# Kevin

Newest questions and responses by Kevin-
## Newtonian Mechanics

A 10.5 kg weather rocket generates a thrust of 240 N . The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 480 N/m , is anchored to the ground. a)Initially, before the engine is

*asked on February 20, 2019* -
## Social Studies

Which of the following has contributed to the high rate of AIDS deaths in Africa? A. inadequate health care B. lack of clean water*** C. desertification D. poor infrastructure

*asked on February 20, 2019* -
## chemistry

2. Ammonia is produced by the reaction of hydrogen and nitrogen. N2(g) + 3H2(g) à 2NH3(g) o a. How many moles of H2 are needed to react with 1.0 mol of N2? o b. How many moles of N2 reacted if 0.60 mol of NH3 is produced? o c. How many moles of NH3 are

*asked on December 5, 2018* -
## english

I need help with rewriting a theme essay. The structure for the theme essay is intro paragraph (thesis statement with topic) and three examples (body paragraphs) and a conclusion paragraph.

*asked on October 18, 2018* -
## Math

b(b^2+1)+2(b^2+1)

*asked on October 9, 2018* -
## algebra

(7z^ m )(nz ^ 3 )=−14z^7

*asked on October 2, 2018* -
## Science

A certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object?

*asked on September 20, 2018* -
## Social studies help PLEASE

Which of the following factors helped trade to thrive during the Roman empire? Select all that apply. A. peace throughout the empire B. a shared religion throughout the empire

*asked on September 14, 2018* -
## English

There's more then one answer What types of rhetorical devices are used in the following sentence? They would like more time off in the summer, for holidays, and on weekends. repetition anadiplosis parallelism repetition epistrophe repetition anaphora

*asked on July 24, 2018* -
## english

Which sentence contains an adjective used as a modifier? A. There are two male puppies in the litter. B. Brian crunched on pretzels. C.The cats howled at 3:00 in the morning. D. Will you be at the park tomorrow?

*asked on July 16, 2018* -
## Chemistry

A 1.00 L flask is filled with 1.05 g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pressure is 1.150 atm . a.)What is the partial pressure of argon, PAr, in the flask? b.)What is the partial pressure of ethane,

*asked on July 11, 2018* -
## Quadratics

The parabola with the general equation y= ax^2 + bx+ 9 where0 < a < 10 and 0 < b < 20 touches the x-axis at one point only. The graph passes through the point (1, 25). Find the values of a and b. Please help.

*asked on June 29, 2018* -
## Quadratics

A platform diver follows a path determined by the equation h = −0.5d^2 + 2d + 6, where h represents the height of the diver above the water and d represents the distance from the diving board. Both pronumerals are measured in metres. Use the graph to

*asked on June 29, 2018* -
## math

in the sequence 0.07,0.12,0.17,... what term has a value of 1.67?

*asked on June 24, 2018* -
## math

in the sequence 2,6,10,... what term has a value of 106?

*asked on June 24, 2018* -
## Physics

A hunter wishes to cross a river that is 1.6 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at the maximum speed of 11 km/h with respect to the water . What is the minimum time necessary for

*asked on June 10, 2018* -
## Sociology

Describe the demographic characteristics of the poor in the United States. What are some possible explanations for this distribution?

*asked on May 31, 2018* -
## Chemistry

For the reaction HCONH2(g) -->

*asked on May 30, 2018* -
## science

A hawk building its nest on an arm of a saguaro cactus is an example of

*asked on May 10, 2018* -
## Science (Chem)

Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

*asked on May 5, 2018* -
## Chemistry

Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

*asked on May 5, 2018* -
## Chemistry

A potassium metal has a work function F = 4.41 x 10-19 J. Calculate the velocity of electrons emitted by exposing the metal to radiation of wavelength 300 nm.

