Wednesday

October 26, 2016
Total # Posts: 57

**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*

**additional maths**

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*

**Physics (please help!!!!)**

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*

**Physics (please help!!!!)**

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*

**Physics (please help!!!!)**

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*

**Physics (please help!!!!)**

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*

**Physics Please help!!!**

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*

**Physics (please help!!!!)**

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*

**Physics...help please!**

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 (please help)**

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*

**6th grade math**

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*

**word unscramble please**

please help whith this word ievcmriten thanks eduardo

*September 28, 2006*

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