# steven

Newest questions and responses by steven-
## Physics

A uniform ladder of mass 30kg and length 5m rest against a smooth vertical wall with its lower end on a rough ground. The coefficient of friction is 0.4.the ladder is inclined at 60 degrees to the horizontal. Find how far a man of mass 80kg can climb

*asked on October 21, 2018* -
## France

What happened during the 1948 War?

*asked on October 30, 2017* -
## France

When did France grant independence to Syria?

*asked on October 30, 2017* -
## Chemistry

For the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) ΔH = -2511 kJ What is the enthalpy change when 2.80 g of C2H2 (g) reacts with excess oxygen.

*asked on October 29, 2017* -
## Math geometry

The surface area of a cube is 96in2.what is the volume of the cube?

*asked on April 23, 2017* -
## Chemistry

If one wanted to a make a 500.0 mL of 4.5 x 10-6M solution of this red dye, how many grams would they need to weigh out? The molar mass of the dye is 492 g/mol. SHOW WORK.

*asked on February 16, 2017* -
## math

After a drought, the Great Salt Lake in Utah covered an area of 2450 kilometers squared or 35/64 the area of the lake under normal weather conditions. Find the area of Great Salt Lake under normal weather conditions.

*asked on February 4, 2017* -
## physics

A long straight vertical wire of diameter 2.0mm carries a steady current upwards. At 30mm from the centre of the wire, the magnetic field strength is 0.10mT. Sketch a graph to show the variation of magnetic field strength from the wire surface to a

*asked on January 25, 2017* -
## maths please help me

NOTE: before you answer this question, please be aware that there aren't meant to be any full stops after the '2' or the 'i=0'. Also the underscores '-' represent how the following number is meant to be a lower case number. The ^ represents root numbers.

*asked on January 20, 2017* -
## mathss

Write the following polynomial in summation notation: 2 + 3x + 4x^2 + 5x^3

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

NOTE: before you answer this question, please be aware that there aren't meant to be any full stops after the '2' or the 'i=0'. Also the underscores '-' represent how the following number is meant to be a lower case number. The ^ represents root numbers.

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

Find all possible solutions in the range 0°≤ x ≤ 180° of the following equations: (a) cos x = sqrt(2) / 2 (b) tan x = sqrt(3) / 3 (c) sin x = sin60° (d) cos x = -1/2 (e) sin x = -1/2

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

An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is μ = 0.500, how far will the aeroplane slide before coming to rest?

*asked on November 5, 2016* -
## PHYSICS (REALLY DIFFICULT PLEASE HELP)

An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is μ = 0.500, how far will the aeroplane slide before coming to rest?

*asked on November 4, 2016* -
## Maths (really hard)

The points A(1,5) and B(9,3) are part of a triangle Î”ABC. The triangle has a right angle at A and and sides satisfy AB=2AC. Find a point C such that C lies above the line AB.

*asked on November 1, 2016* -
## maths

(a) Find the points which divide the line joining A(1,3) and B(-4,-1) internally in the ratios: (i) 1:2 (ii) 1:1 (iii) 3:1 (b) On the same x-y axes plot the point A(1,3) and B(-4,-1) and draw the line joining them. Add the three points which you calculated

*asked on November 1, 2016* -
## Maths

(a) Find the points which divide the line joining A(1,3) and B(-4,-1) internally in the ratios: (i) 1:2 (ii) 1:1 (iii) 3:1 (b) On the same x-y axes plot the point A(1,3) and B(-4,-1) and draw the line joining them. Add the three points which you calculated

*asked on October 31, 2016* -
## MATHS URGENT PLEASE HELP

The mid-point of the straight line joining A(4,-3), B(6,-2) is located at C. (a) Calculate the coordinates of C. (b) Verify your result by calculating the distances AC and BC and showing they are equal.

*asked on October 31, 2016* -
## MATHS URGENT PLEASE HELP

Calculate the lengths of the straight lines joining the following pairs of points, leaving your answers in surd form: (a) A(1,-5), B(6,10); (b) A(4,-3), B(7,6).

