Sunday

October 23, 2016
Total # Posts: 1,346

**math**

A certain number was increased 5 times, then decreased by 3, then halved. The result was 0.3 less than the original number. What was the original number?

*October 23, 2016*

**Physics**

A 1.11 kg toy train rolls around a circular horizontal track. If the train has an angular acceleration of -2.2 rads/s2 and is released with an angular speed of 17.0 rpm, what time is required for the train to come to a complete stop?

*October 22, 2016*

**Physics**

A 51.6 g box is left 17.8 cm from the centre of a merry-go-round. If the box has coefficients of friction of μs = 0.790 and μk = 0.480 with the merry-go-round, what is the maximum speed of the merry-go-round without having the box slide off of the merry-go-round?

*October 22, 2016*

**honors chem**

10.00amu

*October 17, 2016*

**honors chem**

naturally occurring boron is 80.20% boron 11 (atomic mass= 11.01amu) and 19.80% of some other isoptopic form of boron. what must the atmoci mass be be in order to account for the 10.81 amu averafe atomic mass of boron? round to two decimal places i got 9.999 and rounded to 10.00

*October 17, 2016*

**Algebra**

A plane can fly 500 miles against the wind in the same amount of time that it can fly 775 miles with the wind. If the wind speed is 55mph, find the speed of the plane in still air.

*October 14, 2016*

**art**

this image was created by using basic math concepts that include all of the following except A)knowing how to create a pattern B)using understanding the angles of the shapes C) a basic understanding of different geometric shapes. D) applying appropriate formulas to determine ...

*October 5, 2016*

**Physics **

A man walks the distance of 8km in a direction of 20degrees east the walks another 6km in a direction 50degrees south east. Using vector diagrams find the magnitude and direction of the final displacement relative to the starting point.

*October 5, 2016*

**chemistry**

WHAT does it mean for a phase of matter to have a definite shape and volume

*October 4, 2016*

**Physics **

What happens to centripetal force when speed decreases, in the special case that the object continues moving in a circle of the same radius? A) The radius cannot stay the same. B) The force also decreases. C) The force increases. D) Speed does not affect centripetal force. E) ...

*October 1, 2016*

**Physics **

Why does "banking" or (tilting) a turning road create centripetal force? A) Because banking the corner keeps car from going too fast. B) Because the angle of the roadway creates a centripetal force. C) Because the angle of the roadway helps cars counteract friction. ...

*October 1, 2016*

**algebra 2 **

rationalize 7/ (cube root of 3) + 2

*September 30, 2016*

**algebra 2**

wait it tis, nevermind. im right ,

*September 30, 2016*

**algebra 2**

is that the same as 3 times the cube root of 25 divded by 5 ?

*September 30, 2016*

**algebra 2 **

how do you rationalize 3 divided by the cube root of 5 3/ cube root of 5

*September 30, 2016*

**english **

what is the speaker saying about her marriage vows in the fourth stanza in the wifes lament

*September 25, 2016*

**Physics**

Ximena stands near the edge of a cliff 20 ma bove her friend Javier. If she throws a ball to Javier at an angle = 30 below the horizontal and it reaches him in 1.0 s, ignoring air resistance, what was the magnitude of the sandwich's initial velocity? (use g = 10 m/s2)

*September 24, 2016*

**Physics**

Two kittens are running toward each other, one is named Chloe and the other is named Luna. Chloe runs at a speed of 2.80 m/s and Luna runs at a speed of 1.60 m/s. If Chloe jumps at an angle of 17.0° while still running toward Luna, at what distance from Luna should Chloe ...

*September 24, 2016*

**Physics**

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 4.90 m/s. You jump at an angle of 30.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.72 m away from you. If you are able to ...

*September 24, 2016*

**Physics**

A box of mass m slides down an inclined plane that makes an angle of φ with the horizontal. If the coefficient of kinetic friction is μk, find an expression for the acceleration of the box down the slope. The acceleration due to gravity is g. a. g ( cosφ + μ...

*September 23, 2016*

**Physics**

If C⃗ = -5 i^ - 3 j^ - 4 k^, what is C⃗ × j^?

