Sunday

February 26, 2017
Total # Posts: 631

**Physics**

Okay, I used Fc=mv^2/r and got 690.14 N. I used 83.6kg for m, 7574 for v, and 6,949,000 for r. Does that sound right? Thanks.

*February 22, 2017*

**Physics **

Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What I've got so far...

*February 22, 2017*

**Physics**

I have already calculated the mass using volume multiplied by density and the resulting answer was incorrect. However, I just realised that I had forgotten to convert the mass from grams to kilograms. Thanks for your help.

*February 17, 2017*

**Physics **

Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat the platter as a solid...

*February 17, 2017*

**Physics **

Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum on Earth is l, what should the ...

*February 14, 2017*

**math**

ok...I got b=0, a=5/24, c=19/24 is that right?

*February 13, 2017*

**math**

oh sorry P=(-1,1)

*February 13, 2017*

**math**

There is a unique parabola that goes through the points P = ( 1, 1), Q = (1, 1), and R=(5,6) that can be described by y=ax^2 +bx+c. Find coefficients a, b, and c.

*February 13, 2017*

**Math**

By letting x=5^y, show that the equation p5^y + 5^-y = 5 can also be written as px^2-5x+1 = 0

*February 9, 2017*

**Mathematics**

Solve the simultaneous equation: x^2 + y^2 = 13 and x + 3y = -3

*February 9, 2017*

**math**

Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

*February 8, 2017*

**Math**

How many pieces 3/7 of a foot each can I make out of 7/2 feet of rope?

*February 2, 2017*

**PLEASE HELP**

Find the volume of a cone of height 8 centimeters and base radius 6 centimeters. This cone is sliced by a plane that is parallel to the base and 2 centimeters from it. Find the volumes of the two resulting solids. One is a cone, while the other is called a frustum.

*January 31, 2017*

**math**

Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have? 13 apples 8-3=5 green 8+5=13

*January 25, 2017*

**riddle**

Its new and old at the same time

*January 17, 2017*

**Science**

The offspring will have black fur because BB Bb Bb bb because there is a 75% chance of getting black fur since on one is recessive. The answer is black fur.

*January 16, 2017*

**Honors English 9**

What are examples of characterization in Antigone? This is a review question in a small packet that follows every book. I have no recollection of reading direct characterization and our books are taken at the end of each quiz.

*January 3, 2017*

**Chemistry**

The specific heat of silver is 0.24 J/g*C. If 15.4 g of silver absorb 332 J heat, how much will the temperature of the silver increase?

*December 20, 2016*

**biology**

There is a 25% of the offspring being red because... BB Bb Bb bb

*December 16, 2016*

**Physics**

A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the surface? Am I right to...

*December 15, 2016*

**physics**

A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits the ground?

*December 15, 2016*

**MATH**

If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum

*December 1, 2016*

**Math**

Find the asymptote of (3)/(2x^(2)+3)

*November 29, 2016*

**Maths**

Find the vertical asymptote of the following curve: (5x+3)/(e^(x)-1)

*November 28, 2016*

**Physics**

A force F =(8.700 N)i +(?9.000 N)j F?=(8.700 N)i +(?9.000 N)j is exerted on a particle located at r=(?8.400 m)i +(7.700 m)j r?=(?8.400 m)i +(7.700 m)j. What is the torque on the particle about the origin?

*November 23, 2016*

**Math**

The first number is the price of 1 ounce of soda if 64 ounces cost $1.92

*October 30, 2016*

**algebra 1**

Susie wants to have at least a 90 average for the year in her Algebra class. Her current test scores are 85, 100, 86, and 97. What does she need to score on her fifth test to have at least a 90 average?

*October 29, 2016*

**Chemistry**

What is NaOH?

*October 25, 2016*

**Math**

A sample of 120 bags of potatoes produced by a factory was found to have a mean weight of 2.47 kg and a standard deviation of 0.12 kg. Obtain a 95% confidence interval for the mean weight of all bags of potatoes produced by the factory.

*October 24, 2016*

**Physics**

Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic friction between the dresser...

*October 20, 2016*

**Algebra**

Tire pressure is directly proportional to temp on a temp scale where zero degrees is absolute zero. given that temp in degrees celcius and degrees Fahrenheit are related by the formula F=9/5C +32 and absolute zero is -273.15C, by what % does tire pressure decrease when the ...

*October 18, 2016*

**Mathematics**

If we require a margin of error of x% for the sample size n, express n in terms of x.

*October 18, 2016*

**Physics**

Never mind, I figured it out as normal force is really simple but the distance part was confusing me. Thanks for reading it anyway.

*October 17, 2016*

**Physics**

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

*October 17, 2016*

**Math**

X is a normal variable with mean 9. If P(X > 12) = 0.0062, calculate the standard deviation, the standard deviation if X.

*October 15, 2016*

**math**

60% of the students in a school are boys. 70% of the boys and 40% of the girls wear glasses, how many students are there in the school?

*October 14, 2016*

**Math**

If P(a<X<b) = 0.48 and P(0<X<a) = 3 x P(b<X<12), calculate P(b<X<12) and calculate P(0<X<b).

