Total # Posts: 3,087
Science Check answers
2) What phenomenon naturally warms Earth's lower atmosphere and surface? the formation of sunspots changes in the shape of Earth's orbit global warming (MY ANSWER) the greenhouse effect 3) Which of the following is an example of human impact...
April 29, 2016
Use PV=nRT to find n, the moles of hydrogen gas. V= 1.68x10^-2 L P= 715 torr-VP of water at 25C (about 25 torr; look it up in Wikipedia) T= 298.2K R = Applicable value for the above units.
April 27, 2016
I'm having difficulty understanding density. I am trying to relate the concept of density to brownies. Should a brownie with baking soda have a higher or lower density compared to a brownie with no baking soda? Does a thick brownie mean a high or low density? When it says ...
April 24, 2016
A military gun is mounted on a railroad car (m = 1500 kg). There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 30 kg with a velocity of 300 m/s at an angle of 40° with respect to the ...
April 23, 2016
two particles of mass m1=1.5 kg, and m2=3.5 kg undergo a 1-dimensional head-on collision. Their velocities along x are V1i=12 m/s, and V2i=-7.5 m/s. The 2 particles stick together after the collision. a.) Find the velocity after the collision. b.) How much kinetic energy is ...
April 23, 2016
A skier of mass 110 kg travels down a frictionless ski trial. a.) If the top of the trail is a height 200m above the bottom, what is the work done by gravity on the skier? b.) Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts form ...
April 22, 2016
John can paint a room in 3 hours. His apprentice, working alone, requires 6 hours to do the same job. How long would it take John and his apprentice, working together, to paint the room if they continue to work at the given rates?
April 14, 2016
Squids and octopuses propel themselves by expelling water. They do this by taking the water into a cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees ...
April 11, 2016
A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm . For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F? I keep doing this but I do not think ...
April 11, 2016
Anna is designing rectangular garden that has an area of 182 square feet, and the length is longer than the width. The table lists the possible whole number dimensiones for the garden. Which dimensiones are missing?
April 4, 2016
A segment with endpoints (3, -2) and (4, 2) is dilated to the image segment with endpoints (9, -6) and (12, 6). What is the scale factor for the dilation? 3 2 6 **my choice 9 **i feel its this one too, im stuck
March 31, 2016
Why does the Rabbi's son abandon his father on the march to Buchenwald? He believes his father is better off without him. He wants to be free from the responsibility of his father. He doesn't want to tell his father he doesn't believe in God. <~my choice He ...
March 29, 2016
The length of a rectangular piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel is 56 meters. Find the length of the piece of steel. Find the width of the piece of steel.
March 22, 2016
two cruise ships sail from NY to FL.ONE ship make the round trip in 8 days.the other ship make the round trip in 10 days.both ships sail from ny today.which is the fewest number of days before both ships will sail again from newyork on the same day?
March 19, 2016
Aj bought a portable game system on sale for $150.the portable game system was 70% of the regular price.aj concluded that the original price of the portable game system must have been $225. Aj correct? justify your answers part b is 70% of an original price the same 30% of an ...
March 19, 2016
A rectangular lap pool has a constant depth. The length of the pool is 9 times the width, and the surface area of the water is 81 square feet. What are the dimensions of the pool? Include units.
March 17, 2016
magine you work in a steel mill in a large industrial city in England in the late 1800s. You live in a neighborhood with other factory workers, and share the same living and working conditions they do. Write a letter to your representative in Parliament expressing your ...
March 16, 2016
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 15, 2016
A triangular pyramid is defined by the points .The pyramid is then reflected over the xz-plane. The reflected image is then translated 3 units back, 2 units left, and 4 units up. Write the general rule you use for the reflection. Show the results of your calculations for the ...
March 11, 2016
Toronto is playing Anaheim in the Stanley cup final. The first team to win four games is the new NHL champion. If the probability of that Toronto will win any game is 0.55 determine the probability that Anaheim wins the Stanley Cup.
March 7, 2016
You have 775 mL of an 0.11 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.05? (The pKa of acetic acid is 4.76.) I don't know what to do!!! HELP!!!!
