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Physics	Answer Question
what is a v-t graph?

Asked By neal17

Chemistry	Answer Question
Calculate heat required to convert 40.2 g of propyl alcohol from a solid at -150C into gas state of 115C. the heat of fusion is 86.2 j/g and heat of vap is 694 j/g. specific heats of solid,liquid, and gas states are 2.36, 2.833, and 1.86 j/g. I need help!!!

Asked By need help

Chemistry	Answer Question
when 0.600 g of Naoh is dissolved in 100.0 g water, temp rises from 25.00 to 25.98 C, calculate the amount of heat generated

Asked By need help

Physics	Answer Question
An arrow has just been shot from a bow and is now traveling horizontally. Air resistance is not negligible. How many force vectors would be shown on a free-body diagram?

Asked By Timmy Turner

Physics	Answer Question
You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. You find the arrow stuck in the ground 57.0 m away, making a 3.00degree angle with the ground. How fast was the arrow shot?

Asked By Timmy Turner

Physics	Answer Question
A car accelerates at 2.0 m/s^2 along a straight road. It passes two marks that are 30 m apart at times t=4.0 s and t=5.0 s. What was the car's velocity at t=0\;{\rm s}?

Asked By jarid

Physics	Answer Question
How many nanoseconds does it take light to travel a distance of 6.60 km in vacuum?

Asked By Tiffany

Physics	Answer Question
The light turns green, and a bicyclist starts forward with an acceleration of 1.3 m/s^2. How far must she travel to reach a speed of 7.8 m/s?

Asked By Jessica

Physics	Answer Question
What acceleration does a rocket need to reach a speed of 230 m/s at a height of 1.5 km?

Asked By Jeff

Physics	Answer Question
Please explain with details about Neil's Bohr's postulate one and two?

Asked By Nato

Biology	Answer Question
I want to know what a Gyarteric medicine is all about?

Asked By Nato

Chemistry

Answer Question

okay, I need help with these, plzz help! please balance them, some may already be balanced, i dont get this crap!!

14.)Al(OH)3+H2CO3 =>Al2(CO3)3=H2O

18.)Rb=RbNO3 => Rb2O=N2

19.)C6H6+O2 => CO2+H20

21.)C10H22+O2 => CO2+H2O

22.)Al(OH)3+HBr => AlBr3+H2O

23.)CH3CH2CH2CH3+O2 => CO2=H20

24.)C+O2 => CO2

25.)C3H8+O2 => CO2+H20

26.)Li+AlCl3 => LiCl+Al

27.)C2H6+O2 => CO2 +H20

28.)NH4OH+H3PO4 => (NH4)3PO4+H20

39.)Fes2+O2 => Fe2O3+SO2

*NOTE: THE NUMBERS ARE SMALL, THE COMPUTER COUNLDNT MAKE EM' SMALL, THANKS!!)

Asked By IanKusek

Chemistry	Answer Question
Can someone please balance Fe(2)O(3)+CO -------> 2Fe+CO(2) Numbers in () are subscripts Thanks

Asked By Jordan B

Biology	Answer Question
what is the role of chomosomes in reporduction?

Asked By Hannah B.

Chemistry	Answer Question
how do the atomic radii for anions and cations change as you go down a group..? and why does this happen?

Asked By Maryam

Organic Chemistry	Answer Question
Why do halogen substituents decrease the reactivity of benzene.?

Asked By Mahwish

Chemistry	Answer Question
In the reaction: C2H5OH + 3 O2 = 2 CO2 + 3 H2O Where the ethanol(C2H5OH) is burnt in a car engine. If 1 liter of ethanol is burned, then how much CO2 will be emitted in kilograms? (The density of ethanol is 0.789g/ml) I did the problem and got an answer of 1.578 kg's of CO2. However the way i did it was unconventional and wrong. I was wondering if anyone else knew how to attempt it. Thanks

Asked By Geoffry G

Chemistry	Answer Question
Are Lewis acid/base reactions also redox reactions...and vice versa?

Asked By Miguel

Chemistry	Answer Question
I'm not sure of this one. Can you help me balance this Ca(OH)2 + HNO3 ------> Ca(NO3)2 + H2O Thank you for your help!

Asked By Cathy

Chemistry	Answer Question
what volume of a 0.005g/mL sucrose solution must be diluted to prepare 500mL of a 0.300g/mL sucrose solution?

Asked By erin

Chemistry	Answer Question
I had a question on our quiz for chemistry that I could not answer. The teacher did not tell us how abundance (percent) is found in Atomic mass. She only showed us how to get the amu from mass (amu) x abundance (%). Question: How would you find abundance (%) with the isotope (Icant write small numbers!) 35CL Mass - 34.97? thank you for helping me before :) Cathy

Asked By Cathy

Chemistry

Answer Question

I'm having a problem with solving a couple of conversion problems.