*October 6, 2016*

**history**

explain the relationship of Spindletop's location in Texas to it's importance on the economic development of Texas and the United States.

*October 5, 2016*

**Math**

During the Great Singapore Sale, Mr. Chen bought a digital camera for $810. This was 90% of the usual price How much was the discount

*October 3, 2016*

**Physics**

You're driving parallel to train tracks at 40.0 km/h when a train passes you, going a steady 105 km/h. A track crossing is up ahead, so you begin to speed up at 6.50 m/s2. How far do you drive before you pass the train?

*October 2, 2016*

**Calc AB**

Given y=32t2 +16t+64, what is D2/t [y]? A.-64 B.-32 C.16 D.-64t+6**

*October 2, 2016*

**Physics**

A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

*September 29, 2016*

**Physics**

A quarter on a spinning vinyl record has a centripetal acceleration of 31.8 m/s2. What is the acceleration of the quarter if it is placed twice as far from the centre of the vinyl record?

*September 29, 2016*

**Math**

a pie chart is drawn to represent the numbers x,2x and x+4. If the angle at the centre representing x is 75 degrees, find x

*September 27, 2016*

**Maths**

a pie chart is drawn to represent the numbers x,.2x.and x+4. If the angle at the centre representing x is 75 degrees, find x.

*September 27, 2016*

**math**

a respie requires 2 cups of flour to make 10 servings and 8 cups of flour to make 40 servings. How many cups of flour are needed to make 30 servings

*September 23, 2016*

**Math :)**

A pie chart is drawn to represent the numbers x, x+2 and 8. If the angle at the centre of the sector representing x+2 is 120 degrees, find the value of x.

*September 21, 2016*

**Math**

Does expressing a number in scientific notation change the value of the number (being expressed)?

*September 15, 2016*

**Math**

A fair eight-sided die is rolled six times. A success is getting a 6, 7 and 8. Find the probability of getting three successes.

*September 13, 2016*

**Math**

A fair coin is tossed six times. Find the probability of getting head, head, head, head, tail, tail in that order

*September 12, 2016*

**maths**

Seven times a certain number is the same as nine more than four times the same number. Find the number.

*September 12, 2016*

**Math**

A bag contains 8 white, 6 black and 4 red discs. They are selected at random and not replaced. What is the probability that there is at least one black disc in the first four discs drawn out of the bag?

*September 9, 2016*

**Math**

Six points lie on the circumference of a circle. How many different triangles can be drawn having some of these points as vertices?

*September 1, 2016*

**Math**

A rectangular garden is 30 m long and 20 m wide. A path of uniform width is set around the edge that reduces its area to 375m^2. What is the width of the path?

*August 28, 2016*

**English**

Wilfrid Laurier, John A. Macdonald, Queen Elizabeth II, William Lyon Mackenzie King, ______ ______.

*August 12, 2016*

**Maths**

Alice & Phillis share some stickers. Alice has 5/7 as many stickers as Phyllis. Phyllis has 92 more stickers than Alice. How many stickers does Alice have?

*August 9, 2016*

**Math**

The temperature is 12 degrees lower that 4 hours ago. Write an integer equation for the situation and what is the average temperature change per hour? 12/4= 3 3 degrees is the average temperature change per hour.

*July 17, 2016*

**History**

Sorry It should be were the reformation and counter-reformation popular movements OR the carefully orchestrated manipulations of charismatic figures or both?

*June 29, 2016*

**History**

were the reformation and counter-reformation popular movements of the carefully orchestrated manipulations of charismatic figures or both? Why?

*June 29, 2016*

**chemistry**

You have a solution that contains 0.25g grams of oxalic acid dissolved in 100 mL of water. This solution is placed in a separating funnel, and the 100 mL of butanol is added to the solution. calculate the mass of oxalic acid in the organic solvent

*June 16, 2016*

**algebra**

$8000 principle earning 3% componded annually, 4 years. What will be the balance after 4 years?

*May 24, 2016*

**science**

PLz help

*April 28, 2016*

**science**

which of the following does not change when a car keeps a constant speed but changes direction

*April 28, 2016*

**life orietations**

Six ways that the human rights violations influences individuals and the broader south Africa community

*April 25, 2016*

**Life orientation**

Examples of human rights violations

*April 17, 2016*

**math**

A homeowner is selecting a pool with a perimeter of 54 meter to place in his back gard. Find the perimeter of the pool If the dimensions are cut in half.

*April 14, 2016*

**Chemistry**

Suppose a saturated solution of barium fluoride contains 1.5 x 10 ^ -2 M of F-. What is the Ksp of BaF2. I know that the balanced equation of this reaction is: BaF2 (s) --> Ba2+ (aq) + 2F- (aq) There is a 1:1 ratio between BaF2 and Ba2+ and there is a 1:2 ration between ...

*March 31, 2016*

**Math**

A recipe requires 3/4 cup of nuts for 1 cake. Enter the maximum number of cakes that can be made using 7 1/2 cups of nuts.