*asked on May 1, 2018* -
## Chemistry

A 1.50 kg sample of a metal sample absorbs 43.5 kJ of heat, resulting in a Temperature rise of 65.0 °C. What is the specific heat capacity of the metal? M=1.50kG Q=43.5kJ dT=65C

*asked on April 20, 2018* -
## Chemistry: Equilbrium

How does adding NH3 to the reaction below affect the equilibrium of the reaction? N2(g) + 3H2(g) 2NH3(g) Increasing the amount of NH3 will make Q larger than K. A net reaction occurs in the direction to increase NH3, or the forward reaction. Increasing the

*asked on April 18, 2018* -
## Chemistry: Equilibrium

What is the significance of a very large Kp value on the equilibrium concentration of H2 in the reaction: 2H2(g) + O2(g) ->2H2O(g)?

*asked on April 18, 2018* -
## Chemistry

In a titration experiment, 15.0 mL of 0.10 M Ba(OH)2 is required to titrate a 10.0 mL of an unknown solution of HNO3. Calculate the concentration of the HNO3 solution using the data. 2HNO3 + Ba(OH)2 ® Ba(NO3)2 + 2H2O

*asked on April 18, 2018* -
## Chemistry

For the following redox reaction, identify the oxidizing agent and the reducing agent. Cu(NO3)2 (aq) + Mg(s) ® Cu(s) + Mg(NO3)2 (aq

*asked on April 18, 2018* -
## Science (Chem)

Calculate the volume (in mL) of a 0.150 M KCl(aq) solution that contains 10.00 g KCl

*asked on April 18, 2018* -
## Science

a black car and a white car are sitting in the Sun, why does the black car get hotter

*asked on April 15, 2018* -
## Chemistry

Given the following data for a hypothetical reaction: M3+ (aq)+ L-(aq) ⇋ [ML]2+(aq); calculate the equilibrium concentration of [ML]2+in the trial solution and Kc based on this single trial run of the equilibrium reaction. Standard solution data:

*asked on April 9, 2018* -
## Algebra

What are the domain and range of the function? f(x)=^3√(x−3) Domain: (−∞,∞) Range: (−∞,∞) Domain: [3,∞) Range: [0,∞) Domain: [0,∞) Range: [3,∞) Domain: [3,∞) Range: (−∞,∞)

*asked on April 9, 2018* -
## Physics

A tennis player hits a tennis ball (m = 0.0550 kg) with a force of 32.2 N over a time interval of 0.22 s. If the ball as a velocity of 42.2 m/s before being hit and 87.8 m/s after being hit, how much work did the tennis player do?

*asked on March 28, 2018* -
## Math

A recipe that makes 10 mini loaves of banana bread calls for 1 1/4 cups flour. How much flour is needed to make 2 dozen

*asked on January 17, 2018* -
## Chemistry

What is the mass number for a neutral atom that has an atomic number of 33 and 35 neutrons? How do you get the answer

*asked on December 10, 2017* -
## Geometry

1. If line JK is perpendicular to line XY at its midpoint M, which statement is true? a) JX = KY b) JX = KX c) JM = KM d) JX = JY Is it c? 2. What information is needed to conclude that line EF is the bisector of ∠DEG? a) m∠DEF = m∠DEG b) m∠FEG =

*asked on December 2, 2017* -
## Math

What's 9 + 10?

*asked on November 7, 2017* -
## Chemistry

How do you calculate the heat gained by the calorimeter after adding aluminium?

*asked on October 24, 2017* -
## Physics

A ball is dropped from a height h without air resistance. If the ball falls a distance of h/2 in a time t, how much time is required to fall the remaining h/2? Could you show steps because I don't understand how to work the problem. Thank you.

*asked on October 21, 2017* -
## Algebra

Alex is two-fifths as old as Clara. The sum of their ages is 56. How old is Alex?

