# Don

Most popular questions and responses by Don-
## Physic

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on

*asked on September 28, 2011* -
## Math

Start at 5. Create a pattern that adds 3 to each number. Stop when you have 5 numbers.

*asked on September 22, 2016* -
## Technology

To insert clip art into a document, what step should I take immediately after i find the clip art I want to insert? a. Use scroll bars to view more choices of clipart. b. Click on the clip art image. c. Click on the clip art button. d. Click insert tab at

*asked on September 12, 2016* -
## physics

A spaceship is observed traveling in the positive x direction with a speed of 150m/s when it begins accelerating at a constant rate. The spaceship is observed 25s later traveling with an instantaneous velocity of 1500m/s at an angle of 55 degrees above the

*asked on July 27, 2008* -
## Discete Math

Show that there must be at least 90 ways to choose six integers from 1 to 15 so that all choices have the same sum.

*asked on February 27, 2012* -
## easy math

What value of c makes x^2 + 6x + c a perfect square trinomial? 3 6 9 12

*asked on October 28, 2016* -
## English **One Question**

In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to

*asked on February 3, 2015* -
## Physics

Two banked curves have the same radius. Curve A is banked at an angle of 11°, and curve B is banked at an angle of 16°. A car can travel around curve A without relying on friction at a speed of 18.5 m/s. At what speed can this car travel around curve B

*asked on November 7, 2012* -
## math

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?

*asked on August 28, 2014* -
## Chemistry

Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) =

*asked on February 1, 2011* -
## math

If a tree is 10 feet tall after two years and 25 feet tall after 5 years, find the rate of change of growth of the tree if y is the height in feet and x is the number of years. Be sure to give correct units.

*asked on February 12, 2012* -
## probability

the probability of winning a carnival game is 15%. Elaine plays 10 times. find the probability that Elaine will win 2 times.

*asked on February 21, 2017* -
## Physics

During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 148 N on the wire. The left section of the wire makes an angle of 12°

*asked on October 30, 2012* -
## Physics

The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles are mA = 363 kg, mB = 517 kg, and mC = 154 kg. Find the magnitude and direction of the net gravitational force acting on each of

*asked on October 30, 2012* -
## Math

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a

*asked on September 21, 2014* -
## chem 4

How many grams of sodium chloride are needed to make 1 L of 0.9% (m/v) sodium chloride solution (“isotonic saline”).

*asked on November 22, 2012* -
## Physics

A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (è = 60.0°) Suppose the total mass of a chair and its occupant is 222 kg

*asked on November 7, 2012* -
## Physics

A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0120 s. The average force exerted on him by the ground is +17000. N, where the upward direction is taken to be the

*asked on November 12, 2012* -
## chemistry

Carbon monoxide gas and hydrogen gas are mixed in a two liter flask. The reaction produces methanol gas as the only product. At equilibrium the Keq is 1.1 x 10-5. The flask initially held 6 grams of hydrogen and the equilibrium concentration of hydrogen is

*asked on March 12, 2012* -
## Physics

your friend says that the equivalent (combined) resistance of resistors connected in series is always more than the resistance of the largest resistor. Dou you agree?

*asked on April 11, 2010* -
## Physics

The drawings show three charges that have the same magnitude but different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|= 5.5 µC, and the distance between them is d = 4.3 mm. Determine the

*asked on February 3, 2013* -
## CHEMISTRY

A(aq) + B(aq) + C(aq) → D(aq) [A]. [B]. Rate (mol) 0.01 0.02 0.0005 0.02 0.02 0.0010 0.01 0.04 0.0020 Determine : a) The order of the reaction of each reactant b) The rate law c) The rate constant K, Using result from experiment 1. Please working answers

*asked on March 31, 2018* -
## physics

Each of the space shuttle's main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 595 rev/s. A point on one of the blades traces out a circle with a radius of 0.02 m as the blade rotates. (a) What is the

*asked on November 7, 2012* -
## CHEMISTRY

An equilibrium mixture of the following reaction was found to have = 0.0325 at 1200 degrees C. What is the concentration of I? I2(g)2I (g) Keq=1.3×10−2 at 1200

*asked on November 28, 2012* -
## Trig

Rewrite tan 88 deg in terms of its cofunction How does that end up????

