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Total # Posts: 108,532

physics
a sled weighing 100lb reaches the foot of a hill with a speed of 40ft/s.The coefficient of kinetic friction between the led and the horizontal surface of the ice at the foot of the hill is 0.030.

Physics-Energy
what is missing?

Physics-Energy
Loop Track Location 1 Location 2 Location 3 PE (J) 0.16 0.12 0.04 KE (J) 0.03 0.06 0.09 TME (J) 0.19 0.18 0.13 h (m) 0.4 0.3 0.1 v (m/s) 1.2 1.7 2.1 Roller Track Location 1 Location 2 Location 3 PE (J) 0.12 0.08 0.04 KE (J) 0.03 0.06 0.07 TME (J) 0.15 0.14 0.11 h (m) 0.3 0.2 ...

Math
Thank u Ms.Sue

algerbra 1
(k^2-4k+3)-(k-2)

Calc
Find the derivative from x to x^8 (integral) of ln t dt.

maths
in a class the ratio of boys to girls is 3;4 there are 12boys in the class what fraction of the class are boys and how many girls are there

Math
1. The sides of triangle CAB are in the ratio of 2:3:4. Segment BD is the angle bisector drawn to the shortest side, dividing it into segments AD and DC. What is the length, in inches, of the longer subsegment of side AC if the length of side AC is 10 inches? Express your ...

Chemistry
In the following chemical reaction between H2 and Cl2 to produce HCl, what is the mass of HCl produced with 0.35g of H2 completely reacts with 12.42g of Cl2?

Physics
d = (1/2) a t^2 300 = (1/2) a (900) so a = 600/900 = 2/3 = 0.67 m/s^2 F = m a = 670 N

social studies
don't do those answers they are wrong thanks a lot douchebag the correct answers are as followed 1.d 2.b 3.d 4.b 5.a 6.c 7.a 8.d 9.a 10.c I promise you this will give you 10/10 don't listen to the douchebag that posted answers before me

science
Probably each circle designates a constant pressure but I do not know if you are talking about meteorology or what.

maths
Sum of four term in GDP is 30 sum of first and fourth terms is 18 then find the term

math
Let f of x equals 4 for x less than or equal to 3 and equals the quantity 7 minus x for x greater than 3. Use geometric formulas to evaluate the integral from x equals 1 to x equals 7 of f of x, dx. I got 16 but i dont think it is right.

Business Math
answers

Business Math
789

Math
You shoot a rifle at an angle of 42 degrees. The bullet leaves your rifle at a height of 6 feet and a speed of 810 feet per second. So I used the equation h(t)=6+(810 sin42)t-16t^2 to calculate that the bullet will hit the ground after 33.88580 seconds. Now how do I calculate ...

math
A farmer has enough food to last his 40 cattle 35 days. If he buys 50 cattle, how long can the same feed can last? Let X be the number of days the same feed can last

HISTORY
And so the American Rev ended 1783?

HISTORY
american revolution 1775 or 1763? Because I know the first battle was 1775 but I have to make a timeline and put when the event occurred so idk if I should put 1775 or when it all started, 1763.

Math
1/12

Social Studies
Please trust me, these are the correct answers: B D B C Have a good one! = )

Math Calc
John was wondering at what speed an arrow leaves a bow when it is released. So he went to a field and shot the bow at an angle of 45 degrees. The arrow hit the ground at a distance of 600 feet. Ignore air resistance. For simplicity, assume that the arrow is released at an ...

physics
32

Algebra
find the distance between the pair points (-2, -3) and (-12,-19)

chemistry
queous solution of sodium phosphate (Na3PO4). Adding which compound to the solution will cause a phosphate compound to precipitate?

