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Timothy S.

Intro Stats / AP Statistics

7 minutes ago

Let X and Y be continuous random variables having joint probability function: Find C

JB

Janet B.

Calculus 1 / AB

an hour ago

\lim_(y->1)(y^(2)-5y+4)/(y-1)

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Richard C.

Chemistry 101

an hour ago

If you isolate more than one crop of crystals, what must you do before combining them?

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Thomas M.

Physics 101 Mechanics

an hour ago

Activity 1 The fan speed on our cart is adjustable. In this activity the fan speed will be on medium to give the cart a continual push down the track to the right. We start by holding the cart still and then releasing it from rest. Prediction 1-1: Describe briefly what you think the position, velocity, and acceleration graphs will look like for the motion of the cart. Question 1-1: How does your position graph differ from the position graphs for steady motion (constant velocity) that we have seen in last week’s lab? Question 1-2: What feature of this velocity graph signifies that the motion was away from the sensor? Question 1-3: What feature of your velocity graph signifies that the cart was speeding up? How would a graph of motion with constant velocity differ? Question 1-4: During the time that the cart is speeding up (which is from about 0.4s to about 2.6s) is the acceleration positive or negative? How does speeding up while moving away from the detector result in this sign of acceleration? (Hint: Remember that acceleration is the rate of change of velocity. Look at how the velocity is changing. It takes two points on the velocity-time graph to calculate the rate of change of velocity.) Question 1-5: How does the velocity vary in time as the cart speeds up? Does it increase at a steady (constant) rate or in some other way? Question 1-6: How does the acceleration vary in time as the cart speeds up? Is this what you expect base on the velocity graph? Explain. Question 1-7: If you were to draw a velocity vector for three different times on the graph (1.0s, 1.5s, and 2.0s), what would they look like? Specify what direction you would make the arrows and how the length of the arrows would compare to one another. As usual, we say that the positive direction is to the right. Question 1-8: Using the arrows you drew for the question above, find the change in the velocity vector by performing a subtraction of two vectors. Calculate the change by taking the vector for 2s minus the vector for 1.0s. (Do this separately on a piece of paper using the head-to-tail method of vector subtraction.) Based on the direction of this vector, what is the sign of the acceleration? Does this agree with your answer to 1-4?

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Jesse H.

Chemistry 101

an hour ago

Hydrogen fluoride is produced industrially by the action of sulphuric acid on CaF2. Suppose 242 kg of CaF2 is treated with an excess of sulphuric acid and 85.6 kg of HF is produced. a)What is the percent yield of HF? b)How much CaF2 remains unreacted?

LM

Lauren M.

Algebra

an hour ago

A dairy farmer chooses between two types of food for his small herd of cow. Let x be the number of pounds of alfalfa hay and y be the number of pounds of ground ears of corn to be bought. How many pounds of each food should be purchased in order to meet the nutritional requirements at the least cost, if the objective function is x+1.6y? (See the graph of the feasible set on the right.) The number of pounds of alfalfa hay, x, is equal to?

MS

Monica S.

Physics 101 Mechanics

an hour ago

A cannon tilted upward at θ= 25, fires a cannonball with a speed of 93 m/s . At that instant, what is the component of the cannonball’s velocity parallel to the ground? Express your answer in meters per second.

JC

Jessica C.

Intro Stats / AP Statistics

an hour ago

If an asset declines in value from $5,000 to $3,400 over nine years, what is the mean annual growth rate in the asset’s value over these nine years? Enter your answer as a percentage. If needed, round your answer to two decimal digits

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Daniel T.

Algebra

an hour ago

A truck travels from point M northward for 30 minutes then eastward for 1 hour, then shifted N30°W. If the constant speed is 40 kph, how far directly from M in km will it be after 2 hours?

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Nicholas S.

Physics 101 Mechanics

an hour ago

A person with compromised pinch strength in his fingers can only exert a normal force of 6.0 N to either side of a pinch-held object, such as a book (the book is held vertically). What is the greatest mass book he can hold onto vertically before it slips out of his fingers? The coefficient of static friction of the surface between the fingers and the book cover is 0.80. Please includ a free body diagram in the explanation.

JR

Jennifer R.

Calculus 1 / AB

an hour ago

(1 point) The width wnwn, in feet, at various points xnxn along the fairway of a golf course changes as shown in the figure below. The values of wnwn and xnxn are given in the table below the figure. (Click on the figure for a larger version--note that you may have to resize the window you get to get a nice picture.) The values of xnxn and wnwn are n=n= 0 1 2 3 4 5 6 7 8 9 10 xn=xn= 0 120 240 360 480 600 720 840 960 1080 1200 wn=wn= 0 80 88 90 98 93 85 93 98 98 0 If one pound of fertilizer covers 250 square feet, find a reasonable estimate for the amount of fertilizer needed to fertilize the fairway. amount of fertilizer = pounds

TC

Tamara C.

Algebra

an hour ago

A box is to be constructed from a square sheet of plastic by removing a square of side 2 inches from each corner, then by turning up the sides. If the box must have a volume of 242 cubic inches, find the length of one of the sides of the open box. Thank you

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Gregory R.

