Sunday
December 21, 2014

Posts by John


Total # Posts: 6,393

Physics
An air track glider, 8.0 cm long, blocks light as it goes through a photocell gate. The glider is released from rest on a frictionless inclined track and the gate is positioned so that the glider has traveled 96 cm when it is in the middle of the gate. The timer gives a ...
September 22, 2011

Physics
In a movie, a stuntman places himself on the front of a truck as the truck accelerates. The co efficient of friction between the stuntman and the truck is 0.65. The stuntman is not standing on anything but can “stick” to the front of the truck as long as the truck ...
September 22, 2011

physics
i think its 5 x 4.5 plus the initial 5 m= total displacement
September 22, 2011

math
math problem: a snake is 60 inches long. It grows 3 inches every year. How long will it be y years from now?
September 21, 2011

physics
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 21, 2011

Physics
An air track glider, 8.0 cm long, blocks light as it goes through a photocell gate. The glider is released from rest on a frictionless inclined track and the gate is positioned so that the glider has travelled 96 cm when it is in the middle of the gate. The timer gives a ...
September 21, 2011

Science
Can someone please help me please thank you. Climate change is an environmental issue in the news almost daily, and air pollution impacts us on a global level. What are the implications of global warming? Do you think the efforts to improve air quality are worth the economic ...
September 20, 2011

MATH
IN MY KIDS HOMEWORK THE NUMBER 3 IS TO THE LEFT AND IT ASKS TO PLACE COUNTERS IN THE FIVE FRAME TO SHOW THE NUMBER. WHAT IS A COUNTER?
September 19, 2011

Physical Science
Can you please go over my answers to see if Im correct Im having trouble in this class. A car with mass 2000kg is held at a height of 1.8 meters by a hydraulic lift. The surface area of the piston inside the lift is 300cm², and the surface area of the input tube at the ...
September 18, 2011

Physics HELP
A hot air balloon is 2.5m above the ground rising at 2m/s. A camera is thrown from the ground at 13m/s. At what height do the camer and balloon meet. Need to know the correct formulas and how to insert the data. Stuck on this question for homework.
September 18, 2011

physics
a hot air ballon is 2.5m high, moving at 2/ms. when someone throws a camera at 13m/s to the baloon. at which height do they meet?
September 18, 2011

Physics
4.79 m/s/s
September 18, 2011

Chemistry
The following are the optical properties of three materials A,B and C. Property A B C reflectivity 0.85 0.15 0.001 Absorptivity 0.1 0.7 0.1 a) Determine the transmissivity of the materials b) which material heats up fastest when illuminated? c) which one will be the most ...
September 18, 2011

Physics
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 17, 2011

Math
A company reaches the break - even point when its total revenue equals its total cost. The company sells their product at $ 25 per unit. If their total cost is $ 3,000 plus a unit cost of $ 12 , does the company break - even when 200 units are sold? (a) Yes (b) No
September 15, 2011

Math
A total of $ 15,500 is to be divided between Deedy and Maria. If Deedy is to receive $ 3,000 more than Maria, how much will Maria receive? (a) $ 9,000 (b) $ 6,250 (c) $ 6,000 (d) $ 5,000 (e) $ 10,500
September 15, 2011

math 3b
In a set of 400 values, the mean is 121 and the standard deviation is 14. Estimate how many values fall in betweeb each interval
September 15, 2011

Animal Physiology-Membrane Potential
For #1, I got E(K+) = 60/+1 * log (5mM/140mM) = -87mV I think this is right but I don't the rest
September 15, 2011

Animal Physiology-Membrane Potential
Intracellular Extracellular Na+ 12 mM 160 mM Cl- 7 mM 110 mM K+ 140 mM 5 mM 1.How do you calculate the equilibrium potential for potassium, K+, under these conditions? 2. Assuming that Na+ is the only ion the plasma membrane of this cell is permeable to, at what voltage will ...
September 15, 2011

Vocabulary/social studies
Whats the latin base in the woed aggrandize?
September 15, 2011

Physics
Im having trouble understanding the concept of pressure. Help please! What is the pressure at the bottom of a tube of mercury that is 0.2 m deep? An elephant with a mass of 1000 kg stands on a circus platform that weighs 50 kg. The area of the bottom of the platform is 1.25 m&...
September 15, 2011

