Tuesday
September 30, 2014

Posts by Melissa


Total # Posts: 1,115

physics
The force of gravity at Earth's surface on an astronaut is 634N. What is the force of gravity on the same person at each of the following distances, in multiples of Earth's radius, from the centre of Earth? A)2 B)5 C)10 D)17.2
April 2, 2012

physics
The mass of Earth can be calculated using the fact that the weight of an object (in newtons) is equal to the force of gravity between the object and Earth. Given that the radius of Earth is 6.4*10^6m , determine its mass
April 2, 2012

physics
Any my text book for the 12.0kg steel ball it says the answer is 1.2*10^2N, not 117.6N how did they get that answer?
April 1, 2012

physics
Calculate Earth's force of gravity on each of two steel balls of masses 6.0kg and 12.0kg I the forces of gravity on the 12-kg ball is greater than that on the other ball, why do the two balls accelerate at the same rate when dropped?
April 1, 2012

Trigonometry
A ladder that is 15 feet long is placed so that it reaches from level ground to the top of a vertical wall that is 13 feet high A. Use the law of sines to find the angle that the ladder makes with the ground to the nearest hundredth B. Is more than one position of the ladder ...
March 27, 2012

physics
When the crampton coal-fired train engine was built in 1852 , its mass was 48.3t ( 1.0 t= 1.0*10^3) and its force capability was rated at 22.4 kN. Assuming it was pulling train cars whose total mass doubled its own was and the total friction on the engine and cars was 10.1 kN...
March 25, 2012

physics
When the crampton coal-fired train engine was built in 1852 , its mass was 48.3t ( 1.0 t= 1.0*10^3) and its force capability was rated at 22.4 kN. Assuming it was pulling train cars whose total mass doubled its own was and the total friction on the engine and cars was 10.1 kN...
March 25, 2012

physics
Lol :) thanks , i should have thought of that
March 25, 2012

physics
According to newtons 1st law , construction workers are warned not to leave their hard hats on the rear window ledge of their cars, explain why?
March 25, 2012

physics
Sorry i meant 4000 kg is the mass
March 25, 2012

physics
A jet plane pilot decides to accelerate horizontally. If the thrust of the engine is increased to 50 000 N at a time when the air resistance ( or drag) acting on the 4000kg plane amounts to 30 000 N , what will the planes acceleration be I believe you at the 50 000 and the 30 ...
March 25, 2012

physics
Thank you so much I understand now !
March 25, 2012

physics
How much applied force is needed to accelerate a 2.0 kg block of wood at 4.0m/s^2 along a rough table, against a 10 N force of friction?
March 25, 2012

physics
Thank you for helping me ! It takes me a little bit longer to grasp concepts, i think now the correct answer is it is unbalanced because it accelerates?
March 25, 2012

physics
Is the net forces balanced because it accelerates steadily in a straight line?.
March 25, 2012

physics
I have no clue we never covered it in class!
March 25, 2012

physics
A 1200 kg boat accelerates steadily at 0.05 m/s^2 in a straight line . Are the forces on this boat balanced or unbalanced?
March 25, 2012

physics
The force of friction is zero?
March 25, 2012

physics
A woman pushes a refrigerator across the floor at a steady speed of 20cm/s . If she has to push with a horizontal force of 400 N to keep it moving , is the force of friction less than 400 N , 400 N, more than 400 N, why
March 25, 2012

physics
Thank you so much, i understand a lot more now !
March 25, 2012

physics
A jet plane is traveling at a constant speed in a straight line in level speed. What does this tell you about the forces acting on it, what forces are acting on it .
March 25, 2012

physics
thank you bobpursley
March 23, 2012

physics
A triathlete swims 1200 m due to east followed by 1500 m due northeast (45o). What is the overall displacement? (magnitude and angle). Calculate the displacement with long-hand calculations.
March 23, 2012

physics
Thanks bobpursely I need this for my Quantitative Biomechanics class
March 23, 2012

physics
A diver is jumping straight up with 2 m/s from a 15 meter platform. Calculate the maximum height of the diver, the diver’s velocity when reaches the water, and total time to reach the water.
March 23, 2012

Calculus
A rectangular prism is defined by vectors (2,0,0) (0,9,6) and (0,0,3). Find the volume.
March 22, 2012

