Total # Posts: 403
Salmon often jump waterfalls to reach their breeding grounds. Starting 3.16 m from a waterfall 0.257 m in height, at what minimum speed must a salmon jumping at an angle of 37.9◦ leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s2 . Answer ...
October 16, 2012
jim owns a square piece of land with a side length of a meters. he extends his property by purchasing adjacent land so that the length is increased by 10 m and the width by 12 m. write an algebraic expression for the area of jim's extended property
May 23, 2012
Hetfield and Ulrich, Inc., has an odd dividend policy. The company has just paid a dividend of $7 per share and has announced that it will increase the dividend by $5 per share for each of the next 4 years, and then never pay another dividend. If you require a 14 percent ...
April 29, 2012
Which of the following would be the best revision of these sentences? "Our present receivables are in line with last year's. However, they exceed the budget. The reason they exceed the budget is that our goal for receivable investment was very conservative." A. &...
April 14, 2012
The ratio of Maya's beads to Kayla's beads was12:7. After Maya bought another 28 beads and Kayla gave away 32 beads, 5/7 of Kayla's beads were left. How many more beads did Maya have than Kayla in the beginning? Find the ratio of Maya's beads to Kayla's ...
April 8, 2012
If Will gives Molly $9 he will have the same amount as her. If Molly gives will $9 the ratio of the money she has to the money Will has will be 1:2. How much money does Will have in the beginning
April 7, 2012
1. Identify areas of environmental concerns. According to the area that the Bivouac site will be set, it will be an area where there will be hills, wetlands (water source), several winding streams, and one large river and some marked-off archeological sites. This are the ...
March 8, 2012
there were 490 altogether in 2 groups. group A consited of only boys and group b constied of only girls. ther were 2 and a half times as many girls as boys. some girls joined group b and foe every 4 boys in group a 32 more boys jioned the group. the total number og girls was ...
March 1, 2012
Tap A was turned on to fill a rectangular tank of 50 cm by 40 cm by 28 cm with water at a rate of 6 liters per minute. After 2 minutes, Tap B was turned on to drain water from the tank at a rate of 2 liters per minute. 6 minutes after Tap B was turned on, both taps were turned...
February 28, 2012
Sally is driving her car and talking on her cell phone. Statistically this behavior has been shown to be quite dangerous and contributes to many automobile accidents. In performing these two tasks simultaneously, Sally uses: a. conscious cognitive processes b. mindless ...
February 20, 2012
The majority of psychologists are electric, which means they draw information from different schools of thought rather than limiting themselves to information gained from only one perspective. However, most psychologists agree that it's important to: a. gather empirical ...
February 20, 2012
If Julie bought 8 T-shirts, she would be short $28. If she bought 4 T-shirts and 3 baseball hats, she would have $17 left. If each hat cost $5, how much money did she have in the beginning?
January 22, 2012
every week Brady gets $2.50 more for his allowance than Max does. They spend $6 on snacks and save the rest. Brady saves $72, but Max saves only $52. How many weeks does it take Brady to save $72? Hoe much money does Max get every week?
January 22, 2012
Object A attracts object B with a gravitational force of 10 newtons from a given distance. If the distance between the two objects is doubled, what is the changed force of attraction between them?
January 19, 2012
Imagine that a person is seated in a chair that is suspended by a rope that goes over a pulley. The person holds the other end of the rope in his or her hands. Assume that the combined mass of the person and chair is M. What is the magnitude of the downward force the person ...
January 16, 2012
A 32 kg child puts a 15 kg box into a 12 kg wagon. The child then pulls horizontally on the wagon with a force of 65 N. if the box does not move relative to the wagon, what is the static friction force on the box?
January 16, 2012
Eh, from what it looks like, it should just be the change in height that you need to do, which will be in units of miles right? and then you multiply that by the ratio of delta V to altitude change, which I believe is in units of (ft/s)/(change in miles)
December 28, 2011
A diver springs upward with an initial speed of 2.23 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.0 m (measured from the board), assuming that the downward direction is chosen...
December 13, 2011
In preparation for this problem, review Conceptual Example 7. From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 6.46 m/s. (a) What is the acceleration (magnitude and ...
December 13, 2011
A basic fact of algebra states that c is a root of a polynomial f(x) if and only if f(x) = (x-c)g(x) for some polynomial g(x). We say that c is a multiple root if f(x) = [(x-c)^2](h(x)) where h(x) is a polynomial. Show that c is a multiple root of f(x) if and only if c is a ...
September 27, 2011
Five years ago, you bought a house for $171,000. You had a down payment of $35,000, which meant you took out a loan for $136,000. Your interest rate was $5.6% fixed. You would like to pay more on your loan. You check your bank statement and find the following information. ...
August 9, 2011
5.00x 10^-2 mass with charge +0.75 micro coulombs is hung by a thin insulated thread. Charge of -0.9 micro coulombs is held .15meters directly to the right so that the thread makes an angle with the vertical. What is the angle and the tension in the string?
March 29, 2011
The population of SAT scores forms a normal distribution with a mean of µ =500 and a standard deviation of Ï =100. If the average SAT score calculated for a sample of n = 25 students, a. What is the probability that the sample mean will be greater than M= 510...
February 27, 2011
"A 280ml flask contains pure helium at a pressure of 754 torr . A second flask with a volume of 475ml contains pure argon at a pressure of 732 torr . If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium? ...
February 26, 2011
Samples of Neon and helium are placed in separate containers connected by a pinched rubber tube. There is 5.00 liters of neon at a pressure of 634 mm Hg in the first container. The second container has 3.00 liters of helium at 522 mm Hg. When the clamp is removed from the ...
February 18, 2011
All of the lanthanide metals react with HCl to form compounds having the formula MCl2,MCl3,or MCl4 (where M represents the metallic element). Each metal forms a single compound. A chemist has .250g sample of a transition metal, and wishes to identify the metal. She reacts the ...
February 9, 2011
suppose a house that costs $270,000 appreciates by 5% each year. in about how many years will the house be worth $350,000? use the equation 350 = (270) (1.05)^x and round the value of x to the nearest year.
February 7, 2011
Imagine you are conducting fieldwork and discover two groups of mice living on opposite sides of a river. Assuming that you will not disturb the mice, design a study to determine whether these two groups belong to the same species
January 24, 2011
Terence wants to estimate the height of a tree. He places a mirror on level ground, as shown in the picture below, and stands so that he can see the top of the tree in the mirror. Since light bounces off the mirror at the same angle at which it strikes the mirror, angle 1 ...
December 2, 2010