Wednesday
March 22, 2017

Posts by eduardo

Total # Posts: 60

Physics
You decide to repeat Archimedes experiment and determine the density of a candle holder. you suspend it from a spring scale and scale reads 8.0N. You then lower the holder into a tub of water until completely submerged and it reads 5.0N. what is the volume and density of the ...
February 7, 2017

MATH FOR LIBERAL ARTS
Estelle is 5.9 feet tall. Find her height in centimeters to the nearest to the nearest tenth.
December 14, 2016

MATH FOR LIBERAL ARTS
Estelle is 5.9 feet tall. Find her height in centimeters to the nearest tenth.
December 14, 2016

Physics
The size of Rutherford's atom is about 0.1 nm. (a) Calculate the speed of an electron that moves around a proton, based on their electrostatic attraction, if they are separated by 0.1 nm. (answer in m/s) (b) Calculate the corresponding de Broglie wavelength for Rutherford...
March 13, 2016

Physics
How much energy is required to ionize hydrogen when it is in the state with n = 6? (answer in eV)
March 13, 2016

physics
1. The position of a particle is given by x= At2 + Beαt, the particle is initially at x = -2.0m with v = 4.0 m/s at t = 0s. After 0.2 s, the velocity is observed to be 5 m/s. What is the acceleration after 1.0s?
February 16, 2016

math
Mike has 3 planting boxes for her flowers . each boxes is 4 feet wide and 8a feet long how much area for planting flowers does mike have altogether ?
January 14, 2016

Chemistry
It is common in this experiment for students to calculate percent yields for the reaction that are above 100%. Is this result a violation of the law of conservation of matter? I need help writing an essay based on this prompt.
November 8, 2015

Math
I need 30 desks in a classroom I have 4 rows with 5 chairs in each how many more do I need
October 6, 2015

The area, A cm3 , of a circle increases at a constant rate of 2 cm2 ´ s -1 . If the initial area of A is 1 cm2 , show that the radius of the circle at time t is given by r=sqrt( 2t+1/ pi) sqrt on both denominator and numerator
August 30, 2015

Math
250 in3 2,500 in3 6,250 in3 625,000 in3 NextReset
June 24, 2015

Chemistry
Calculate the amount of heat required to heat a50kg sample of ethanol from 13.0∘C to 18.0∘C Specific heat capacity of ethanol is 2.42 J/g∘C.? Please help
February 3, 2015

chemistry
What is the combustion of ethane (dicarbon hexahydride)
February 10, 2014

physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 m. if Bond gets a running start of 4.2 m/s ...
March 11, 2013

Physics
I would assume in the same direction as the train
March 11, 2013

Physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 m. if Bond gets a running start of 4.2 m/s ...
March 11, 2013

Physics
we haven't learned about potential energy yet? is there another way to solve this?
March 9, 2013

Physics
can you explain how you derive that equation?
March 9, 2013

Physics
A car with engine trouble slides 85 meters up along a 14 degrees ramp before coming to a stop. If the coefficient of friction between the tires and the road is 0.9, what was the velocity of the car at the bottom of the ramp? I get 32.43 meters / second is this correct?
March 9, 2013

Physics
my mistake. the weight is 150 kg not 1500, and .3 m = 30 cm
March 9, 2013

Physics
A traffic light is suspended midway across a 60 meter wide street by a cable that is attached to vertical poles on either side of the street. When the traffic light is hung in the middle the cable sags 30 cm. If the light is 1500 kg what should be the minimum tension rating ...
March 9, 2013

Physics
I found the answer, it is 1142.86 meters. I assume that the river was flowing East. so, the angle = arctan( .8 / 1.4 ) = 29.74 degrees. then tan (29.74) = offset / 2000 m = 1142.86 m
March 9, 2013