1. A football filed is 300ft. long between goal lines.
a)How many meters does a player run if he catches the ball on his own goal line and scores a touchdown?
b) If a player catches the football and runs 45 yards, how many meters did he gain?
c) If a player runs at a speed of 36km/hr, how many seconds does it take to run from the 50-yard line to the 20-yard line?
T
The question I'm having a problem solving is "c". I can't figure out how to come up with the conversion problem to solve it. Our teacher is very perticular on how we do conversions.

This one is using a Percent as a conversion factor.

A plant fertilizer contains 15% by mass nitrogen (N). In a container of soluble plant food, there are 10.0 oz of fertilizer. How many grams of nitrogen are in the container?

Please help :)

Thank you
Cathy Emerdinger

Asked By Cathy

Chemistry	Answer Question
what is the molarity of a solution that contains 125 grams NaCl in 4.00 L solution?

Asked By kelsey

Biology	Answer Question
is cardiac cancer is possible plz give me detail abt cardiac cancer

Asked By Naveen

Biology	Answer Question
what is single cell protien?

Asked By Naveen

Biology	Answer Question
why cardiac muscles never get fatique?

Asked By naveen

Physics	Answer Question
a small dense ball with a mass of 1.5 kg is thrown with an initial velocity <5,8,0> m/s at time t=0 ata location we call the origin <0,0,0> m.

Asked By megan

Physics

Answer Question

2. P.29 projectile motion A small dense ball with mass 1.5 kg is thrown with initial velocity <5,8,0> m/s at time t = 0 at a location we choose to call the origin <0,0,0>m. Air resistance is negligible. A. When the ball reaches its maximum height, what is its velocity (a vector)? B. When the ball reaches its maximum height, what is time t? C. Between the launch at t = 0 and the time when the ball reaches its maximum height, what is the average velocity? D. When the ball reaches its maximum height, what is it location? E. At a late time the ball’s height y has return 0, which means that the average value of Vy from t= 0 to this time is zero. At this distance, what is the time t? F. At the time calculated in part E, when the ball’s height y returns to zero, what is x? G. At the time calculated in part E, when the ball’s height y returns to zero, what is Vy? H. What was the angle to the x-axis of the initial velocity? I. What was the angle to the x-axis of the velocity at the time calculated in part E, when the ball’s height returned to zero?

Asked By JOHN NGUYEN

Physics	Answer Question
2 ROCKS COLLIDE WITH EACH OTHER IN OUTER SPACE, FAR FROM ALL OTHER SUBJECTS. ROCK 1 WITH MASS 5 KG HAS VELOCITY <30,45,-20>m/s BEFORE THE COLLISION AND <-10,50,-5> m/s AFTER THE CONCLUSION. ROCK 2 WITH MASS 8 KG HAS VELOCITY <-9,5,4> m/s BEFORE THE COLLISION. CALCULATE THE FINAL VELOCITY OF ROCK 2.

Asked By JOHN NGUYEN

Physics	Answer Question
This is a very good program thanx to the expert that are answering our questions it's highly appreciated.

Asked By Madoda

Physics

Answer Question

Collision at an Angle
Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at speed 2v, while the second was traveling at speed v at an angle (phi) south of east (as indicated in the figure). After the collision, the two-car system travels at speed v(final)at an angle (alpha) east of north.

Find the speed v(final)of the joined cars after the collision. Express your answer in terms of v and alpha.

Asked By thuy nguyen

Physics

Answer Question

A ball of mass m moving with velocity Vi strikes a vertical wall. The angle between the ball's initial velocity vector and the wall is α, which depicts the situation as seen from above. The duration of the collision between the ball and the wall is delta t, and this collision is completely elastic. Friction is negligible, so the ball does not start spinning. In this idealized collision, the force exerted on the ball by the wall is parallel to the x axis. What is the final angle θ that the ball's velocity vector makes with the negative y axis?

Asked By john nguyen

Physics

Answer Question

A Game of Frictionless Catch
Chuck and Jackie stand on separate carts, both of which can slide without friction. The combined mass of Chuck and his cart, mcart, is identical to the combined mass of Jackie and her cart. Initially, Chuck and Jackie and their carts are at rest. Chuck then picks up a ball of mass, mball, and throws it to Jackie, who catches it. Assume that the ball travels in a straight line parallel to the ground (ignore the effect of gravity). After Chuck throws the ball, his speed relative to the ground is Vc The speed of the thrown ball relative to the ground is Vb. Jackie catches the ball when it reaches her, and she and her cart begin to move. Jackie's speed relative to the ground after she catches the ball is Vj

Part A Find the relative speed V between Chuck and the ball after Chuck has thrown the ball. Express the speed in terms of Vc and Vb V =

Part B What is the speed Vb of the ball (relative to the ground) while it is in the air? Express your answer in terms of mball, mcart, and V. Vb =

Part C What is Chuck's speed Vc (relative to the ground) after he throws the ball? Express your answer in terms of mball, mcart, and V. Vc =

Part D Find Jackie's speed Vj(relative to the ground) after she catches the ball, in terms of Vb. Express Vj in terms of mabll, mcart, and Vb. Vj =

Part E Find Jackie's speed Vj (relative to the ground) after she catches the ball, in terms of V. Express Vj in terms of mball, mcart, and V. Vj = =

Asked By thuy nguyen

Physics	Answer Question
How do you do conversion

Asked By Marsha Daniel

Physics	Answer Question
what is surface area?