*asked on October 31, 2016* -
## Probability

A box contains 6 pagers. Assume any pager selected from the box is done randomly, and hence selections are independent from each other. The probability of a selected pager being defective is 0.25. Let X be the random variable for the number of defective

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

If the order doesn't matter, what is the probability of drawing 1 brown and 2 orange marbles from a bag containing 5brown, 6yellow, 4blue, 3green and 2orange? Is it 5/20* 2/19* 1/18 or do I use a formula with factorials?

*asked on October 3, 2016* -
## algebra

A bag of marbles contains 5 brown, 6 yellow, 4 blue, 3 green and 2 orange. What is the probability of: a) getting 3 yellow marbles, if 3 are taken at a time? b) getting 1 brown and 2 orange marbles, if 3 are taken at a time? a= 6/20* 5/19* 4/18 b=5/20*

*asked on October 3, 2016* -
## Geometry

Line MP bisects

*asked on September 10, 2016* -
## Algebra

What is the square root of 58 to the nearest integer.

*asked on September 8, 2016* -
## Science

Which of the following questions is outside the scope of science? a. how are religion and philosophy different b.what is the diet of an american alligator c. how do humans digest protein d. how does gravity affect an airplane's motion

*asked on September 1, 2016* -
## Economics

Consider a single price monopoly that faces a market demand curve for a good is given by the equation 𝑃=100−.1𝑄 and the total cost function is given as 𝑇𝐶=1000+20𝑄+.4𝑄2. a. What is the total fixed cost for this monopoly? P/TC

*asked on August 23, 2016* -
## math

Christine took out a 150-day loan for $2000 at 12% simple interest. After 60 days, she decided to make an early payment of $1000. What is the balance due on maturity date of the loan? (Round your answer to the nearest penny.)

*asked on August 2, 2016* -
## Maths

Mr Sanderson makes some cookies for a festival day. She gave 1/4 of the cookies to her sister and 1/3 of the remainder to a neighbour. If she had 120 cookies left, how many cookies did she make in the beginning? Linda spent 1/4 of her money on books, 1/3

*asked on July 15, 2016* -
## Math

X-3y=1 4x+5y=4 Solve the system of equations.

*asked on May 7, 2016* -
## Math

A 100 point test contains a total of 20 questions. The multiple choice questions are worth 3 points each and the short response answer questions are worth 8 pints each. Write a system of linear equations that represents this situation, my answer is to

*asked on May 6, 2016* -
## Math

So I'm doing solving system of equations, 2x+y=5 4x+2y=10 I found no solution that would fit it therefore they are parallel to each other. Am I correct?

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

The feasible region shown below is bounded by lines 2𝑥 − 𝑦 = 2 , 𝑥 + 𝑦 = 2 , and y = 0. Find the coordinates of corner point A

*asked on March 6, 2016* -
## Math

Jan is a 35-year-old individual who plans to retire at age 65. Between now and then $4000 is paid annually into her IRA account, which is anticipated to pay 5% compounded annually. How much will be in the account upon Jan’s retirement?

*asked on March 6, 2016* -
## math

Given the cost function, C(x), and the revenue function, R(x), find the number of units x that must be sold to break even. C(x)=86x+3080, R(x)+108x

*asked on January 28, 2016* -
## Calculus III

The surface x^2−y^2=36 can be described using spherical coordinates in the form ρ=g(θ,ϕ)=

*asked on November 30, 2015* -
## Calculus III

Evaluate ∭W f(x,y,z)dV for the function f and region W specified: f(x,y,z) = 18(x+y) W: y≤ z≤x ; 0≤y≤x ; 0≤x≤1 ∭W (18(x+y))dV =

*asked on November 24, 2015* -
## Science

how the volume of air in a tank of compressed air would change if the volume of the tank doubled? My answer was: The volume of the air would increase and it would be more difficult to fit inside of the tank depending on if the tank was filled or not.