*asked on October 18, 2017* -
## physics

If object B is dropped from a height of 100 m while moving horizontally at 115 m/s. How much time will it take for object B to hit the ground? (round answer to the tenth's place and use "s" to describe your answer)

*asked on October 17, 2017* -
## PreCalculus

Prove the following to be an identity (cotx + cscx)*(1-cosx)=sin x

*asked on October 15, 2017* -
## chemistry

Hydroselenic acid in formula form is H2SeO4?

*asked on October 12, 2017* -
## precalculus

sin^2 x + cos^2 x = 1 using that, derive what the cot^2 x would equal to. would it be csc^2 x - 1 = cot^2 x

*asked on October 11, 2017* -
## math

4cosx + 3 = 0

*asked on October 8, 2017* -
## S.S.

Who are the new United States governments of 2017?

*asked on October 2, 2017* -
## Statistics

The Jones family was one of the first to come to the U.S. They had 9 children. Assuming that the probability of a child being a girl is .5, find the probability that the Jones family had at least 5 girls.

*asked on October 1, 2017* -
## Statistics and Probability

A ticket in a typical lottery like Lotto 6/49 is usually $2. The probability of winning Lotto 6/49 is 1 in 13,983,816. The payoffs (jackpots) are usually in excess of $1 million. Suppose that you buy one ticket for $2 and the jackpot is $1 million. What is

*asked on September 29, 2017* -
## physics

The mars rover opportunity approached Mars on January 24th, 2004 and was moving with a velocity of 5.4km/s when it hit the atmosphere on its way to the surface at Miridani Planum. i)convert this speed to miles/hr. ii) If it took the lander 6 minutes to hit

*asked on September 23, 2017* -
## algebra

identify if the given functions are one to one 1. f(x)=x^3-7x 2. g(x) = square root x-3+1 3. h(x)=4x^4-2x^2+11

*asked on September 12, 2017* -
## Physics

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 34.0 m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air

*asked on September 9, 2017* -
## Policy

What was the Peel Commission and what were the recommendation about Palestine?

*asked on September 2, 2017* -
## Middle East

During the Colonial history of the Middle East, what were some of the countries interested in the Middle East?

*asked on September 2, 2017* -
## Science

Can someone help me come up with a way the lithosphere and cryosphere interacts? I already have permafrost.

*asked on August 28, 2017* -
## Geometry

N is between points M and P. MN = 17 NP = 3y MP = 5y + 9 Find MP.

*asked on August 26, 2017* -
## Chemistry

Calculate % of lowering of vapour pressure if 36 g glucose is added in 312g of benzene

*asked on July 24, 2017* -
## Physics

Suppose you are provided with 500 dice.calculate the number of throws that is equivalent to one half life and the decay costant for the process.under radioactivity decay analogue experiment

*asked on May 19, 2017* -
## Physics

To make ice cubes you fill am ice tray with 150g of water at 20°C. How much energy must be removed from the water to create ice cubes at a final temperature of -10C

*asked on April 12, 2017* -
## Algebra

Find the zeros of the function f(x)=(m^2-9)(9m^2+24m+16)

*asked on March 28, 2017* -
## Algebra

A rectangle's width is 6 inches less than its length. If it's area is 216 square inches find the dimensions of the rectangle. Write an equation and solve

*asked on March 28, 2017* -
## Algebra

A triangle has a height that is 4 inches less than its base. If the triangle has an area of 86 square inches, set up and resolve an equation to find its base and height.

*asked on March 28, 2017* -
## Math

I'm a dad trying to help my daughter. Question is kx+6y-5=0 3x+2y+4=0. Need to find 1. Value of k such that the lines are perpendicular and 2. The angle of inclination of the second line given

*asked on March 9, 2017* -
## Math

Why is log1/a(x), a reflection over the x axis?

*asked on February 28, 2017* -
## Algebra

A rectangle's length is 6 less than twice its width. The perimeter of the rectangle is 36 units. Set up and solve a system of equations to determine the length and width.