Asked By sarah

Physics	Answer Question
An ounce of grass pollen contains approximately 6 billion grains of pollen. Approximately how much does one grain of pollen weigh?

Asked By Nicole D

Physics

Answer Question

Thanx for the advices the experts from this website have been providing it's highly appreciated and makes my studies 10 times easier. I have this other question/ problem assistance will be highly appreciated. A rocket is launched vertically upwards and experiences an acceleration of 400 m/s2 for 8 seconds. After this the engine is turned off and the rocket continues to rise ti its maximum height. a. How long after launching does the rocket reach its maximum height? b. What is the maximum height the rocket will reach? Your advise will be appreciated.

Asked By Ndoda

Physics	Answer Question
A stone is thrown horizontally from the top of a hill at a speed of 10m/s2. the stone reaches the ground 2 seconds later. a. What is the distance the stone travelled? b. What is the height of the hill?

Asked By sipho

Physics	Answer Question
A trolley, mass 2 kg and velocity 3m/s, collides with an identical, stationary trolley and sticks to it. The velocity of the two trolleys after collision, in m/s is?

Asked By Ndoda

Physics	Answer Question
A body, mass 5kg, is at rest on a frictionless horizontal plane. A force of 6 N acts on it for 10s. After this period, the momentum of the body will be: a. 60 kg.m/s b. 12kg.m/s c. 120 J d. 60 J e. 12 kg.m/s

Asked By Madoda

Physics	Answer Question
Calculate the acceleration of a car moving at a constant velocty of 120km/h.

Asked By Sipho

Physics	Answer Question
A plain flies 500km on a bearing of 90 deg and then 750 km on a bearing of 300 deg. the resultant displacement is: a. 250 km bearing 33 deg b. 400 km c. 630 km bearing 170 deg d. 400 km bearing 340 deg e. 310 km

Asked By Madoda

Physics	Answer Question
the current forces of 200N, 155N and 300N act on bearings of 60 deg, 130 deg and 225 deg respectively. The magnitude and direction of their resultant force, found by means of a graphical methord, is: a. 225 N bearing 160 deg b. 360 N bearing 230 deg c. 130 N bearing 80 deg d. 60 N bearing 140 deg e. 400N bearing 80 deg

Asked By Emmanuel

Physics

Answer Question

A plain flies in the dirrection 60 degrees E of N. In a Lull, the plain would have covered 80Km in that direction, but the cross wind allows the plane tp move 40 km right east. using parallelogram methord, the resultant displacement of the plain is: a. 15o km bearing 30 degrees N of E b. 80 km bearing 20 deg N of E c. 100km bearing 30 deg N of E d. 115km bearing 20 deg N of E e. 53 km bearing 20 deg E of N

Asked By Madoda

Physics	Answer Question
A ball is projected upwards from a platform 8m above the ground,with an initial velocity of 3m/s. How long does it take for the ball to reach the ground?

Asked By Emmanuel

Physics	Answer Question
Are there any practice problems I can do in Physics?

Asked By Kimberli

Physics	Answer Question
How much work does a male figure skater do when lifting a 50kg female skating partner's body. A vertical distance of 1 min a pairs competition

Asked By Destiny

Chemistry	Answer Question
which elemt dot correspond to Se?

Asked By kelly

Physics	Answer Question
In a historical movie, two knights on horseback start from rest 66m apart and ride directly towards eachother to do battle. Sir George's acceleration has a magnitude of 0.16 m/s2, while Sir Alfred's has a magnitude of 0.32m/s2. How far from Sir George's starting point do the knights collide?

Asked By Steven Fox

Chemistry	Answer Question
how many known chemicals are in the world? back in 1942 there was six hundred thousand.

Asked By nichole

Biology	Answer Question
My height is 5ft 3 inches. How do I convert that to mm, cm, dm, and m?

Asked By Shakira

Physics	Answer Question
I am studying quantum mechanics. Can you tell me how to solve the wave equation in three dimensions?

Asked By Rafael

Physics	Answer Question
What is Young's modulus measure?

Asked By Diego

Chemistry	Answer Question
Abbout the properties of metallic bond. What means malleability and ductility? The abillity of the metal to do what? Thanks

Asked By Maribel

Chemistry	Answer Question
why is the moleclar formula for NH3(ammonia) not H3N .Eg: water is H20

Asked By Vipin

Chemistry	Answer Question
What are the units for entropy?

Asked By stephanie

Chemistry	Answer Question
Can anyone tell me how to tell if something is a strong acid or a weak acid?

Asked By Bob Parker