Physics
a boat crosses a 2 km wide river by starting out at the south shore and heading directly for the north shore if the river flows at 0.8 m/s and the boat can go at 1.4 m/s in still water, where on the opposite shore will the boat land?
March 9, 2013

Physics
a boat crosses a 2 km wide river by starting out at the south shore and heading directly for the north shore if the river flows at 0.8 m/s and the boat can go at 1.4 m/s in still water, where on the opposite shore will the boat land?
March 9, 2013

math
a 192 feet per second
October 10, 2012

math
it takes 30 min to drive to the movie theater.they saved frankensteins lunch begins at 10 ater one.what is the latest you can leave home?
May 21, 2012

Geometry
Find the volume of the given prism 17m 2m 1m
May 11, 2012

Chem
why don't nobel gases bond with other atoms?
January 23, 2012

Physics
The answer above is very stupid
November 2, 2011

MATH
HOW CAN YOU SOLVE 5X + 3 = 23
October 16, 2011

SCIENCE
WHAT IS THE AVERAGE SPEED [KM/H] FOR A CAR JOURNEY OF 120 KM THAT BEGAN AT 9:30 A.M. AND FINISHED AT 11:30 A.M.? HINT HOW MANY HOURS ARE BETWEEN 9:30A.M. AND 11:30A.M
October 16, 2011

SCIENCE
A TURTLE SWIMS 100 KM IN 10 HOURS. HE THEN WALKS FOR 25 KM IN 5 HOURS. WHAT IS THE TURTLE AVERAGE SPEED?
October 16, 2011

Physics
24.5 m/s*3s= 73.5m
October 9, 2011

math ASAP
please explain how to use doubles plus 1 and doubles minus 1
October 4, 2011

math ASAP
add. write the doubles fact used to solve each one. 0+1=1 6+7 =13 4+3=7 please explain how to use doubles plus 1 and doubles minus 1
October 4, 2011

math elementary
add. write the doubles fact used to solve each one. 0+1=1 6+7 =13 4+3=7 please explain how to use doubles plus 1 and doubles minus 1
October 4, 2011

Physics Urgent!!!!! I really need someone to check this answer!!!
Oh wait, I was using the angular speed of Mars, using the angular speed of Earth I get 13.4 radians and that will be more than two revolutions so the additional angle is 0.798 rad? Is that right?? Please someone answer...
April 8, 2011

Physics Urgent!!!!!
But 7.11 is just more thatn one complete revolution, then that's not the right anwer?
April 8, 2011

Physics Urgent!!!!!
If I substract 2pi from 7.11 I get 0.83... will that be the angle???
April 8, 2011

Physics Urgent!!!!!
Ok I got the 2 first ones right... 2.94 and my new value for b is 777.... I still cant get the last one, I thought that by multiplying Mars' angular speed and the time I got for part A that was going to be the answer.. I got 7.11 rad but that's wrong....
April 8, 2011

Physics Urgent!!!!!
Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on ...
April 8, 2011

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
April 8, 2011

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
April 7, 2011

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
April 7, 2011

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on ...
April 7, 2011

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
April 7, 2011

Derive the rocket equation M(dV/dt) = -u(dM/dt)for a rocket in the (constant) gravitational field near the surface of the Earth.
March 7, 2011

At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 13, 2011

At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 13, 2011

Physics
At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 13, 2011

Physics
At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 13, 2011

Physics
At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 12, 2011

Physics
At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the bowstring is vB, ...
February 11, 2011

Digit Problems
a four-digit number between 12 and 13 has an odd number in the hundredts place and an even number in the tenths
February 1, 2011

physics
If two marbles having mass of 27.7 grams and of 3.6 grams have stuck together where do they land and how much kinetic energy would be lost ?
December 9, 2010

physics
lol 1-2
December 3, 2010

a decimal form of 17 25
February 25, 2010

physics
T:3s F:0.33Hz T= 1/F F= 1/T
March 31, 2008

SOCIAL STUDIES
define polythesim
October 9, 2007