Geometry
The height of the segment from the apex of the cone to the base is 10 feet. The length of the diameter of the circular base is 4 feet. Calculate the volume
March 22, 2012

Geometry
The height of the segment from the apex of the pyramid to the base is 10 feet. The length of the diagonal of the square base is 4 feet. Calculate the volume
March 22, 2012

geometry
a ladder is 53 inches. how tall is it in feet and inches
March 20, 2012

Calculus and vectors
I don't know, I think that it is A-B=C
March 18, 2012

Calculus and vectors
Explain how the vector C⃗(Going from the head of B⃗ to the head of A⃗) can be written in terms of vectors A⃗ and B⃗ Given the shape in this url: imgur dot com/5nT3V
March 18, 2012

Calculus and vectors
Please, help I don't understand vectors T.T 1. In the prism, assume all dimensions have different lengths, state the following: a) state 3 equal vectors to DC⃗ b) state 4 opposite vectors to BC⃗ ------------------------------------- Here is the prism below, ...
March 18, 2012

art history
How would you compare and contrast the northern and southern style temple?
March 15, 2012

Physics
A athlete in good physical condition can land on the ground at a speed of 12m/s without injury , calculate the max height from which the athlete can jump without injury, assuming the takeoff speed is zero
March 12, 2012

Physics
A student throws a baseball vertically upward, and 2.8s later catches it at the same level. Neglecting air resistance , calculate the following (a) the velocity at which the ball left the students hand (b) the height to which the ball climbed above the students hand
March 12, 2012

math
B
March 11, 2012

Physics
A car is doing a loop-the-loop. The loop has a radius of .4m. Assume the car is starting with the minimum speed it needs in order to stay in contact with the track at all times (at the top of the track, the car is not applying a force to the track). neglect friction. What is ...
March 6, 2012

college algebra
A triangle is bounded by the x-and y-axes and must pass through P(2,2) a.) find the area of the triangle as a function of x (Hint: let C be the point (0,2) and D be the point (2,0). Use the fact that ACP and PDB are similar triangles.) b.) What is the domain of the function ...
February 28, 2012

college algebra
A piece of pottery is removed from a kiln and allowed to cool in a controlled environment. The temperature (in degrees Fahrenheit) of the pottery after it is removed from the kiln is shown for various times (in minutes) in the following table. Time(min) Temperature (F) 15 2200...
February 28, 2012

college algebra
A rectangle is bounded by the x-and y- axes and the graph of y = -1/2x + 4. a.) Find the area of the rectangle as a function of x. b.) Complete the following table x area 1 2 4 6 7 c.) What is the domain of this function?
February 28, 2012

college algebra
A magazine company had a profit of $98,000 per year when it had 32,000 subscribers. When it obtained 35,000 subscribers, it had a profit of $117,500. Assume that the profit P is a linear function of the number of subscribers s. a.) Find the function P b.) What will the profit ...
February 28, 2012

college algebra
Thank you and sorry someone impersonated you.
February 28, 2012

college algebra
sorry I will resubmit them. Thanks.
February 28, 2012

college algebra
yes
February 28, 2012

physics
If you were asked to design a capacitor in which small size and large capacitance were required, what factors would be important in your design?
February 27, 2012

physics
A river is moving at 4.0 m/s [s] , and a swimmer swims across it at 1.4 m/s [e] relative to the water. What is the swimmers velocity measure with respect to the river bank
February 26, 2012

physics
A river is moving at 4.0 m/s [s] , and a swimmer swims across it at 1.4 m/s [e] relative to the water. What is the swimmers velocity measure with respect to the river bank
February 26, 2012

college algebra
Given f(x)= 3x^2+x-30 and g(x)=x-3 find f(x)-g(x)
February 24, 2012

college algebra
Find the vertex for f(x)=-5x^2-6x=3
February 23, 2012

economics
An article in Business Week warned of the dangers of deflation as the collapse of numerous Asian economies was creating worries that Asia might try to “ export its way out of trouble” by oversupplying everything from automobiles to semiconductors. Evidence that ...
February 21, 2012

