1. A plane accelerated from a speed of 2.0 m/s at the rate of 3.0 m/s2 over a distance of 530 m. What is its speed after traveling this distance? 2. A jet plane must achieve a velocity of 71 m/s for takeoff. From rest and with a 1,000 m long runway, what must the acceleration ...
November 3, 2011
At an accident scene, 276-m long skid marks are found on the road. If the car that made these skid marks can decelerate at 9.8 m/s2, how fast was the car going before braking?
November 3, 2011
A person with a mass of 77.5 kilograms is pushed on a sled across the frictionless surface of a frozen pond with a constant horizontal force of 14.8 Newtons. What is their acceleration?
October 12, 2011
The force of gravity between two people is 4.9 x 10-13 Newtons. Person 1 has a mass of 61.3 kilograms, and person 2 has a mass of 93.5 kilograms. The value of G is 6.67 x 10-11 m3/s2 kg. How far apart are they from each other?
October 12, 2011
a dike in Holland springs a leak through a hole of area 1cm squared at a depth of 2m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? can he do it?
October 12, 2011
You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of -55.0 units. What are the two possibilites for its x component? Please explain, thanks! :)
September 20, 2011
using the kinematic equation: displacement=initial velocity*time+ .5(acceleration*time^2) delta x= 0*7.8+.5(2.3*7.8^2) delta x= .5(2.3*7.8^2) delta x= .5(2.3*60.84) delta x= 69.966 m with sig figs your answer would be 70 m hope this helps!
September 20, 2011
consider a football team whom the numbers on active players' jersey are 29,41, 50, 58, 79,..., 10 (listed in alphabetical order of the players' names) Does it make sense to calculate the mean of those numbers? why or why not?
September 10, 2011
Since Jessicas participation in local politics increased significantly after she joined her schools political science club, it is clear that her involvement in that club led her to take an interest in politics. The argument above is flawed because
August 9, 2011
The standard deviation of given population is 4.5 with a mean of 60 and the refit population has a standard deviation of 5.2 with a mean of 75. Calculate the coefficient of variation for both populations and comment on the results.
July 22, 2011
The following logistic function describes the percent of the population of a city that will purchase the local newspaper. P(t)=(65)/(1+34e^(-0.223 t)) "t" is the number of days since the newspaper is first launched. When will the newspaper reach 60% of the population
June 13, 2011
IT Fundmentals of Programming w/ Algoriths & Logic
How would I write an object-oriented pseudocode for a system that allows a user to enter their name into a text box? When they press the Go button a message will be displayed in a label that says Hello and their name.
June 11, 2011
Math please help please help
Out of 42 kids in a class twice as many failed Ela as math,4 failed both. If 7 failed neither, find how many failed each subject. Please help and show work it would be great thanks i really need help thanks
June 6, 2011
During the first part of a trip, a canoeist travels 33 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip? The speed on the first ...
April 21, 2011
Describe the difference between word-level skill and text-level skill attainment for ELL students. Then, describe specific things teachers can do to increase ELL students' text-level skills.
April 4, 2011
help me translate please!! i tried it myself but it was a mess! :( My name is Isabella and I am 14 years old. I live with my parents and two brothers in the outskirts of Newport. My school is a few miles away from where I live, I go to school by coach but I used to go to ...
March 12, 2011
I find these questions so difficult! I've been trying to solve them but I just can't. As they are diagrams they are hard to express in words, so the questions are the links below: 1) tinypic(.)com/r/25z7486/7 2) tinypic(.)com/r/4uhrg3/7 3) tinypic(.)com/r/juu9zs/7 (...
March 8, 2011
A 200-g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.00 J, find (a) The force constant of the spring and (b) The amplitude of the motion.
February 17, 2011
Run the simulation using n = 30 and N = 10 for a uniform, a bell-shaped, and a skewed distribution. § Identify the mean of the sampling distribution of sample means for each distribution. § Evaluate if the results are what you expected for each distribution. Run the ...
January 28, 2011
Consider two vectors where F1 = 38 N, F2 = 58 N, and = 240o and = 25o, measured from the positive x-axis with counter-clockwise being positive. What is the magnitude of the equilibriant?
December 5, 2010
I need to write the specified ratin as a simplified fraction. A certai lake is 1100 ft deep. A nearby lake is 300 feet deep. Write the ratio of te fist lake's depth to the second lake's depth.
November 17, 2010
The scores on a test are normally distributed with a mean of 140 and a standard deviation of 28, what is the score that is one standard deviation above the mean?
November 14, 2010
Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.
November 4, 2010
If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?
September 28, 2010
a pendulum of the length L is suspended from the ceiling of an elevator. When the elevator is at rest , the period of the pendulum is T. In instant when the pendulum reaches its highest position the elevator starts the free fall. What is the period of the pendulum if the ...
September 21, 2010
Soccer player #1 is 8.6 m from the goal. If she kicks the ball directly into the net, the ball has a displacement labeled A. If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball under goes two successive displacements, Ay and Ax. ...
August 25, 2010
The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is 85.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of 35.0 ...
August 25, 2010
1)What theory does the narrator propose in the first paragraph of The Mark of the Beast? A) In Asia, Asian gods rather than the Christian God control most events. B) The British Empire is doomed because it disregards the values and traditions of native peoples. C) ...
July 21, 2010
I am having an issue solving this appendix.... Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to ...
July 15, 2010
2.A ball rolls off a shelf with a horizontal velocity of v. At what horizontal distance from the shelf does the ball land if the height of the shelf is h above the floor? 3. A car travels around a circle with a diameter of 500 m at a constant speed of 25 m/s. The static ...
May 24, 2010
4. Two masses of 3 kg and 5 kg collide head-on, the former moving to the right with the speed 5 m/s and the latter moving to the left with the speed 3 m/s.After collision they stick together. What amount of mechanical energy is lost? 5. A cylinder with a uniform density is ...
May 24, 2010
At Shannons birthday Kira ate 3 pieces, Brazdley ate 2,Shauna ate 4, and Sammi ate 3 pieces of pizza. Now 1/4 of the pizza is left. How many pieces was the pizza originally cut into?
April 19, 2010
a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation
April 11, 2010
I need to write this parabola question 2(x+3)^2 -1 in general form. Not sure how to do it. Do I sqaure whats in brackets first? x^2 + 6x +9 then *by 2 so 2x +12x +18 - 1 = 0 Would this be the answer or am I doing it wrong? Any help appreciated.
March 16, 2010
If cos^2 theta -6 sin 2 theta =0, one value of theta is a)0 degrees b) 90 degrees c)180 degrees or D)255 degrees. Please show me how to do it and not just give answer cause I have two more questions that are similar. Thanks so much.
March 10, 2010
If the radiation of an automobile contains 12L of water, how much would the freezing point be lowered by addition of 5 kg of prestone (glycol, C2H4(OH2))? How many kg of zerone (methyl alcohol, CH3OH) would be required to produce the same result? assume 100% purity .
March 6, 2010
What is a possible explanation for the significance of two separate flood myths in which the water comes from the sky (Guatemalan mythology) and in the other, the water comes from the ground (African mythology)?
December 14, 2009
The ceiling of a single-family dwelling in a cold climate should have an R-value of 25. To give such insulation, how thick would a layer have to be if it were made of each of the following materials? (a) polyurethane foam (thermal conductivity k = 0.024 W/m · K)
November 23, 2009