*asked on December 22, 2011* -
## Market Research

Let N 6 and n 3. For purpose of studying sampling distributions, assume that all population values are known. Specically, y1 98, y2 102, y3 154, y4 133, y5 190, and y6 175. We are interested in yU, the population mean. Two sampling plan

*asked on November 3, 2014* -
## English LAST 1. (:

It's about MLk I Have A Dream speech. Why does King use the rhetorical technique of parallel structure in his speech? A)to show that he is aware of the time that has passed B)to show that others are not aware of the time that has passed C)to show that two

*asked on February 3, 2015* -
## Algebra

Use the discriminant to determine how many real number solutions the equation has. t^2 + 8t + 16 = 0

*asked on May 23, 2010* -
## math

If you place $2,000.00 in a saving account with an interest rate of 4.5% month versus an account with a rate of 3.75% month, how much more interest could you earn in that month using the first account?

*asked on March 14, 2016* -
## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

*asked on October 26, 2010* -
## stats please help ASAP!!!

A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean

*asked on May 17, 2013* -
## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

*asked on October 26, 2010* -
## Phy I

Two forces, 1 and 2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 47.5 N and F2 = 34.5 N. What is the horizontal acceleration (magnitude and direction) of the block?

*asked on October 3, 2012* -
## math

the folowing equation 9+8x7-6x5+4x3+2=105 How do u get this?

*asked on October 19, 2011* -
## Math (Help Please)

1. Which of the following shows how this expression can be simplified? 2x + 6 + 3x − 4 A. x − 2 B. x + 2 C. 5x + 2 D. 5x − 2 2. Which is equivalent to the expression below? 7(2p − 1) A. 7p B. 14p − 1 C. 14p − 7 D. 14p − 8 3. Factor the

*asked on March 6, 2016* -
## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

*asked on March 23, 2018* -
## English

What is a metaphor for a deep voice?

*asked on May 22, 2014* -
## Physics

The coil of wire in a galvanometer has a resistance of RC = 78.0 Ù. The galvanometer exhibits a full-scale deflection when the current through it is 0.440 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The

*asked on February 24, 2013* -
## Physics 30

a 2000kg car traveling east at 24m/sec enters an icy (frictionless) intersection and collides with a 3600kg truck traveling south at 10 m/sec. If they become coupled together in the collision, what is their velocity immediately after impact?

*asked on May 1, 2012* -
## algebra

74=6-h=qx=5=6.09009(0)=_______

*asked on December 7, 2018* -
## Physics

Two tiny conducting spheres are identical and carry charges of -19.8 µC and +54.5 µC. They are separated by a distance of 2.45 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive? 1 N 2

*asked on January 29, 2013* -
## math

how many times greater is the first 7 than second in 876574?

*asked on June 9, 2012* -
## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

*asked on March 22, 2018* -
## calculus

I need help with this problem: The path traveled by a golf ball with a 9-iron can be modeled with the quadratic equation, y= -0.042xsquared + 5x, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet.

*asked on February 19, 2013* -
## Trig

If sin = 2/3 and is a second quadrant angle, determine the exact value of sec^2 could be a. 5/9 b. root5/3 c. 9/4 d. 9/5 Please help.......

*asked on December 20, 2011* -
## chem 1

if 58.44 g of sodium chloride is dissolved in 0.5 liter of water what is the molarity of the sodium chloride solution? The molar mass of sodium chloride is 58.44 grams per mole.

*asked on November 22, 2012* -
## financial management

Your investment adviser has sent you three analyst reports for a young, growing company named Vegas Chips, Incorporated. These reports depict the company as speculative, but each one poses different projections of the company’s future growth rate in

*asked on March 25, 2011* -
## Algebra

Joe's electric made 18 customer calls last week and 25 calls this week. How many calls must be made next week in order to maintain an average of at least 21 calls for the three week period at least __ calls must be made to maintain an average of 21. Is the

*asked on October 2, 2009* -
## Physics

An electric drill operates at a potential difference of 120V and draws a current of 1.5 Amps. If it takes 50 seconds to drill a hole in a piece of steel,calculate the amount of electrical energy used by the drill in that time.