*asked on February 26, 2017* -
## Algebra

A boat traveled 180 miles downstream and back. The trip downstream took 10 hours. The trip back took 30 hours. Find the speed of the boat in still water and the speed of the current. Solve each system using any method

*asked on February 26, 2017* -
## Math

Describe transformations of f(x)=-f(2-x)

*asked on February 17, 2017* -
## Calculus

Air is being pumped into a spherical hot air balloon at a rate of 50 cm^3/min. Determine the rate at which the radius of the balloon is increasing when the diameter of the balloon is 200 cm.

*asked on February 15, 2017* -
## Help math

find 2 exponential functions with asymptote of y=80 , with points (0,176) (1,169) (3,156) (5,146) (20,101) (30,90) (60,81).one should have the base of "e"

*asked on February 14, 2017* -
## Pre calculus

find 2 exponential functions with asymptote of y=80 , with points (0,176) (1,169) (3,156) (5,146) (20,101) (30,90) (60,81).one should have the base of "e"

*asked on February 14, 2017* -
## Calculus

A hang glider is standing at the top of a 3,000 foot cliff. The hang glider jumps off and begins to descend at a constant rate of 50 feet per second, how fast is the area of the triangle formed by the cliff, the hang glider, and the ground changing at the

*asked on February 13, 2017* -
## Algebra

When swimming in the direction of the current in a river your average speed is 5 mph. When swimming against the current your speed is 2mph. Find your swimming speed in still water and the speed of the current.

*asked on February 12, 2017* -
## Algebra

A cashew and raisin mixture costs $2 per pound. You buy a 4.5,pound mixture of cashews and raisins. If cashews cost $2.50 per pound and raising cost $1.25 per pound, how many pounds of cashews and how many pounds of raisins make up the mixture?

*asked on February 12, 2017* -
## Algebra

John and Kathleen each improved their yards planting rose bushes and shrubs . They bought their supplies from the same store. John spent $228 on 12.rose bushes and 11 shrubs. Kathleen spent $108,on 6 rose bushes and 5 shrubs. Find the cost of one rose bush

*asked on February 12, 2017* -
## Algebra

Write a system of equations to solve each word problem. You deposit a total of $900 in two different accounts. One account provides an interest rate of 5% while the other account provides an interest rate of 8%. If you earned a total of $64.50 in interest

*asked on February 12, 2017* -
## Algebra

Set up a system of equations for each word problem One scuba diver starts at a depth of 12 meters below the water's surface and ascends at a rate of 1 meter per second. A second diver starts at a depth of 15 feet and ascends at a rate of 2 meters per

*asked on February 12, 2017* -
## Math 10C

Janet needs a rectangular piece of cardboard measuring 21 ft by 24 ft for a school project. a) What is the area of the cardboard in square feet? b) What is the area of the cardboard in square yards? Show your calculations in two different ways. c) The

*asked on February 7, 2017* -
## Foods and Nutrition

Which foods contain the most protein?

*asked on February 6, 2017* -
## Physics

Name any Margins of error that would happen in the lab "Which path requires the most energy? (gas)

*asked on February 5, 2017* -
## Math

The number has four digits. It is greater then 11,but less then 12. The sum of the four digits is 13. The digit in the hundreds place is 6. What is the number

*asked on February 5, 2017* -
## French

How does "Le Louvre", a museum in Paris, France connect to French Culture?

*asked on February 5, 2017* -
## Math

The coordinates of the midpoint of the line AB are (1, 2). The length of the line AB is 10 units. If the gradient of AB is 0, find the coordinates of A and B

*asked on February 1, 2017* -
## math

An automobile is traveling at 65 mph. If each tire has a radius of 15 inches, at which rate are the tires spinning in revolutions per minute (rpm)? (63360in=1 mile)

*asked on January 21, 2017* -
## Algebra

Find the value of x so that the line through the points has the given slope (2,2) and (x,9);slope: undefined

*asked on January 19, 2017* -
## Math

Write an equation in point-slope form to represent the situation. Assume a linear relationship between the given quantities. In 1998, the deer population of a certain area was 1200. In 2006, the population was 2000.