*September 23, 2016*

**chemistry**

wait my answer is 0.8053mph

*September 21, 2016*

**chemistry**

36cm not 6

*September 21, 2016*

**chemistry**

6 cm/sec to mph i got 9.664mph

*September 21, 2016*

**math**

it is 5 digit even number, the digit 3 is in the hundreds place. The value of the digit 4 is 40.the digit 6 stands for 6 ones. The digit in the ten thousands place is twice the digit in the ten place. the value of the digit in the thousands place is 30 time the value of the ...

*September 20, 2016*

**spanish **

which neighborhood in chicago did cisneros live in from the house on mango street

*September 19, 2016*

**8th grade math**

How do you figure the height of a cube is the cubic inches if 750?

*September 15, 2016*

**math**

At the medal presentation, each person shook hands with every other person. If 10 handshakes took place, how many people were present?

*September 14, 2016*

**Chemistry**

Should've phrased it differently. I meant, why is CuSO4 and Ba(OH)2 given as aqueous solutions in the beginning? That's the problem I was given. I'm not sure why they're soluble when they're not "supposed" to be, according to my solubility rules.

*September 8, 2016*

**Chemistry**

Why is it that copper (II) sulfate with barium hydroxide --> copper hydroxide (solid) + barium sulfate (solid)? According to the solubility rules given to me by my professor, both are insoluble, and therefore should be labeled as solids. Is there something I'm missing ...

*September 8, 2016*

**Chemistry**

Why is it that copper (II) sulfate with barium hydroxide --> copper hydroxide (solid) + barium sulfate (solid)? According to the solubility rules given to me by my professor, both are insoluble, and therefore should be labeled as solids. Is there something I'm missing ...

*September 8, 2016*

**Physics**

If a 12v battery is in a circuit with two resistors. r1 and r2. R2 is 60ohms. A voltmeter measuring on either side of r2 gives a reading of 8v. Calculate the current in the circuit and the resistance of r1. Am I right in thinking the v = i/r 8 = 7.5 / 60 so the current is 7....

*June 19, 2016*

**computer science**

QUESTION 1 When using the OR logical operator to connect 2 conditions to create a complex Boolean expression, neither the first condition nor the second condition has to be true for the complex Boolean expression to be true. True False QUESTION 2 String comparisons are ...

*June 18, 2016*

**INT 1111**

1.True 2.False 3.False 4.True 5.False 6.True 7.True 8.False 9.True 10.True

*June 18, 2016*

**INT 1111**

QUESTION 1 When using the OR logical operator to connect 2 conditions to create a complex Boolean expression, neither the first condition nor the second condition has to be true for the complex Boolean expression to be true. True False QUESTION 2 String comparisons are ...

*June 18, 2016*

**English **

rose asked katie do you know how to change a flat tire

*May 11, 2016*

**Math**

isoceles triangle with vertex of 45 degrees, base angles are 67.5 degrees. The 2 legs are 10' in length. What is the length of the base? (I am an older adult with minimal math skill. Just have a building project.)

*April 30, 2016*

**Maths**

The population of a colony of frogs under ideal condition double every 10 days. Solve the the equation 2 raised to the power of n equals 50 (2^n =50)to work out how many 10 days period it takes for the population to be 50 times as large as it is now. Hence, write down this ...

*April 29, 2016*

**economics**

Part 1 A firm has the current liabilities and equity financing on its balance sheet. The firm has taxable income that puts it in a 38% federal tax bracket, and the state in which it operates levies a 6.5% income tax. Compute the firm’s weighted average cost of capital. ...

*April 25, 2016*

**Math**

What is the volume of a cereal box that is 2 inches thick, 12 inches high and 10 inches wide?

*April 22, 2016*

**physics**

so for the first part of the question.. I used f=((C+Vr)/c)*fs for moving towards and when its moving away, the sign changes to negative instead of positive right? But for the second part of the question,,, what formula do i use here? im a little confused here!

*April 16, 2016*

**physics**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...

*April 16, 2016*

**Chemistry**

Question Part Points Submissions Used It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body's mechanism for eliminating this heat. How many liters of water would have to be evaporated through ...

*April 13, 2016*

**PHYSICS!!**

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...

*April 11, 2016*

**Physics**

A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 40 cm. What is the spring constant of the spring? I don't understand what to do here

*April 10, 2016*

**PHYSICS!!**

Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in momentum of player a? b...

*April 10, 2016*

**Chemistry**

The reaction is 2Al+2NaOH+4H2O==> 2NaAl(OH)4+H2

*April 5, 2016*

**Chemistry**

If you produce 3.5 moles of H2, how many moles of aluminum did you use in the reaction?

