant for the first-...

Calculus
Find all solutions to the equation with 0 is less then or equal to a is less then or equal to 2pi Give an exact answer if possible, otherwise give value(s) ofa accurate to at least four decimal places. 4tan(a)+5=2 a= how do i find a

Trigonometry
That doesnt really help me solve for theta

Trigonometry
If possible find a solution to 2 cos(theta)=-0612. theta=

Calculus
Find all solutions to tan(theta)=1/sqroot(3). In the interval 0 less then or equal to theta less then or equal to 2pi. Theta=

Calcalus
Solve the equations below exactly Give your answers in radians, and find all possible values for t If there is more than one answer, enter your solutions in a comma separated list (a) sin(t)= sqroot(2)/2 when t= (b) cos(t)=1/2 when t= (c) tan(t)=-1 when t=

Calculus
If cos of theta= -7/12 and theta is in quadrant 2 then find a. tan(theta) cot (theta)= b. csc(theta) tan(theta)= c. sin^2(theta)+ cos^2(theta)=

Algebra 2
Claire has borrowed $\$5,\!000$. She plans to pay off the loan in full after two payments. She will make one payment in 3 years, then another payment in 6 years. The second payment will be exactly double the amount of the first payment. How much is the first payment if the ...

Algebra 2
Claire has borrowed $\$5,\!000$. She plans to pay off the loan in full after two payments. She will make one payment in 3 years, then another payment in 6 years. The second payment will be exactly double the amount of the first payment. How much is the first payment if the ...

English
Is under a preposition? True or False.

Math
hjd

precalc
Suppose that u=log(2) and v=log(5). Find possible formulas for the following expressions in terms of u and/or v. Your answers should NOT involve any log's. a) log(0.4)= b) log(0.08)= c) log(2500)=

math
24sqrt3-36

science
Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...

Math
your cousin borrow 5000 at an interest rate of 7.5% and the rest at an interest rate of 12% the total paid is 819 . how much did your cousin borrow at each rate

Math
Describe a real world situation that could be represented by planes slicing a three dimensional figure to form cross sections

Calculus
In 1979, a biologist Reto Zach published a study on how crows drop whelks, a type of mollusk, from a height that minimized the amount of energy spent to break open the shells. Drop from too low a height, and the bird has to pick the shell up many times before it breaks. Drop ...

Calculus
Quotient Rule: Use the limit definition of the derivative to prove that the quotient rule

math
Steve is correct

Social Studies
Actually the answers are A C D I got 2/3 for >..< answer but for connexus it's 100% correct :)

Social Studies
Actually the answers are A C D I got 2/3 for >..< answer but for connexus it's 100% correct :)

Mechanical principles
A car initially at rest experiences uniform acceleration of 5 m/s2 for 6 sec. It maintains constant velocity for 14 sec and is then brought to rest in 5 sec by a uniform retardation. a) Using the formula, find out how far the car has travelled. b) Find the total angular ...

Data
Bridget works part time in a shoe store. Sometimes when it is not busy, she rearranges the shoes for fun. If she takes six different pairs of shoes and rearranges them in a row, in how many ways can she rearrange them so that no two shoes match? Is the answer 478 955 520 or ...

Math ASAP
In a survey, one out of three people named blue as their favorite color. Two out of seven named red. If 1,092 people were included in the survey, how many named neither blue nor red as their favorite color? A. 416 people B. 432 people C. 540 people D. 512 people

Math
2. Write a ratio for the situation in three ways comparing the first quantity to the second quantity. In union City, about one in every three homes has two cars A. 5 to 2, 5:2, 5/2 B. 1 to 3, 1:3, 1/3 C. 5 to 3, 5:3, 5/5 D. 3 to 2, 3:2, 3/2

math
A window in a building is 15.0m above the ground. From this window the angle of elevation to the top of the second building is 32degrees and the angle of depression to the bottom of the second building is 17degrees. What is the height of the second building? -diagram needed ...

math
The table shows the number of people that went to see a movie last week. Use these statements to complete the table. On Thursday, 60% of the moviegoers were male. On Friday, 35% of the moviegoers were male. On Saturday, 70% of the moviegoers were female. On Sunday, 45% of the ...

Dating with Radioactivity
TruthOverload is 100% right! Just took the test!

Math
A company runs food service concessions for sporting events throughout the country. Their marketing research department chose a particular football stadium to test market a new jumbo hot dog. It was found that the demand for the new hot dog is given approximately by p=6?ln(x),...

Math
Abby has 45 dogs and ciara has 8000 dogs.Add the dogs 8000 +. 45

science
This question can not be answered as you need to know the mass (or weight, since we're on earth) of the stone: PE = mass x height x acceleration KE = mass x velocity^2 / 2

math
This equation is known as the slope intercept equation, usually written as y = mx + b, that represents straight lines on a graph. The value of m = 3/5 and represents the slope of the line or the angle at which the line is drawn, while the value of b = 6 means the line crosses ...

Meth
Yes

world history
1. Which of the following would Locke most Favor? A. Republic B. Oligarchy C. Theocracy D. Absolute monarchy

Science
In a chemical compound, would you expect an oxide ion to be joined with one atom of calcium or one atom of potassium? Why?

Physics
A hammer of mass m falls from rest off of a roof and drops a height H onto your head. a) Assuming that the tool is in actual contact with your head for a time ?t before it stops and slides off, what is the algebraic expression for the average force it exerts on your skull ...

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