Math
A sensor light installed on the edge of a home can detect motion for a distance of 50ft. in front and with a range of motion of 192degree. Over what area will the sensor detect motion and become illuminated?
February 20, 2012

math
B=1.69 (sqrt (s)+4.45)-3.49 solve for s
February 16, 2012

Math
4t+14=6t/5+7
February 16, 2012

Physics!! Help!!!!!
A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched. Express your ...
February 15, 2012

algrebra
16(5/8x+1/16)x=16(7/16+x) I have no idea how to multiple 5/8 by 16
February 8, 2012

chemistry
who was the first scientist to identify a nuclear bombardment reaction?
February 8, 2012

Physics!! Help!!!!!
. A neutral conducting sphere contains a spherical cavity. A point charge +q is located at the |center of the cavity. A. What is the total surface charge on the interior surface of the conductor? B. What is the total charge on the exterior surface of the conductor?
February 3, 2012

math
the top will have a piece of marble 20 1/2 by 22 bordered by 3 1/4 inches of wood on all four sides. Give the overall dimension of the table top
February 2, 2012

physics
The angle between the polarizer transmission axis and the plane of polarization of the incoming light is 30 +/- 2 deg. If the incident light intensity Io is 100 W/cm2 what would be the intensity I after the light is transmitted through the polarizer? What would be the percent ...
January 27, 2012

Precalculus
Consider the equation 7sin^2x - (4sin2^x)/cosx = -1 a) Put the equation in standard quadratic trig equation form. Why is it 7sin^2x - 8sinx + 1 =0?
January 27, 2012

Precalculus
Which of the following is a solution for the equation 1/485tan^2x = 0? a) pi b) pi/2 c) 485pi d) no solution Which of the following is NOT a solution to the equation 4sin^2x = 1 for 0≤x≤2pi? a) 30 degrees b) 210 degrees c) 150 degrees d) 120 degrees?
January 27, 2012

Precalculus
Solve the equation (x+3)(x-3) = -9. What are the solutions to the equation if you replace x first with sinx and then with cosx, where 0≤x≤2pi?
January 26, 2012

Precalculus
Thank you!
January 26, 2012

Precalculus
Thank you~ May I know how you got 150 degrees? I am so confused when finding the reference angles, whether to subtract or add the degrees.
January 26, 2012

Precalculus
Sorry, I meant 2sinx - cos^2x = sin^2x for 0 ≤ x ≤ 2π 2sinx - cos^2x = sin^2x Do I change the left side to 2sinxcosx - cos^2x = sin^2x
January 26, 2012

Precalculus
Determine the solutions to the equation 2sinx − cos2x = sin2x for 0 ≤ x ≤ 2π . How do I start this question?
January 26, 2012

Math
How can I figure out what the line segment of radical, or Sq root of 17 looks like?
January 18, 2012

Physic
A cheetah can accelerate at a rate of 8.0 M/S^2. Assuming it starts from rest, what will its velocity be after 3.5 SECONDS?
January 14, 2012

math
a certain antibiotic redues the number of bacteria in your body by 10% each dse, if 4 doses of the antibiotic are taken, what percent of the original bacterial population is left
January 3, 2012

math
sam invested $5000 in a GIC earning 8% compound interest per year, the interest gets added to the amount invested, so the next year sam gets the interest on the interest already earned , as well as on te original amoun, how much will sam's investment be worth at the end of...
January 3, 2012

math
a student plants a seed, after the speed sprouts the student monitors the growth of the plant by measuring its height every week, the height after each of the first tree wees was 7mm , 20mm, and 33mm, respectively, if this pattern of growth continuesinwhat week will the plant ...
January 3, 2012

math
determine the 100th term of the arithmetic sequence with t7=465 and t13=219
January 3, 2012

world religions
In class I got this question any help would be great!! I have no clue how to answer it. If Jesus were human, what does this mean for Christianity and Judaism
December 31, 2011

chemistry
10 J
December 30, 2011

science
describe the path that oxygen follows through the human body to reach muscle tissue and describe the path carbon dioxide follows from inside the cell to the outside envrionment
December 29, 2011

science
what 3 anatomical factors influence a persons vo2max and what 3 internal physiological factors influence a persons vo2max
December 29, 2011

math
A catering company has 15 customer orders during its first month, for each month afterward, the comopany has double the number of orders than the previous month. How many orders in total did the company fill at the end of its first year ?
December 17, 2011

math
a ball is dropped from a height of 3m and bounces on the ground . At the top of each bounce, the ball eaches 60% of its previous height. Calculate the total distance travelled by the ball when it hits the ground for the fifth time
December 17, 2011