*April 5, 2016*

**PHYSICS!!!!**

Can someone help me figure out what formula to use!!

*April 4, 2016*

**PHYSICS!!!!**

It is 5.0 km from your home to the Physics lab and your car is out of gas. You could run that distance at 10 km/h, which uses up energy at the rate of 700 W; or you could walk it leisurely at 3.0 km/h, which uses energy at 300 W. (a) Calculate how much energy both choices ...

*April 4, 2016*

**English Comp**

Parallelism can be defined as________.

*April 1, 2016*

**Physics**

A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71¡ã W] and the second stone moves away at a velocity of 1.25 m/s [N44¡ã E], what was the ...

*March 30, 2016*

**physics**

Driving down Highway 401 in Ontario, it had rained and stopped raining by the time I came to the freezing rain on the highway. I knew there was a problem when the cars in front of me started to fly off the highway at the curve in the road. Assume the curve in the road is ...

*March 22, 2016*

**physics**

Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...

*March 14, 2016*

**physics**

After placing a 0.500 m dent in the landlords van, the two management students are told they and their 200 daN beer freezer have to go. The new ramp is inclined at an angle of 32.1 o relative to the horizontal. The coefficient of static friction between the freezer and the ...

*March 14, 2016*

**physics**

After placing a 0.500 m dent in the landlords van, the two management students are told they and their 200 daN beer freezer have to go. The new ramp is inclined at an angle of 32.1 o relative to the horizontal. The coefficient of static friction between the freezer and the ...

*March 13, 2016*

**physics**

Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...

*March 13, 2016*

**Physics **

Nicole is late for work. She jumps in her car and drives to work in 3.5 minutes. Her work place is 3.85 km away from her house. The speed limit between home and work is 50 km/hour. Is Nicole speeding?

*March 10, 2016*

**Physics **

Juliet sits on her balcony while Romeo serenades her from the ground, 7.00m below. To win Juliet’s affection, Romeo throws Juliet a bouquet of roses. At what velocity must the roses be thrown if they are to reach Juliet on the balcony?.

*March 10, 2016*

**Physics **

Gary and Elaine are competing as a team in an orienteering event. They follow instructions telling them to go 50 m [N], 75 m [NE] and 100 m [30o E of S]. a) Calculate the total distance travelled b) Draw a vector diagram to determine the resultant displacement.

*March 10, 2016*

**Physics**

Consider the hip joint. The bones are normally not in direct contact , but instead are covered with cartilage to reduce friction. The space between them is filled with synovial fluid, which reduces the friction further. Due to this fluid, the coefficient of kinetic friction ...

*March 8, 2016*

**Physics**

Consider the hip joint. The bones are normally not in direct contact , but instead are covered with cartilage to reduce friction. The space between them is filled with synovial fluid, which reduces the friction further. Due to this fluid, the coefficient of kinetic friction ...

*March 8, 2016*

**physics**

Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area A at the widest point. We can express this relationship mathematically as F~max= σA, where σ (sigma) is a proportionality...

*March 6, 2016*

**Chemistry 101**

the mass in the end is 35.0 grams

*March 4, 2016*

**physics**

*It was written on my homeowork that the answer for a=2.5m/s^2 and b=0.3m/s^2 but I don't know how they got that answer.

*February 29, 2016*

**physics**

Question: You live at the top of a steep (a slope of ???? degrees above the horizontal) hill and must park your 2200 kg car on the street at night. a) You unwisely leave your car out of gear one night and your handbrake fails. Assuming no significant frictional forces are ...

*February 29, 2016*

**physics**

Biophysics strikes back The Biophysics students are having their usual Saturday night biophysics party performing physics experiments at a classmate’s home. This Saturday it is in an apartment building and you notice a managemnt student (MS) passed out in the stairwell. ...

*February 29, 2016*

**physics**

Im just wondering how can you find the speed of the snowball at impact?

*February 23, 2016*

**physics**

A snowball rolls of a roof by accident. The roof is sloped 40.0 o relative to the horizontal. The edge of the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof. Ignore air resistance. Coincidentally, there is a group of ...

*February 23, 2016*

**physics**

A physics professor moonlights as a daredevil jumping things on a motorbike. His next stunt will be to jump the oldman river on his motorcycle. The ramp is being built 100 m above the river and made an angle of 50.0 o relative to the horizontal. The landing ramp will be 60.0 m...