*asked on January 19, 2017* -
## Math

Find the slope of the line through each pair of points. Simplify as much as possible (-2g,6h), ( 2i,7g)

*asked on January 19, 2017* -
## pre-Calculus

Make a conjeture about the symmetry of a) a product of two odd functions b) a product of two even functions c) a product of an odd function and an even function

*asked on January 10, 2017* -
## Pre-Calculus

Tommy is building a rectangular playpen for his pigs where one side of the play area is a side of his barn. He has enough material to make a fence with a total length of 160 feet. write a función that represents the playpen's área in terms of its length

*asked on January 8, 2017* -
## Science

Where can I find a pie chart that shows the percentage of resources used to generate electricity in the United States in 2015?

*asked on December 8, 2016* -
## Math

You do not have enough 6-inch beads to make the rope, so you will use 10-inch beads instead. Write and solve an inequality that represents the number of 10-inch beads that you can use.

*asked on December 2, 2016* -
## physics

A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 2, what distance must the spring have been compressed?

*asked on November 18, 2016* -
## Math

How many volleyball games would Rana have to schedule if there were 10 teams in the league and each team played each other twice?

*asked on November 9, 2016* -
## pre-calculus

Assume that the number of bacteria follows an exponential growth model: P(t)=P0ekt . The count in the bacteria culture was 900 after 20 minutes and 1600 after 30 minutes. (a) What was the initial size of the culture? (b) Find the population after 80

*asked on November 7, 2016* -
## Physics (Mechanics)

A student of mass M = 62 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 19 m. The normal force by the track on the student at the top of the loop-the-loop is N1 = 100 N Find the speed of M at

*asked on October 26, 2016* -
## Physics (Mechanics)

A 905 kg car moves in a circle of radius 13.1 meters in a flat parking lot. If the car can travel at 9.1 m/s without slipping, what is the force of friction between each tire and the parking lot? What is the coefficient of friction between each tire and

*asked on October 26, 2016* -
## Physics

You push a 1kg block against a spring with spring constant k = 100 Nmon a horizontal table top. The spring is compressed to 0.2m away from its relaxed length, and then the block is released. If the horizontal table top has a coefficient of kinetic friction

*asked on October 23, 2016* -
## Physics (Mechanics)

Two blocks with equal masses m1 = m2 3.2 kg are connected via a pulley as shown in the above figure. Take the coefficent of kinetic friction to be 0.3 and the angle of the incline to be 40 degrees. Find the acceleration given that (Note: enter a negative

*asked on October 17, 2016* -
## Physics (Mechanics)

A block of mass m1 hangs vertically and is attached by a string to a block of mass m2 on a frictionless slope inclined at angle theta to the horizontal, as shown above. If m1 = 2.5 kg, it accelerates at -0.108 m/s2. If m1 = 0.8 kg, it accelerates at 2.888

*asked on October 17, 2016* -
## Mechanics

Two blocks with equal masses m1 = m2 3.2 kg are connected via a pulley as shown in the above figure. Take the coefficent of kinetic friction to be 0.3 and the angle of the incline to be 40 degrees. Find the acceleration given that (Note: enter a negative

*asked on October 14, 2016* -
## Mechanics

A block of mass m1 hangs vertically and is attached by a string to a block of mass m2 on a frictionless slope inclined at angle theta to the horizontal, as shown above. If m1 = 2.5 kg, it accelerates at -0.108 m/s2. If m1 = 0.8 kg, it accelerates at 2.888

*asked on October 14, 2016* -
## geometry

The measure of the supplement of an angle is three times the measure of the complement. Solve for the angle. I just want to find the equation but I do not understand it. I know that the angle is 40 degrees. Please teach me how to find the equation

*asked on October 13, 2016* -
## Statistics

23 children born. What is the probability that 22 are boys & 1 is a girl?

*asked on September 28, 2016*