*asked on May 18, 2012* -
## Algebra

A roof truss is in the shape of a triangle with height of x feet and a base of 2x + 1 feet. Write a polynomial A (x) that represents the area of the triangle. Find A (5).

*asked on July 14, 2008* -
## Trig

If the center of a circle is at (2,2) with a radius of 4 the equation of the graph would be : a) (x-2)^2 + (y-2)^2 = 16 b) (x+2)^2 + (y+2)^2 = 16 I think it would be b is that correct?

*asked on January 4, 2012* -
## Physics

Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?

*asked on November 7, 2012* -
## physics

A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 4.20 104 s. What is the speed at which the satellite travels?

*asked on November 7, 2012* -
## Finance

Ron starts with a $100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

*asked on December 1, 2016* -
## Math

The local dinner offers a meal combination consisting of an appetizer, two soups, four main courses, and five desserts. Your diet retricts you to choosing between a dessert and an appetizer. (You cannot have both). Given this restriction, how many

*asked on May 6, 2013* -
## calc

by applying rolle's theorem, check whether it is possible that the function f(x) = x^5 + x -17 has two real roots. your reason is that if f(x) has two real roots then by rolle's theorem, f'(x) must be equal to what at certain value of x between these two

*asked on March 16, 2012* -
## Algebra

A certain kind of animal weighs about 71 pounds at birth and gains about 2 pounds per day for the first few weeks. Determine those days for which the animal's weighs more than 117 pounds. The animal's weight is more than 117 pounds when the animal is more

*asked on October 2, 2009* -
## MATHS STATISTICS

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by

*asked on May 13, 2013* -
## Physics

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration

*asked on November 6, 2012* -
## Physics

An electric immersion heater is rated 5 A when connected to a 120V circuit. What is the resistance of the heater? If it takes 168 KJ to heat 500 ml of water from 20 deg C to boiling, how long does it take to heat the water?

*asked on May 18, 2012* -
## algebra

if the red river is 500 miles longer than the blue river. if the sum of their lengths is 5550 miles what is the length of each river

*asked on April 16, 2012* -
## chemistry

in a compound of nitrogen and oxygen, 14.0 grams of nitrogen combines with 32.0 grams of oxygen. How much oxygen is required to combine with a sample of 10.5 grams of nitrogen in producing same compound? How do you do the math?

*asked on June 6, 2011* -
## Finance

Ron starts with a $100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

*asked on December 1, 2016* -
## Physics

A 0.069-kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.95 m. With what speed does the arrow leave the bow?

*asked on November 12, 2012* -
## Physics

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration

*asked on November 6, 2012* -
## Programming

2. Then it should prompt the user for the input file name of the file containing the data to sort. 3. If the program can't open the file or if no file name is entered (^d or ^z is entered for EOF), it should print an error message and exit. 4. The file

*asked on June 29, 2011* -
## Chem

a container of 2.00 moles of an ideal gas as 1000 K undergoes a constant pressure and volume process in which the number of moles is increased to 5moles. what is the final temperature of the gas. How do I start this? Do I somehow use the ideal gas law?

*asked on November 30, 2010* -
## math

how to write 9.035 in expanded notation

*asked on June 17, 2012* -
## Business

If one company(A) owns another company(B) and Company B owns a third company (C) is it safe to say that Company A owns part of Company C? A real life example is the sports media group TSN is 20% owned by ESPN. ESPN is then in turn 80% owned by The Walt

*asked on March 14, 2011* -
## Geometry

8)Suppose that a given parallelogram is not a rhombus or a rectangle. Which of the following can you conclude about this parallelogram? A) Its diagonals are perpendicular bisectors of each other. B) It is a square. C) Its angles are not all congruent. D)

*asked on May 23, 2010* -
## Physics

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the

*asked on April 8, 2013* -
## Physics

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field

*asked on April 4, 2013* -
## Physics

A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?