*February 23, 2016*

**physics**

A physics professor moonlights as a daredevil jumping things on a motorbike. His next stunt will be to jump the oldman river on his motorcycle. The ramp is being built 100 m above the river and made an angle of 50.0 o relative to the horizontal. The landing ramp will be 60.0 m...

*February 21, 2016*

**Algebra**

Mrs. Rodrigues was selling two kinds of raffle tickets for $1.50 and $3.50. The number of $1.50 tickets sold was 5 more than three times the number of $3.50 tickets sold. She earned a total of $1,607.50. How many $1.50 tickets were sold?

*February 17, 2016*

**Algebra**

Mrs. Rodrigues was selling two kinds of raffle tickets for $1.50 and $3.50. The number of $1.50 tickets sold was 5 more than three times the number of $3.50 tickets sold. She earned a total of $1,607.50. How many $1.50 tickets were sold?

*February 16, 2016*

**math**

William recently inherited a large sum of money; he wants to use a portion of this money to set up a trust fund for his two children. The trust fund has two investment options: (1) a bond fund and (2) a stock fund. The projected returns over the life of the investments are 3...

*February 15, 2016*

**Chemistry **

A bolt is ordered with a thread of a diameter of 1.25 inches, what is the diameter in millimeters? If the order was mistaken for 1.25 centimeter by how many millimeters would the bolt be in error?

*February 14, 2016*

**Geometry**

2 similar rectangles have areas of 6in and 24 in. What is the scale factor of the smaller rectangle to the larger rectangle?

*February 10, 2016*

**Math (Please Help)**

B.dependent on... is the correct answer!!

*February 9, 2016*

**Physics Help!!!**

A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the tennis ball clears the ...

*February 9, 2016*

**physics**

A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the tennis ball clears the ...

*February 9, 2016*

**physics**

I just can't find out what direction it needs to go.

*February 9, 2016*

**physics**

Canadian snowbirds usually follow the I-15 at a speed of about 120 kilometers per hour. Canadian geese, on the other hand, migrate approximately along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 kilometers per ...

*February 9, 2016*

**physics**

Canadian snowbirds usually follow the I-15 at a speed of about 120 kilometers per hour. Canadian geese, on the other hand, migrate approximately along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 kilometers per ...

*February 8, 2016*

**physics**

A game of tennis... A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the ...

*February 8, 2016*

**physics**

Canadian snowbirds usually follow the I-15 at a speed of about 120 kilometers per hour. Canadian geese, on the other hand, migrate approximately along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 kilometers per ...

*February 8, 2016*

**physics**

A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the tennis ball clears the ...

*February 8, 2016*

**physics**

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. (See Nature, Vol. 424, 31 July 2003, p. 509...

*February 8, 2016*

**physics**

A ski jumper leaves a slope at an angle of 20.0 degrees above the horizontal direction. She lands 3.50 seconds later at a point 20.0 meters below her take-off point. (a) What was her initial speed? (b) How far does she travel horizontally?

*February 7, 2016*

**algebra**

Find the midpoint of the line segment joining the points P1 and P2 P1= (5,2) P2= (-4,3) tom

*February 5, 2016*

**algebra**

Find the midpoint of the line segment joining the points P1 and P2 P1= (5,2) P2= (-4,3) tom

*February 4, 2016*

**physics**

Falls resulting in hip fractures (or head injuries) are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact is about 2.0 meters per second. If this can be reduced to 1.3 meters per second or less, the hip will usually not fracture. ...

*February 1, 2016*

**physics**

It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ...

*February 1, 2016*

**Maths**

The volume of a pyramid with a square base is given by the expression 1/3s square h, where she is the length of a side of the base and h is the height. Find the volume of a pyramid with a square base of side length 24 feet and a height of 30 feet.

*January 31, 2016*

**College Algebra**

Find all real and complex roots and type complex answers in the form a+bi. x^4-9x^2+20=0

*January 30, 2016*

**math **

frank has 100 geese and cows on his farm. The animals have a total of 340 legs. How many geese and cows does frank have?

*January 29, 2016*

**physics**

(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...

*January 26, 2016*

**physics**

(a)The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates at a constant rate up to their maximum velocity, which is maintained for the remainder of the race, no matter how long it...

*January 26, 2016*

**physics**

A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...

*January 25, 2016*

**Physics**

(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...

*January 25, 2016*