Physics
Im having trouble understanding the concept of pressure. Help please! What is the pressure at the bottom of a tube of mercury that is 0.2 m deep? An elephant with a mass of 1000 kg stands on a circus platform that weighs 50 kg. The area of the bottom of the platform is 1.25 m&...
September 15, 2011

math
A book club offer was mailed to a sample of 400 famles. Of these, 80 families ordered books. Next month, the book club offer will be mailed to 20,000 families. What is the predicted number of orders expected from the mailing next month?
September 14, 2011

math
Ned is one of 6 library volunteers. He is also one of 8 playground volunteers. Each week 1 volunteer from each group is randomly chosen from each group to work. (Park A) What is the probability that Ned will be chosen for both groups in the same week? (Park B) Are these events...
September 14, 2011

math
Phyllis made some sandwiches for a family reunion.She made 12 turkey sandwiches, 10 ham sandwiches, and 8 cheese sandwiches . She wrapped the sandwiches in paper but forgot to label them. (Part A) The first person took 2 candwiches what is the probability that the first ...
September 14, 2011

math
eva has 4 quarters, 5 dimes, and 6 nickels in her pocket. She takes out 2 coins without looking. What is the probability that eva picked a dime followed by a quarter?
September 14, 2011

math
What is 7 16/20 + 6 1/20?
September 14, 2011

Science
Can someone please help me with the question below thank you. What do you think is the most viable way to address after effects of the possible peak?
September 14, 2011

physics
Find the electric flux through each surface. (Use any variable or symbol stated above along with the following as necessary: ε0.)
September 14, 2011

physics....answer this!
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 14, 2011

math
In 1968, the estimated population of the world was 3,559,028,982 people. When this number is written in expanded form using exponents, one power of 10 would not be represented. Which power of 10? Why?
September 13, 2011

math
Polynomials: -5a3power (4a4power – 3a + 1)
September 13, 2011

college algebra
The goal of this problem is to solve the equation by completing the square. x^2-9x+14=0
September 13, 2011

Math Algebra 2
m1v1 + m2v2=(m1+m2)v3 find m1 If you could please explain it too or show the steps I would appreciate it.
September 13, 2011

college algebra
Perform the indicated operation(s) and express the result in standard form. Leave answers in terms of square roots (do not use decimals). (-9-sqrt-3)^2
September 13, 2011

college algebra
Find the product and enter the real and imaginary parts below. Note that you do not need to type in the since it is already given to you. Simplify your square roots as much as possible. sqrt-27((sqrt-5)-(sqrt-11))
September 13, 2011

math
Find the product and enter the real and imaginary parts below. Note that you do not need to type in the since it is already given to you. Simplify your square roots as much as possible. sqrt-27((sqrt-5)-(sqrt-11))
September 13, 2011

math
Perform the indicated operation(s) and express the result in standard form. Leave answers in terms of square roots (do not use decimals). (-9-sqrt-3)^2
September 13, 2011

Physics
A rocket is launched from rest. After 8.0 min, it is 160 Km above the Earth’s surface and is moving at a speed of 7.6 Km/s. Assuming the rocket moves up in a straight line, what are its (a) average velocity and (b) average acceleration?
September 13, 2011

Physics
A. A small plane departs from point A heading for an airport at point B 480 km due north. The airspeed of the plane is 200 km/h and there is a steady wind of 50 km/h blowing northwest to southeast. Determine the proper heading for the plane. B. How long will the trip take?
September 12, 2011

physics
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 12, 2011

Science
what would tides be like if the moon did not exist? a) There would be no tides without the moon's gravity. b) There would be one high tide and one low tide every 24 hours because of the sun's gravity, with the high tide at noon and the low tide at midnight. c) There ...
September 11, 2011

Science
Why doesn't the space station fall toward the earth, instead of remaining in space? a) It is beyond the earth's gravitational pull. B) The earth's gravity is balanced out by the attraction of the sun and other planets. C) Centrifugal force keeps it up. D) It does ...
September 11, 2011

physics
Bob jumps into a pool, after he stops moving and becomes stationary i the water. What happens to his k energy?
September 11, 2011

Physics
0.3857142857
September 11, 2011

physics
Bob jumps into a pool, after he stops moving and becomes stationary i the water. What happens to his k energy?
September 11, 2011

