Posts by jack
Total # Posts: 2,032

Physics
plane’s sound detector perceives the horn’s sound, the plane has traveled a distance equal to onehalf its altitude above the ocean. If it takes the sound 1.658 s to reach the plane, determine the altitude of the plane. The speed of sound is 343 m/s. Answer in units ... 
Physics
The distance between two successive crests of a certain transverse wave is 1.10 m. 10 crests pass a given point along the direction of travel every 11.1 s. Calculate the wave speed. Answer in units of m/s. 
science (physics)
if a car is driving on a flat road at a constant speed. the driver drives off a cliff which is 180 m above a river it lands in the river 90 m away (measured horizontally), how long does it take for it to land 
Physics
In Young's experiment a mixture of orange light (611 nm) and blue light (471 nm) shines on the double slit. The centers of the firstorder bright blue fringes lie at the outer edges of a screen that is located 0.452 m away from the slits. ... 
Physics
The pupil of an eagle’s eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 182 m, the eagle sees them as one unresolved object and dives toward them at a speed of 15 m/s. Assume that the eagle... 
Physics
A 2.60kg block is attached to a horizontal spring that has a spring constant of 214 N/m. At the instant when the displacement of the spring from its unstrained length is 0.115 m, what is the acceleration a of the object? In your answer, be sure to include the proper plus or ... 
science
where does the Housatonic river in Connecticut originate and what is its base level? 
Math
Eunice runs around an oval quartermile track, completing one lap every 2 minutes and 30 seconds. At this speed, how many seconds will it take him to run a mile? 
marketing
Competitors that offer similar content to Motor Trend on Demand 
English
I was wondering if anyone could give me an idea for this essay prompt? Describe a situation in which you have made a direct impact on the life of someone else. I just have no idea where to start or write about... 
Science
1) What unit is speed measured in? 2) Why is it important to include units when describing motion? I've read this entire lesson. I just can't seem to find these answers. 
Im very confused and need help Language Arts
isabelle everthing is correct except for number 2 it is not b it is a 
chem
How many moles of S are needed to combine with 0.208 mol Al to give Al2S3? break it down thanks 
Math
Do not listen to Rachel!! I got 9/19 
mathematics
camine has 3 pieces of wire . the lenght 1st wire 5 meters the lenght of second wire is 3 meters less than tice the lenght of third wire . what is the peremeter of the triangle if the wires are connected end to end and the scond 9 meters long 
math
Thanks Help is on the way with USA 100% 
Math
How is log(base(x))x^m1=1 My Answer Key says m1+1=0 but I don't understand that solution 
Feedback Control
The goal of this project is to model the longitudinal motion of a Segway and design a PID controller for it. The model must include the dynamics of the inverted pendulum on two wheels, as shown on Figure 1 (left), and the model of the DC motors (same as ) that actuate the ... 
Math
solve the equation t/4=20 
Math
it means that Elliot had double the amount of cards that Sam has. (Example Elliot had 12 cards and Sam had 24 cards) 
Math
Elliot has twice as many trading cards as Sam. Elliot has 20 trading cards. write and equation and use it to determine the number of trading cards Sam has. a. s+2 = 20;18** b. s/2 = 20;40 c. 2s = 20;10 d. s2=20;22 
Math
Find the unit rate for a sponge cake that weighs 25 ounces and has 2750 calories. A. 0.009 calories per ounce B. 110 calories per ounce** C. 68,750 calories per ounce D. 115 calories per ounce 
math
No that was not me. what is the link 
math
50 is what percent of 13? Thanks 
Math
Ok 
Math
I got 23 ft. 
Math
What would the height of the building be. 
Math
Thank You! 
Math
kory is standing near a building that has a shadow that is 14 feet long. Kris is 5.5 feet tall, and the length of her shadow is 3.5 feet. set up and solve a proportion to determine the height of the building. 
Algebra
Answer it 
math
Tamika’s dad bought a Mustang convertible for 12,000 dollars to celebrate his first job in 1978, which paid him 15,000 dollars a year. If Tamika is to use the same fraction of her salary as her dad to buy a Mustang convertible, which now sells for 32,000 dollars, what ... 
maths
thats wrong 
maths
Pedro earns 7.50 dollars an hour at his job at Matrix Cinemas. If he works 20 hours this week and his employer withholds a total of 22 percent of his weekly pay for taxes and Social Security, what is his takehome pay for the week? 
Math
Hwan decides to lose weight before the wrestling season begins. He weighs 148 pounds now and loses one pound per week for six weeks. Let y represent Hwan’s weight and let x represent the time in weeks. What is the slope of the line? The y intercept is 148 
Math
Wait so the slope is x and y intercept is 148? 
Math
Hwan decides to lose weight before the wrestling season begins. He weighs 148 pounds now and loses one pound per week for six weeks. Let y represent Hwan’s weight and let x represent the time in weeks. What is the slope of the line? What is the y intercept 
stast
suppose the alternative hypothesis in a hypothesis test is "the population mean is less than 60" if the sample size is 50 and alpha =.05, the critical value of the z is? 
Math
What is the next term in the sequence 81, 27, 3, 1, 1/3... 
Math
Detemine the sequence as arithmetic, geometric, both or neither. 16,8,4,2,... 