*asked on November 12, 2012* -
## Physics

A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 31 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 145 m), the block swings toward

*asked on November 7, 2012* -
## math

there are 3 shirts,2 caps,4 pairs of shorts.how many different outfits can wear ?(consisiting of one shirt,one pair of shorts and one cap

*asked on June 9, 2012* -
## math

I need help with write the equation of the line which contains the point (0,negavtive 3), or written ars(0, -3) and whose slope is 4. if you want the equation in the form y = mx + b sub in -3 for y, 4 for m, and 0 for x for -3 = 4(0) + b so b = -3

*asked on April 27, 2007* -
## physics

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?

*asked on March 9, 2015* -
## Physics

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field

*asked on April 4, 2013* -
## Physics

A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle è = 20°. For a speed of 40 m/s, at what value of the distance d should a driver

*asked on November 7, 2012* -
## math

121 balls are placed in group of 7and 5 in basket.how many baskets 0f 7 were there?

*asked on July 29, 2012* -
## Physics

If I know the length of all 3 sides in a right angle triangle, how do I get the degrees of the other angles? Which formula do I use again?

*asked on May 6, 2012* -
## algebra

Can someone help me figure this out please? when you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? thank you anyone

*asked on March 18, 2012* -
## Trig

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

*asked on December 17, 2011* -
## Chem

Consider a glass of 277 mL of water at 25°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL. I have no idea how to

*asked on February 1, 2011* -
## CMIS

What is the current practical limit on the number of GEO satellites?

*asked on March 11, 2010* -
## physics

A box is pushed a distance of 2 m with a force of 20 N. How much work is done on the box?

*asked on June 24, 2018* -
## Math homework help

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)

*asked on May 17, 2014* -
## DISCRETE MATHS

Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).

*asked on October 25, 2013* -
## linear algebra

solve using gauss jordan 10y − 4z + w = 1 x + 4y − z + w = 2 3x + 2y + z + 2w = 5 −2x − 8y + 2z − 2w = −4 x − 6y + 3z = 1

*asked on May 13, 2013* -
## Physics

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?

*asked on March 25, 2013* -
## calculus

I need help with the following problem: From a point 50 meters from the bottom of a radio tower along level ground, the angle of elevation to the top of the tower is 67 degrees. What is the height of the tower?

*asked on September 3, 2012* -
## math

I need help answering the following question: A road sign reads: "5% grade next 4 miles." What is the change in elevation from the lookout to the point four miles ahead (to the nearest foot)?

*asked on August 26, 2012* -
## rounding numbers

I need to to round 423,607,492 to the ten thousands. I then need to round it to the million. Can someone help me. I will be happy to check your work. Which numeral is in the ten-thousand place in this number? Which numeral is in the million place? Once you

*asked on April 18, 2007* -
## Physics

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?

*asked on March 25, 2013* -
## Maths

How many ordered triples of positive integers (a,b,c) with 1

*asked on March 1, 2013* -
## Trig

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

*asked on December 17, 2011* -
## Trig

Solve 2cosxsinx + sinx = 0 using unit circle.

*asked on November 2, 2011* -
## Algebra 1A

From a base elevation of 8200 ft. a mountain peak in colorado rises to a summit elevation of 14588 ft. over a horizonal distance of 15842 ft. find the grade of the peak. The grade of the peak. The grade of the peak is %. Round to the nearest tenth as

*asked on October 8, 2009* -
## present value

The present value P that will amount to A dollars in n years with interest compounded annually at annual interest rate r, is given by P = A (1 + r) -^n. Find the present value that will amount to $50,000 in 20 years at 8% compounded annually.

*asked on July 14, 2008* -
## Physics

The electric potential energy stored in the capacitor of a defibrillator is 77 J, and the capacitance is 123 µF. What is the potential difference that exists across the capacitor plates?

*asked on February 18, 2013*