Physics 101 Mechanics

an hour ago

Mercury is poured into a U-tube with two cylindrical arms of different radii. Both arms are cylindrical tubes. The left arm of the tube has a radius of 10cm, and the right arm has a radius of 5cm. 200g of water are then poured into the right arm. Given that the density of mercury is 13.6 g/cm3, to what height h above the mercury level in the right arm, does the mercury rise in the left arm? State your answer in centimeters to the nearest hundredth of cm. Use g = 9.8m/s2

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Patricia D.

Physics 101 Mechanics

an hour ago

As a science project, you drop a watermelon off the top of the Empire State Building, 320 m above the sidewalk. It so happens that Superman flies by at the instant you release the watermelon. Superman is headed straight down with a speed of 31.0 m/s . How fast is the watermelon going when it passes Superman? Express your answer with the appropriate units. Show work plz thank you

MS

Michael S.

Calculus 1 / AB

an hour ago

Find the moment of inertia and the radius of gyration of a plate covering the region bounded by y = 4x2, x=1 and y=0 with respect to the y – axis. Sketch the curves.

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Taylor W.

Chemistry 101

an hour ago

Industrial strength laundry bleach is an aqueous solution containing 1.34 M sodium hypochlorite by mass. What is the mass percent of sodium hypochlorite of this solution? The density of the solution is 1.082 g/mL.

AM

Ashley M.

Physics 101 Mechanics

an hour ago

You are driving through town at 11.0 m/sm/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.0 m/s2m/s2. How far do you travel before stopping? Express your answer using two significant figures.

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Alicia N.

Geometry

an hour ago

A conical heap of sand has its base diameter equal to twice its height, h. If the volume, V, of the sand is 3 m3, find the height of the heap.

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Donna N.

Biology

an hour ago

Fill in the blanks with the correct terms: Gymnosperms and angiosperms are both _______ plants since they both produce _________ for reproduction. Gymnosperms rely entirely on the ________ for reproduction. You can tell this because their pollen and seeds have _________ on them for gliding. Angiosperms have two specialized structures for reproduction. A ____ ______ contains the male and female reproductive structures while a __ _______ contains the seeds produced by the plant. All plants undergo an _____________________ during their lifecycles. A haploid generation gives rise to a diploid generation and vice versa. In gymnosperms and angiosperms, the diploid or _____________ generation is dominant.

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Laura P.

Intro Stats / AP Statistics

an hour ago

The table below lists the scores of nine students in Chemistry and Physics tests. Students(i) 1 2 3 4 5 6 7 8 9 Chemistry Scores (xi) 3 6 5 8 9 4 5 7 8 Physics Scores (yi) 6 5 7 6 2 3 4 6 4 a. Find the correlation coefficient of the variables x and y. b. Compute for b and m in the linear regression equation. c. Give the regression equation. d. Predict the Physics score of a student when he or she got a score of 10 in Chemistry

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Emily D.

Chemistry 101

an hour ago

Antimony is alloyed with lead to increase the rigidity of components used in the construction of lead storage batteries. 3.565 g of a particular metallic alloy, compounded of only Pb and Sb, can be quantitatively converted into a 4.136-g mixture of the oxides PbO2 and Sb2O4. What was the percentage (by mass) of antimony in the alloy?

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Gabriel S.

Algebra

an hour ago

The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May her driving cost was $380 for 480 mi and in June her cost was $440 for 720 mi. Assume that there is a linear relationship between the monthly cost C of driving a car and the distance x driven. (a) Find a linear function C that models the cost of driving x miles per month. C(x)= (b). What is the slope of this line? (c). At what rate does Lynn's cost increase for every additional mile she drives? $ __ per mi

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Nicholas R.

Physics 101 Mechanics

an hour ago

A car was at rest and reaches a velocity of 75 m/s after covering a distance of 250 meters. Calculate the acceleration of the car.

MS

Matthew S.

Biology

an hour ago

Questions about Diabetes and Insulin Signaling 1. What are the essential parts of a signaling pathway? 2. How could activating a transcription factor cause long-term cellular changes? 3. What roles can phosphorylation play in protein function? 4. What is the enzymatic activity of a kinase and of a phosphatase? 5. What determines where a protein kinase or protein phosphatase will perform its enzymatic activity?6. Why would a signaling pathway need to be regulated? 7. Hypothesize some situations where it would be necessary for signal transduction to happen very rapidly, as happens after the activation of either a kinase cascade or a second-messenger pathway 8. How could the study of insulin signaling help people with diabetes? 9. Why does it make sense that Mia’s grandfather may be more fatigued than a non-diabetic? 10. Examine the figure of insulin signaling. Why does one receptor have so many different signal transduction proteins/pathways? 11. How does a lack of insulin prevent the cell from using glucose? 12. Why is it important that specific tissues respond to insulin in different ways? 13. Hypothesize a mechanism to explain how tissues respond to insulin in different ways, even tissues that have the same amount of the receptor.

SM

Stacey M.

Chemistry 101

an hour ago

The drug; Clavulanic acid is used with the antibiotic penicillin to treat certain infections in the lung, ears and skin: H HO Name the circled functional groups:

1 2 3 4 5 ... 214678

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