February 28, 2016
What does the radius of a sphere join? any two points on the sphere and does not contain the center any two points on the sphere and contains the center <~my choice any two points on the sphere the center and a point on the sphere
February 25, 2016
What does the diameter of a sphere join? any two points on the sphere any two points on the sphere and contains the center <~my choice any two points on the sphere and does not contain the center the center and a point on the sphere
February 24, 2016
THis is the question posed to me by mi bio teacher. THe more specific of it it is, "find the masss of a liver cell, assuming it has the shape of a cube, with the diameter and density of water."
February 23, 2016
What did John Locke believe? Absolute monarchs have the right to rule through divine right. God should not be involved in the affairs of mankind. All governments should have three branches with equal power. <~my choice It is the governments job to protect the natural rights...
February 19, 2016
2. In the space below, create a simple time line that traces the emergence of a constitutional monarchy in England during the seventeenth century. It is not necessary to include exact dates, but events should be in the correct order. Include at least eight events that were ...
February 12, 2016
1. Explain from the Gilded Age that supports the "the farmers were up in arms." 2. What is one change in the South between 1877 and 1900 that reflected the policies of the New South agenda?
February 4, 2016
I got it it was 2.1 x .5 then i calculated it now I am trying to figure out What the car's displacement is from its original position? how would I figure that out do I divide from the 2.1 and the 1.05?
January 31, 2016
A circular test track for cars has a circumference of 2.1 km . A car travels around the track from the southernmost point to the northernmost point what distance does the car travel?
January 31, 2016
A certain amount of calcium reacts with water and the formed hydroxide 49g completely neutralized phosphoric acid. Calculate the volume of hydrogen obtained, at STP, and the mass of calcium.
January 22, 2016
The length of an aluminium bar of length 80 cm increases by 1 mm on heating.What is the final temperature of the bar if it was initially at temperature 20 degree Celsius? (coefficient of linear expansion of aluminium =25*10-6/degree Celsius)
January 22, 2016
the length of an aluminium bar of length 80 cm increases by 1 mm on heating. What is the final temperature of the bar if it was initially at temperature 20 degree celsius? coefficient of linear expansion of aluminium =25*10-6/ degree celsius
January 22, 2016
Can someone please check my answers for finding the subject and verb these sentences? The milk in the back of the refrigerator is probably spoiled by now. S= milk V= is spoiled The family that lives in the brown house moved in just a month ago. S= family V= moved Jackie, Gwen...
January 21, 2016
Physics with Calculus
qsub1:-2.8uC qsub2: 6.6uC qsub2 sits 7.9 cm away from qsub2, and in a previous question moved up the y axis 2.7cm. The question that I am having difficulty with has added qsub3 in the middle of of qsub1 and qsub2, changing the magnitude of Fsub2net= 7.954. What is the sign and...
January 9, 2016
Car 1 & Car 2 leave the same location . Car 1 leaves the location 10 minutes before Car 2 and is traveling 65 mph. Car 2 is traveling at 75 mph. How long before Car 2 catches Car 1?
December 31, 2015
A plane leaves an airport and flies at 36 mph on a course of 103.25° for 1 hour and 33 minutes. Then it changes course to 236.75° and flies for 48 minutes. How far is it from the airport? If it wished to return, what would be its course?
December 16, 2015
An experiment is underway to test effect of extreme temperature on a newly developed liquid two hours into the experiment the temperature of the liquid is measured to be-17 degrees Celsius after eight hours of the experiment the temperature of the liquid is -47 degrees Celsius...
December 11, 2015
Martin Luther King begins his letter with the following paragraph: While confined here in the Birmingham City Jail, I came across your recent statement calling our present activities "unwise and untimely." Seldom, if ever, do I pause to answer criticism of my work ...
December 4, 2015
a customer went to a garden shop and bought some potting soil for 17.50 and shrubs. if the total bill was $71.00, how much did each shurb cost if they all cost the same? write and solve an equation. show your work
November 23, 2015
Suppose you have $60 to buy shrimp and chicken wings for a party. Shrimp costs $10/lb and wings cost $6/lb. Write and graph a linear equation that could be used to determine the number of pounds of each food that can be purchased with $60 Would I start with the y = mx + b 60...
November 5, 2015
A utility company has the following rate schedule for natural gas usage in a city's business district: Monthly service charge $8.80 per therm service charge: 1st 25 therms: $0.6686/therm over 25 therms: $0.85870/therm (a) what is the charge for using 25 therms in one month...
October 30, 2015