*asked on November 18, 2015* -
## chemistry

A viral preparation was inactivated in a chemical bath. The activation process was found to be first order in virus concentration. The beginning of the experiment 2% of the virus was found to be inactivated per minute. [i] Evaluate k for the inactivation

*asked on November 11, 2015* -
## Physics

A compact car of mass 915 kg has an overall motor efficiency of 16.0%. (a) If burning one gallon of gasoline supplies 1.34 108 J of energy, find the amount of gasoline used in accelerating the car from rest to 55.0 mi/h. Here you may ignore the effects of

*asked on October 27, 2015* -
## Calculus III

Compute the length of the curve r(t)=5ti+8tj+(t2+4)k over the interval 0≤t≤6 Hint: use the formula ∫t2+a2‾‾‾‾‾‾‾√dt=12tt2+a2‾‾‾‾‾‾‾√+12a2ln(t+t2+a2‾‾‾‾‾‾‾√)+C Find Length?

*asked on October 22, 2015* -
## Physics

Car A and B are facing each other at rest, 100 m apart. Car A accelerates at 5 m/s^2. Car B accelerates at 3 m/s^2. When and where do they meet?

*asked on September 22, 2015* -
## geometry

A circle has a center at (8,2). The point is (3,7) is on the circle. What is the area of the circle, to the nearest tenth of a square unit? A. 22.2 square units B. 44.4 square units C. 157.1 square units D.314.2 square units HELP PLEASE, and thanks.

*asked on September 16, 2015* -
## Geometry

What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit. PLEASE HELP. A. 36 UNITS B. 30 UNITS C. 22 UNITS D. 11 UNITS

*asked on September 16, 2015* -
## Math

Which of the following is an asymptote of f(x)=(x^2+3x+2)/(x+2)*tan(pi*x)? A) x=-2 B) x=-1 C) x=1/2 D) x=1 E) x=2 Answer is C but I got A because substituting x for -2 makes the graph undefined.

*asked on September 4, 2015* -
## Math

y-4=4x+3y=-(9-x) What is the value of xy?

*asked on August 29, 2015* -
## Math

5x/3+y=c 2y=c-4x x+y=6 What is c? I've tried substituting y as x-6 however I'm still not getting it.

*asked on August 29, 2015* -
## Math

Explain how the graph of f(x) = ln x can be used to obtain the graph of g(x) = e^(x-2).

*asked on July 14, 2015* -
## macro

Assume that the utility function of a consumer is given by U = ln c1 + ln c2 The interest rate is given by 5% and the endowments are given by (y1, y2) = (100, 120). (a) Draw the budget constraint. (b) Calculate the consumption and saving in period 1. (c)

*asked on May 19, 2015* -
## Chemistry

how many grams of Nano3 are in 0.755 moles of nano3

*asked on April 1, 2015* -
## math

Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?

*asked on March 20, 2015* -
## Phyisics

1. Two concentric conducting spherical shells have radii of 0.126 m. and 0.225 m. The inner sphere bears a charge of -8.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum,

*asked on March 18, 2015* -
## Phyisics

3. A small sphere whose mass is 8.00E-03 g. carries a charge of 7.00E-08 C. It hangs from a silk thread which makes an angle of 30 degrees with a large charged, nonconducting sheet. Calculate the surface charge density (in coulombs/meter^2) for the sheet.

*asked on March 18, 2015* -
## math

Lexi and Maria had $250 altogether. After Lexi spent25of her money and Maria spent $40, they had the same amount of money left. How much money did Lexi have in the beginning?

*asked on March 12, 2015* -
## physics

a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the

*asked on March 10, 2015* -
## physics

4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?

*asked on March 10, 2015* -
## math

At what value(s) of x does f(x)=(-4x^4)+(2x^2) have a relative maximum?

*asked on February 2, 2015* -
## math

For what values of x is the graph y=2/(5-x) concave upward? x-5 x>5 no values of x

*asked on February 2, 2015* -
## Physics

A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m,

*asked on January 30, 2015* -
## Pre-Calc

Through how many radians does a circle of radius 1 foot rotate if it rolls 10 feet down the road?

*asked on January 16, 2015* -
## math

simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!

*asked on January 12, 2015* -
## math

simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)

*asked on January 12, 2015* -
## math

For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.

*asked on January 1, 2015* -
## math

For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.