*March 30, 2016*

**Math**

A recipe requires 3/4 cup of nuts for 1 cake. Enter the maximum number of cales that can be made using 7 1/2 cups of nuts.

*March 30, 2016*

**physics 101**

A truck is moving at the speed of 30 miles per hour, what is it's speed in meter per second.

*March 20, 2016*

**math**

What is the volume of the cone in the picture if S = 5 and R = 3?

*March 6, 2016*

**Operations Management**

Consider the following system: -> 0.73 -> 0.73 -> Determine the probability that the system will operate under each of these conditions: (Round your final answers to 4 decimal places, not your intermediate calculations.) a.) The system as shown b.) Each system ...

*March 6, 2016*

**Chem**

Write the formulas of the compounds formed by Pb4+ with the following anions: CN−, ClO3−, SO42−, H2PO4−.

*March 4, 2016*

**Science**

What caused the ten years war

*March 4, 2016*

**4th grade math**

1/2

*March 4, 2016*

**Geography and Society**

Areas near the Equator. because the sun is very strong near the equator which means more evaporation happens. The more evaporation the more condensation. AKA the water cycle.

*March 1, 2016*

**Statistics**

In a shipment of 21 parts, four of the parts are defective. If three parts are selected at random without replacement, find the probability that : a.) All three parts selected are defective. 4/21*3/20*2/19=.003 b.) None of the tree parts selected are defective. 3/17*2/16*1/15...

*February 26, 2016*

**Life Orientation**

Crime

*February 21, 2016*

**social studies**

1. Many agree that Native Americans migrated from Asia as early as _______ years ago. (1 point) 2,000 5,000* 30,000 100,000 2. What country controlled the majority of the Americas in 1783? (1 point) Great Britain* France Spain Native American 3. The Treaty of _______, signed ...

*February 16, 2016*

**Math**

There is a bridge that is 1 mile long. You have a piece of steel cable that measures 1 mile and 1 inch. You get 2 very strong people to hold each end of the cable and stand at the ends of the bridge. You, also very strong, stand at the exact middle of the bridge and hold the ...

*February 15, 2016*

**English III**

That is correct. (Answer D)

*February 15, 2016*

**math**

7893.27

*February 15, 2016*

**11Science**

In spermatogenesis four sperm cells are produced from the original spermatocyte, while in oogenesis only one egg cell is produced from the original oocyte. Explain two reasons why this design increases the likelihood of fertilization and pregnancy.

*February 11, 2016*

**physical science**

a car accelerates from rest at stop street and covers 10m east in 45.calculate the acceleration of the car(assume uniform acceleration).

*February 10, 2016*

**chemistry**

A 7.30-L container holds a mixture of two gases at 45 °C. The partial pressures of gas A and gas B, respectively, are 0.410 atm and 0.620 atm. If 0.150 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

*February 4, 2016*

**Physics**

A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the ...

*January 28, 2016*

**math**

The population of Town A is 60000 and town B is 70000. Find the percentage of town A as town B

*January 27, 2016*

**maths**

The population of town A is 60000 and town B is 70000 find the percentage of town A as town B

*January 27, 2016*

**Physics**

An automobile traveling 50km/hr. It decelerates at 5 meter per second square. How long will it take to stop the car? How far will the car travel after a brakes are applied?

*January 11, 2016*

**Phiysics**

An automobile traveling 50km/hr. It decelerates at 5 meter per second square. How long will it take to stop the car? How far will the car travel after a brakes applied?

*January 11, 2016*

**Math**

Two parallel chords of length 20cm and 11cm lie on opposite sides of a circle. The distance between the two chords is 15cm. Calculate, correct to the nearest whole number the radius of the circle

*January 8, 2016*

**math**

Find the radius of the circle if an arc of length 8 ft on the circle subtends a central angle of 225°

*December 8, 2015*

**Math**

Ok so really all you have to do is multiply 5 by 2 and add a dollar sign. 2 times 5 is 10 so he spent $10.00

*December 7, 2015*

**chemistry**

how many grams of the solid can be formed from 206g of calcium nitrate and 140 g of phosphoric acid? answer in grams. I really need help and fast.

*December 3, 2015*

**Pre algebra**

Tropical storm alpha has winds of 50 miles per hour. Write and solve and an inequality to find how much of the winds need to decrease so that the storm is downgraded to 39. Please help, explain steps

*December 1, 2015*

**Social Studies**

When the Industrial Revolution started people replaced those who made things by hand with machines therefor the poor lost their jobs. The answer is B.

*December 1, 2015*

**Social Studies Check My Work**

I go to connections too and this is a quiz. You posted the entire quiz and I think you need to actually read the assingment and then take the quiz yourself WITHOUT having someone do it for you.

*November 25, 2015*

**HEALTH PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

Answers are B and C, D, A, C, and D. Just took the quiz.

*November 25, 2015*

**MATH**

Thank You I Got an 80

*November 5, 2015*

**MATH**

Simplify square root of 3 times square root of 21. A.Square root of 24 B.Square root of 63 C.3 Square root of 7 D.None of the above

*November 5, 2015*