Science
Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens. A. Integumentary system B. Nervous system C. circulatory system D. endocrine system I think it is C 
social studies
Thanks 100% :) 
Math
Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24 
Math
Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100 
Math
Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25 
Math
Which Ratios for a proportion? A. 4/9,12/25 B. 3/7,18/42 C. 5/11,20/45 D. 5/8,15/25 Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100 Which proportion has cross products of 5*24 and 8*15? A. 5/8 = 15/24 B. 5/24 = 8/15 C. 8/24 = 15/5 D. 15/8 = 5/24... 
Math
Convert the map scale to unit rate. How many inches represent one mile? Show Your work. Interpret the meaning of unit rate. 3/10 in. = 7/8 miles 
Math
Thanks 
Math
286 miles in 5 1/2 hours 
Math
Write the ratio as a unit rate 
Math
Ok thanks 
Math
Write the ratio as a unit rate. 8 meters in 10 seconds. A. 0.8 meter per second B. 1.125 meters per second** C. 2 meters per second D. 80 meters per second 
History
Thanks! 
History
What was the 54 mile civil rights march called that was after bloody Sunday? 
Math
an object is moving along the xaxis such that the position of the object in masters at time t in seconds is giving by the function x(t)=t^312t^2+36t5, for 0<=t<=8 a when is the object moving right? and when to the left? b When is the object's velocity both ... 
Math
Thanks 
Math
The cost in dollars of a class party is 59+13n, where n is the number of people attending. What is the cost for 44 people. 
Math
Thank You 
Math
d+g/h for d =35, g = 19, and h=6 
Math
How do i do this with and without distribution? 
Math
Thanks 
Math
you want to buy three books that are on sale at 20% off. the original prices of the books are $2.50, $4.95, and $6.00. How much will you save? Calculation With distribution. Calculation without distribution. 
History
Thank You 
History
Why was northern Italy a natural birthplace for the Renaissance? 
algebra
George is starting a new streaming music service. For a monthly fee, you can stream 50 songs. There is an additional charge for each song over 50. In August, Bill was charged $11.22 for 67 songs and in September he was charged $13.50. Write a function for the total charge. ... 
Math
These two are correct i just finished the quiz. 
Math
a) y=4 b) m=5 Would this be correct 
Math
Solve using metal math. a) 4y+3=19 b) 2+3m=17 
Math
One of the sides is 5.8 but would the other side go in the place of z. that is what i thought. 
Math
There are not given 2 sides to divide. What do you mean. 
Math
Solve the equation 5.8 = z/2.2 
Math
Thank you so much 
Math
Solve the equation 2.8x = 9.24 
Math
I solved this. It is 18 
Math
What Value of x is a solution to the equation? x2 = 16 
Math
Write an algebraic expression for the sum of 3 Coins and c Coins 
Math
Evaluate 5g6 for g = 2 
MATH PLEASE HELP
Thank You 
MATH PLEASE HELP
1) 5g6 for g = 2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x2 = 16 4) use mental math to solve the equation. z/12 = 5 5) estimate the solution of the equation x8.1 = 5.3 to the nearest whole ... 
Math
I know how to do these now thanks 
Math
or how to do them 
Math
I really just don't understand algebraic equations like these 
Math
1) 5g6 for g = 2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x2 = 16 4) use mental math to solve the equation. z/12 = 5 5) estimate the solution of the equation x8.1 = 5.3 to the nearest whole ... 
Math
5g  6 for g=2 
religion
they help and pray for the people in need 
math / science
a bacteria population doubles every eight minutes. if the population begins with one cell how long will it take to grow to 512 cells? 
pre calculus
ohhhhh, i see! thank you for making it simple to understand 
pre calculus
Double Angle Formula. If the double angle formula for cos2(u) = 2cos^2(u)1, then write the double angle formula for cos2(u) in terms of sine. 
art
keeping facial features in proportion means 
Math
The track at Coolidge Middle School is 14 of a mile long. It takes Melissa 1 minute and 40 seconds to run around the track. How many minutes will it take Melissa to run 3 miles? 
Science Please helpppp me!!
The answer is D) Multicellular. Hope this helps. 
physic
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50 m in a straight line, reaching a final speed of 79 km/h. Determine the cheetah's average acceleration during the short sprint. m/s2 
CHEMISTRY
2HBr+Mg(OH)2 > MgBr2+2H2O how many mL of a 0.2 M HBr solution is required to react with 40 mL of a 0.40 M Mg(OH)2 solution 
math
simplify 8/2 + 9 (12 divided by 3x2)7 explain each of your steps i thought it was 1 
math sequence
5th term for recursive sequence: a(1) = 1 a(n+1)=3a(n)1 
grammar
Is this correct? It is the waves, where... The "it is the waves" part. thanks 
algebra
3x^4 + 5x^2  2 = 0 give imaginary and real roots rational roots theorem factors of (+)p/q are possible rational zeros of function f where the coefficients of f are integers. how do you go about solving this? 
Algebra
4x^2  13x + 3 How do you break this into groups? So far I'm having trouble with this type of concept. Please explain it, thanks! 
Grammar
I apologize for asking too many of these questions, but I need to know for sure if I'm doing this right. "Thus the creation of infinite universes from this world of nothing was prevented." I'm confused if it is was or were again. When I say it to myself, I ... 
Quotations
When starting a new sentence, do you add a capitalization at the beginning of the next dialogue format? Like this. He seemed to like it. "Mmm! This tastes good!" said Bardo. or "Mmm! This tastes good!" Said Bardo. 
grammar
" This had never happened before. Usually he would be the one who wakes up the earliest. " Is there anything wrong in this sentence?