*asked on January 1, 2015* -
## math

For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)

*asked on December 31, 2014* -
## Math

The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in

*asked on December 29, 2014* -
## algebra

someone know about adding and subtracting denominator

*asked on November 24, 2014* -
## algebra

Perform the indicated operation y/y-5+5/5-y

*asked on November 24, 2014* -
## algebra

Which of the following points lies on the circle whose center is at the origin and whose radius is 10 (-6,4) (/10,/10) (6,-8)

*asked on November 21, 2014* -
## algebra

The length of a rectangle is 3 more than twice the width. The area of the rectangle is 119 square inches. What are the dimensions of the rectangle? If x = the width of the rectangle, which of the following equations is used in the process of solving this

*asked on November 21, 2014* -
## algerbra

A triangle has sides of and 3. Which could not be the length of the third side if it is a right triangle? i need help anyone?

*asked on November 21, 2014* -
## algebra

Solve this quadratic equation x^2 + 5x + 3 = 0

*asked on November 21, 2014* -
## Science

"What amount of Barium hydroxide is needed to neutralize 500 kg of 18 molar Sulphuric acid?"

*asked on November 3, 2014* -
## Law

Discuss the power lies within the Parliament in UK and whether the power of parliament had been limited in the present day.

*asked on November 2, 2014* -
## physics

A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is

*asked on October 17, 2014* -
## Physics

A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the

*asked on October 15, 2014* -
## Physics

The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?

*asked on October 15, 2014* -
## Physics

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units

*asked on October 15, 2014* -
## Physics

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air

*asked on October 12, 2014* -
## Physics

A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which

*asked on October 10, 2014* -
## Physics

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest

*asked on October 7, 2014* -
## Physics

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

*asked on October 3, 2014* -
## Physics

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the

*asked on October 3, 2014* -
## PHYSICS

Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while

*asked on October 3, 2014* -
## PHYSICS

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance

*asked on October 3, 2014* -
## Physics

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

*asked on October 3, 2014* -
## Physics

A 36-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 185 J from 460 J. How high does she rise during this interval? Neglect air resistance.

*asked on October 3, 2014* -
## Physics

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the

*asked on October 3, 2014* -
## College algebra

There were 40,000 people at a ball game in Los Angeles. The days receipts were 298,000. How many people paid $12.00 for reserved seats and how many paid $5.00 for general admission?

*asked on October 1, 2014* -
## Reading/language arts

Write a sentence for the given topic, using a form of one of the following linking verbs in each sentence: smell, sound, feel, taste, grow. Use at least one predicate noun or predicate adjective in each sentence. 1) (dificulty or ease of writing) can you

*asked on September 27, 2014* -
## Physics

Consider two spherical stones with same density (mass per unit volume). The larger stone has radius R = 8.58 cm and the smaller stone has radius r = 3.37 cm. Find the ratio of the terminal speed in air of the larger stone to that of the smaller stone.

*asked on September 25, 2014* -
## Physics

Air rushing over the wings of high-performance race cars generates unwanted horizontal air resistance but also causes a vertical downforce, which helps the cars hug the track more securely. The coefficient of static friction between the track and the tires

*asked on September 25, 2014* -
## Physics

Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.20 s have elapsed?

*asked on September 25, 2014* -
## math

using comparative thinking which equations are true a.50+64=62+48 b.50+64=62+62 c.50+64=124+52 d.50+64=66+52

*asked on September 25, 2014* -
## PHYSICS

The weight of an object is the same on two different planets. The mass of planet A is only thirty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.

*asked on September 20, 2014* -
## Physics

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.06 105 m/s to a final velocity of +2.03 106 m/s while traveling a distance of

*asked on September 20, 2014* -
## physics

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.850 m/s at an angle of 34.3° above the table, and it lands on the magazine 0.0780 s after leaving the table. Ignore air resistance. How thick

*asked on September 14, 2014* -
## Physics

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.53 m. The stones are thrown with the same speed of 8.62 m/s. Find the location (above

*asked on September 13, 2014* -
## Physics

How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?

*asked on September 11, 2014* -
## Chemistry

how many moles of oxygen are needed to react with 3.5 moles of isopropyl alcohol, C3H7OH

*asked on June 5, 2014* -
## Multiple Choice

Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point?

*asked on May 8, 2014*