Math
The 13th termof an arithmetic sequence is 61 and the 20th term of the squence is 82. Calculate the sum of the first 25 terms of the sequence
December 17, 2011

Math
the 12th term in a geometric sequence is 49, and the 14th term is 2401 . Find the 15th term
December 17, 2011

algebra
The first 1/5 of a mile is $1.50. For every additional 1/5 of a mile is 25 cents. If Marc has $3.75, at least how far can he go? P.S. I need an inequality.
December 14, 2011

physics 2B
This ties in with chemistry actually. They give you Temperature, Pressure, and Volume. Convert temperature to Kelvins (add 273) and convert your volume to Liters. Use R constant 0.0821. Plug into the ideal gas law of PV=nRT and solve for the moles of the He atom (thats n). ...
December 10, 2011

Chemistry
Thanks so much! That makes alot more sense now. The figures really helped out.
December 10, 2011

Chemistry
Not to mention the conversions! But thanks a million. :) I got a range of an average of 0.064 nm to 0.45 nm. Considering concept wise though, do the units of nm make sense for an atoms diameter? Thats not visible right?
December 10, 2011

Chemistry
True or False: The diameter of most atoms will be between 0.05 nm and 0.3 nm. I think its false (I don't think there even is an average diameter for atoms...), but I can't find any reliable sources to back up my hunch. Help please...
December 10, 2011

math
Matthew is riding a ferris wheel at a constant speed of 10km/h. The boarding height for the wheel is 1m, and the wheel has a radius of 7m. What is the equation for the function that describes Matthews height in the terms of time, assuming Matthew starts at the highest point on...
December 8, 2011

Math
The diameter of a car's tire is 60cm . While the car is being driven , the tire picks up a nail .How high above the ground is the nail after the car has travelled 1km
December 8, 2011

Biology
explain the process of adaptive radiation, and how are reproductive barriers important to speciation
December 8, 2011

World religions
For this project for school we have to represent the noble eightfold path ( right view) to canadian society , but i am so stuck , i dont really know anything that would make sense, any help would be great
December 3, 2011

chemistry
Calculate the pH of each of the following solutions. (a) 0.300 M propanoic acid (HC3H5O2, Ka = 1.3 10-5) (b) 0.300 M sodium propanoate (NaC3H5O2) (c) pure H2O (d) 0.300 M HC3H5O2 and 0.300 M NaC3H5O2
December 2, 2011

chemistry
The Ksp for silver sulfate (Ag2SO4) is 1.2 10-5. Calculate the solubility of silver sulfate in each of the following. A)water B)0.14 M AgNO3 C)0.33 M K2SO4 the answer in mol/L
December 2, 2011

math
how do u do lost digits?? my son has to do this for homework and we are both stuck on how to do this.
November 30, 2011

Statistics
The average hourly wage of employees in a large nationwide industry is $12.96. Assume the variable is normally distributed, with a standard deviation of $4.46. In a randomly selected sample of 10,000 such employees, how many of them (correct to the nearest hundred) would you ...
November 28, 2011

statistics
570 people were in a survey and 124 people said yes. What proportion of people said yes to 1 d.p
November 24, 2011

chemistry
Calculate the pH of a 0.063 M (C2H5)2NH solution (Kb = 1.3 10-3).
November 24, 2011

Chemistry
Calculate the molar heat of neutralization in kJ/mol of the reaction between HA and BOH given the following information: The temperature change equals 8C, 50 mL of 1 M concentration of Acid 50 mL of 1 M concentration of Base Heat capacity of the calorimeter is 6.5 J/C. ...
November 20, 2011

math
prove these identies sin^2+tan^2=sec^2-cos^2 sin^2 sec^2 +sin^2=tan^2+sin^2
November 18, 2011

math
An urn contains 5 red marbles, 4 blue marbles, and 3 green marbles. A marble is selected at random and then, without replacing the first marble, a second marble is selected at random. What is the probability of selecting a green marble and then a red marble?
November 16, 2011

English
What are the differences between the characters Johnny and dally, in the story The Outsiders by S.E. Hinton?
November 14, 2011

english
what does this mean? how can i summarize it ?? "we acquire language not just because we are taught it, but because we are born with the principles of language. They're in our genes. We have language because of nature, not just nurture"
November 14, 2011

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