Physical Science
The diving board is 3m above the floor thats all the information i was given
September 11, 2011

Science
Please help Thank you. 1. What will the impact be like for Humanity’s natural resource base and thus economic security if everyone enjoyed the same lifestyle?
September 11, 2011

Science
Can someone please help me with these questions below thank you. 1. What do you think the impact of the earth's climate will be like if everyone enjoyed the same lifestyle? 2. What will it be like for The health of ecosystems and biodiversity? 3. What will the impact be ...
September 10, 2011

Physics
use the face that the speed of light in a vacuum is about 3.00 x10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours
September 8, 2011

physics
that's what i did but the computer is telling me it's wrong
September 7, 2011

physics
A flowerpot falls from a window sill 37.6 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2. Answer in units of m/s Please show me the formula and steps i would use to solve this, Thanks!
September 7, 2011

College Calculus
The graph A(x) has points (-3,0), (0,-2), (1,0) and (2,3). If C(x) is defined by C(x)=A(2x+3), then what is the domain and range of C and how would the graph of C(x) look like? Also, is there any way to find what the actual equation of A(x) is with the points listed above? ...
September 7, 2011

physics
few
September 7, 2011

Calculus
find the limit of ((sqrt(x+4))-2)/x as x approaches 0.
September 6, 2011

physics
A driver of a car traveling at 16.7 m/s applies the brakes, causing a uniform deceleration of 2.5 m/s2. The first question is - How long does it take the car to accelerate to a final speed of 13.9 m/s? For this i got 1.12 and that's correct. The second question is - How ...
September 6, 2011

Math
The Transitive Property states that if a = b and b = c , then a = c. Explain how you can use the Transitive Property to show that the expressions 0+x+13 and 13+x are equivalent.
September 6, 2011

Calculus
The graph A(x) has points (-3,0), (0,-2), (1,0) and (2,3). If C(x) is defined by C(x)=A(2x+3), then what is the domain and range of C and how would the graph of C(x) look like? Also, is there any way to find what the actual equation of A(x) is with the points listed above? ...
September 6, 2011

physics
A toboggan is sliding down a snowy slope. The table shows the speed of the toboggan at various times during its trip. (a) Make a graph of the speed as a function of time. (b) Judging by the graph, is it plausible that the toboggan’s acceleration is constant? If so, what ...
September 6, 2011

Physics
A drag racer crosses the finish line of a 400.0-m track with a final speed of 104 m/s. (a) Assuming constant acceleration during the race, find the racer’s time and the minimum co efficient of static friction between the tires and the road. (b) If, because of bad tires or...
September 6, 2011

physics
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 6, 2011

algebra
solve the elimination method 7r-3s=0 3r+7s=58 what is the solution of the system
September 6, 2011

Challenger institution of technology
An airplane of mass 2800 Kg has just lifted off the runway. It is gaining altitude at a constant 2.3 M/s while the horizontal component of its velocity is increasing at a rate of 0.86 M/s2. Assume g= 9.81 M/s2. (a) Find the direction of the force exerted on the airplane by the...
September 5, 2011

physics
A rocket burnt fuel av the rate of 20kgs^4 and eject it with a velocity of 5.0*10^3ms^-1. Calculate the thrust exerted by the gas on the rocket.
August 31, 2011

chemistry
Can you explain the electron configuration for the transition metal ions?
August 30, 2011

chemistry
The first five successive ionisation energies of an element are 0.807, 2.433, 3.666, 25.033, 32.834 MJ mol–1 . Which one element from those listed below could this element be? (A) B (B) C (C) N (D) O (E) F
August 30, 2011

Science
Can someone please help me with these questions below. Extinction is a natural selection process. Should humans strive to preserve a representative sample of all biomes or aquatic zones? Why should humans be concerned with the extinction rate?
August 30, 2011

chemistry
what is the mass of 20mL of a solution that has a specific gravity of 1.69
August 30, 2011

Writing
Im wondering about citing a book in a paragraph basically would i just put Last name, Firstt name. title. edition. city: publisher, year.? Do I also need to include like what page numbers I exactly took it from and do i just throw this at the end of the essay by that i just ...
August 30, 2011

Physics
I don't understand any thing about the centripital force and torque please HELP me to solve problems about this topics.
August 29, 2011

