# Posts by Tom

Total # Posts: 1,407

**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*

**Physics**

(a) A magazine article states that cheetahs are the fastest sprinters in the animal world and that a cheetah was observed to accelerate from rest to 70 kilometers per hour in 2 seconds. What average acceleration in meters per second squared does this require? (b) The article ...

*January 25, 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*

**geometry h**

The midpoint of Line AB has coordinates (-3,2) and the coordinates of point A are (1.4). What are the coordinates of point B?

*January 14, 2016*

**math**

y= mx + b (1/2) is the slope. m in the equation is the slope (0,5) x= 0 y or b= 0 y=1/2x + 5

*January 14, 2016*

**MATH HELP !!!!!**

Wow... thank you so much! Because I was wondering because I take health and it meets twice a cycle.

*December 19, 2015*

**MATH HELP !!!!!**

60 classes?

*December 19, 2015*

**MATH HELP !!!!!**

There are 180 days of school; 40 weeks. You have a six day cycle in your schedule. You have health twice a cycle (2 days out of 6 days in the six day cycle). How many classes of health?

*December 19, 2015*

**3rd grader**

How did you study multiplication fact?

*December 17, 2015*

**math**

what is the product of the number 27

*December 15, 2015*

**Chemistry**

Usually, copper should be reduced by the zinc, why does being in an alloy change this?

*December 9, 2015*

**Chemistry**

Alloys of copper and zinc are used to produce brass. Why do these elements not react in this application?

*December 9, 2015*

**Social Studies**

what are two actions outlawed by the english bill of rights?

*December 8, 2015*

**Precalculus**

2cos^2(theta) + Sin(theta)=1 I know I have to use the quadratic formula but i'm having trouble after I convert the Cos^2(theta) to (1-Sin^2(theta))

*December 2, 2015*

**Precalculus**

I have a precalculus test tomorrow and I've been studying nonstop for the past few days but I've been struggling because it has been 8 years since the last math class I have taken. My question is about half-angle formulas, My professor taught us that they are: Sin(...

*December 2, 2015*

**Chemistry**

Benadryl is an over-the-counter drug used to treat allergy symptoms. The formula of benadryl is C17H21NO. How many moles of C are present in 0.759 mole of benadryl?

*November 27, 2015*

**algebra**

the length of a rectangle is 10 feet more than twice the width. The perimeter is 110 feet. Find the dimensions.

*November 25, 2015*

**Chemistry**

An aqueous solution of KF is add dropwise to an aqueous micture containing 0.25M Ca2+ and 0.75M Mg2+ calcuate the minimum molarity of F that is nessaryvto initate the precipitation of each salt? Which precipitate first? Ksp of CaF2 :5.4x10^-9 Ksp of MgF2 :3.6x10^-8

*November 21, 2015*

**school math 3rd grader**

how you find the solution to your subtraction problem without doing any calculation, Damon? explain

*November 18, 2015*

**school math 3rd grader**

how you write a subtraction word problem related to this addition word problem Ms Sue?

*November 18, 2015*

**school math 3rd grader**

how u find solution for addition problem Ms Sue ?

*November 18, 2015*

**school math 3rd grader**

Meg spent $3.75 on candy and $4.89 on toys. How much did she spend in all? Find the solution to your subtraction problem without doing any calculation. Explain.

*November 18, 2015*

**school math 3rd grader**

how to find solution to subtraction problem without doing any calculation. explain?

*November 18, 2015*

**Algebra 2**

Simplify the following exponents. (3x^ay^bz^c)(-y^fz^g)

*November 12, 2015*

**Algebra 2**

Simplify the following exponents. (3m^2n^7/m)^5

*November 12, 2015*

**Algebra 2**

A share of ABC stock was worth $60 in 2005 and only worth $45 in 2010. Find the multiplier and the percent decrease.

*November 12, 2015*

**algebra1**

6 + x/-8 = 4/7 what does x =

*October 3, 2015*

**AP Calculus**

a norman window is constructed by adjoining a semicircle to the top of an ordinary rectangular window. find the dimensions of a norman window of maximum area if the total perimeter is 72 units. Base value is 21.

*October 1, 2015*

**Fire protection eng**

20,500 gallons of kerosene spill into a banked up area that measure 20 foot x 10 foot how long will the fire last it is left unattended ? 1 gallon = 3.785 liter 1000 liters = 1 m^3 1in = 2.54 cm 1ft = 12 in

*September 29, 2015*

**science**

so using an instrument to extend the power of an observation isnt itself an observation?

*September 25, 2015*

**science**

i put 2 on my test can u explain why its 2.

*September 25, 2015*

**science**

a student is observing a rock. which of the follwoinf is an observation 1. the rock is 55g in mass 2. the rock is over billions of years old

*September 25, 2015*

**Object oriented programming**

The Romance World Cruise Line provides special gifts for passengers who are newlyweds, as well as for those who have been married more than 40 years. Design a pseudocode for a program that accepts a couple's last name, ship cabin number, and number of years married. ...

*September 24, 2015*

**Programming**

What's the rest of the the pseudocode

*September 22, 2015*

**College Physics**

At a firing range, a target is placed 300 m from where someone is firing a rifle. The muzzle speed of this rifle is 700 m/s. If the rifle is aimed directly at the center of the target, by how far will the target miss? At what angle would the rifle need to be aimed at to hit ...

*September 14, 2015*

**Precal**

The velocity v of a fluid flowing in a conduit is inversely proportional to the cross- sectional area of the conduit.( Assume that the volume of the flow per unit of time is held constant .) Determine the change in the velocity of water flowing from a hose when a person places...

*September 10, 2015*

**Math**

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of −0.6 Suppose that the height of the candle after 19 hours is 9.6 centimeters. What was the height ...

*September 8, 2015*

**Math**

Are you going to wait the four hours until the quiz expires or do you have a plan B?

*September 7, 2015*

**Math**

Scores not possible are: 1,2,4,5,8,11....and then what? 12 = 4 x 3 13 = 7+3+3 14= 7 x 2 and every number higher has to be possible because we have 12, 13, and 14 possible, and any higher number can be obtained by adding 3 to any of these 3. So, 11 is the highest number that is...

*August 24, 2015*

**JOb interview**

here are a few people in line waiting to be served. You are taking care of one customer and she insists you gave her the incorrect change. You know you didn't. What do you do?

*August 17, 2015*

**JOb interview**

here are a few people in line waiting to be served. You are taking care of one customer and she insists you gave her the incorrect change. You know you didn't. What do you do?

*August 17, 2015*

**JOb interview**

here are a few people in line waiting to be served. You are taking care of one customer and she insists you gave her the incorrect change. You know you didn't. What do you do?

*August 16, 2015*

**JOb interview**

Briefly explain why you feel you are the ideal candidate for this position.This field is mandatory

*August 16, 2015*

**JOb interview**

Please provide an example of your best customer service situation. Explain why the service you provided was so successful

*August 16, 2015*

**JOb interview**

here are a few people in line waiting to be served. You are taking care of one customer and she insists you gave her the incorrect change. You know you didn't. What do you do?

*August 16, 2015*

**alg1**

solve for 8m^2 +20m=12 for m by factoring

*August 5, 2015*

**Math velocity**

A ball is thrown straight up from the edge of the roof of a 60.0 m tall building. If a second ball is dropped from the roof 2.0 s later what must the initial velocity of the first ball be if both are to reach the ground at the same time?

*June 22, 2015*

**MATH URGENT**

find the average rate of change between f(-4) and f(-1) in the function f(x)= x^2+2x-8

*June 1, 2015*