Physics
I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,
August 29, 2011

Physics
I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,
August 29, 2011

Physics
I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,
August 29, 2011

physics
a)s=vt so t=s/v t=18.3m/12.2ms=1.5s the same is for the other so t1=1.5s & t2=1.5s so t1-t2= 1.5s-1.5s=0
August 29, 2011

Math
For the question below can you please help explain why this survey question might lead to an erroneous conclusion thank you. SURVEY QUESTION: “Do you think that it is not important to give extra tutoring to students who are not failing?
August 27, 2011

Math
“Vitamin E is a proven antioxidant and may help in fighting cancer and heart disease.” Is there anything ambiguous about this claim? Can someone please help and give me a detailed answer for this problem Thank you.
August 27, 2011

Calculus
jk jk. dont quit
August 27, 2011

Calculus
you must be pretty damn stupid amanda. is suggest you quit school
August 27, 2011

Statistics
Transactional data can be used to partition a customer base into different ‘segments’ based on predominant purchasing patterns. Typical segments might be ‘convenience shoppers’ (customers who buy a lot of ready meals, pizzas, etc.), ‘cooking from ...
August 26, 2011

math
use the numbers 3,5,6,2,54, and 5 in that order to write an expression that has a value of 100
August 24, 2011

6th grade math
125
August 24, 2011

physics
A school bus takes 0.55 h to reach the school from your house. If the average velocity of the bus is 17.1 km/h to the east, what is the displacement?
August 23, 2011

Calculus
A manufacturer determines that the profit derived from selling x units of a certain item is given by: P = − 2x^2 +800x Find the marginal profit for a production of 20 units. Also, The demand function for a particular commodity is given by: p = 400− 4x . Find the ...
August 23, 2011

6th gr,ade math
5/20
August 22, 2011

MATH
Can anyone please help me with this? Can anyone please build or generate at least five Pythagorean Triples using one of the many formulas available online. Then After building the triples, verify each of them in the Pythagorean Theorem equation. Thank you so very much.
August 19, 2011

math
Give a number to the thousandths place that is greater than 7.2 but less than 7.3.
August 15, 2011

math
Give a number to the thousandths place that is greater than 7.2 but less than 7.3.
August 15, 2011

Chem 121
how do I calculate error analysis on my tritation expirement?
August 15, 2011

Math
Can you please help me select at least five numbers; 0 (zero), two even, and two odd numbers and do a simple substitution of number for variable in a formula. And can you explain each step and show the work on how you came up with the answer please thank you.
August 14, 2011

Physics 1 (college)
I dont understand where you got .1 and then -1 from. Can you explain that?
August 8, 2011

Math
Can you please explain step by step on how to do each of these two problems below? And then tell me whether it involves an arithmetic sequence or a geometric sequence I also need the work shown out for both problems thank you. 1). A person hired a firm to build a CB radio ...
August 7, 2011

Math
Can you please explain step by step on how to do each of these two problems below? And then tell me whether it involves an arithmetic sequence or a geometric sequence I also need to show the work on both problems thank you. Perform the indicated operations 1010 two × 101...
August 7, 2011

Math
Can you please explain step by step on how to do each of these two problems below? And then tell me whether it involves an arithmetic sequence or a geometric sequence I also need the work shown out on both problems thank you. Perform the indicated operations and reduce the ...
August 7, 2011

math.
If x>0 and x=5y, then square root of x^2-2xy+y^2 is..
August 2, 2011

statistics
Would it be unusual for the mean of a sample of 3 to be 115 or more?
August 2, 2011

verbs
What's your question..
August 2, 2011

math
if f(x)= 5x+7 and g(x)=x^2-2 write the functions a. (fxg)(x) b. f(g(x))
August 1, 2011

calculus
For any divergence especially with trig definitions in infinite series you will want to make sure that you can prove it to something. Comparison test or limit comparison works really well just remember that the sine function is only good from -1 to 1
August 1, 2011

history
What problems had to be overcome Africa's interior could be opened up to Westeren explorers? what helped to over come these problems?
July 30, 2011

chem
if the saturation of carbon is 12 and nitrogen is 6 what is the tempature of 200ml in 450 g containers in parts per million
July 29, 2011

Pages: <<Prev | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | Next>>

Search
Members