Math
Find k so that (x-2) is a factor of x³+kx-4? Kindly help me this one

math
A train starting at 11 am travels east at 45 km / hr while another starting at 12 noon from the same point trivels south at 60 km / hr . how fast the train separating at 3 p. m

algebra
if you have a 15 ft ladder and angle it 75 degrees how far from the house will the base of the ladder be

algebra
if you have a 15 ft ladder and angle it 75 degrees how far from the house will the base of the ladder be

Algebra 1
the path is 2m

Math
The total length of 4 blue banner and 5 yellow banner is 49 m. The total length of 2 blue banner and 1 yellow banner is 17 m. All banner of the same colour have the same length. Find the length of a blue banner

Physics
two identical metallic ball spherical shells A and B charges 4Q and -10c are kept a certain distance apart a third uncharged sphere C is first placed in contact with sphere A and then with sphere B the sphere B are bought in contact and then separated find the charge on sphere...

math
c=1.5t+5

math
q4

Pre-Calculus
correction cot(?/2-?)cos?

Pre-Calculus
That is indeed hard, someone help this man.

Pre-Calculus
explain how to do these with please. I was out a couple of days so give clear instructions. sin(?/2-?)sec? cot(?/2-x)cos?

math
If f(x) is an even function and passes through the point (5, 3), what other point must lie on the graph of the function? Explain your reasoning.

Math
. The volume of a rectangular box is given by the expression V = (120 ? 6w)w2, where w is measured in inches. a. What is a reasonable domain for the function in this situation? Express the domain as an inequality, in interval notation, and in set notation. b. Sketch a graph of...

American History-WWII US
My Apologies Ms. Sue, Thank you for the Configurations.

American History-WWII US
Sorry Ms. Sue, I think there is a misunderstanding, I know all the Neutrality Acts, However, I am unable to know how all these acts connect together as the laws continued on.

American History-WWII US
How do the Neutrality Acts of 1935, 37, and 39 become less Neutral?

calculus
can someone also help me ndertsand this question ; y=x^3 +2x^2+3 represents the rate of an object over the interval [7, 10]. What is the average rate of the object over the time interval?

calculus
can someone help me with this problem y=x^2 -9 represents the velocity of an object over the interval [1, 5] in meters per second. What is the displacement of the object over the time interval?

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

English composition
Write a debate on the against the motion men should help at the kitchen

value
ACAR OF MASS 1200KG TRAVEL OF SPEED OF 20M PERSECOND IF ITS ENGINE DEVELOPS INTO 3KW,FIND THE FORCE USED

Chemistry
ahh

math
A skydiver jumps from an airplane at an altitude of 2,500 ft. He falls under the force of gravity until he opens his parachute at an altitude of 1,000 ft. Approximately how long does the jumper fall before he opens his chute? h(t) = -16t2 + vt + h0 A. 2.4 s B. 9.7 s C. 12.5 s ...

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

Math
Can someone please help me understand box-and-whisker plots? I get really confused on what each thing is and how to plot it. Thanks.

physics
calculate angular momentum and rotational kinetic energy of earth about its own axis

Maths
AB is a line segment and M is its mid point. Semicircle are drawn with AM,MB and AB as diameters on the same side of line AB. A circle (O, r) is drawn so that it touches all 3 semi circles . prove that r=1/6 AB.

Maths
Show that the mid point of line joining points (-5,12) and (-1,-12) is a point of trisection of the line joining the points (-8,-5) and (7,10).

Math
47

Math
You have to form a right triangle where the top of the cliff to the boat is the hypotenuse. Then to find how far the boat is from the foot of the cliff, you do cos(26.2)=a/90. To find how far the boat is from the top of the cliff, you do sin(26.2)=90/b.

Math
From the top of a Cliff 90metre high, the angle of depression of a boat on the sea is 26.2 degree.calculate how far the boat is from the from the foot of the cliff and from the top of the cliff

Statistics
Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be ...

health
The goal of health/safety education is...

Physics Answer Check
A note played by a musical instrument has a frequency of 130.8 Hz. What would be the length of the pipe if an organ pipe had this frequency as the fundamental and if the speed of the sound in the pipe is 350 m/s? f = v/2L 130.8(2L) = 350 2L = 2.68 L is about 1.34 m.

math
four times a number minus 8 is equal to two times the number plus 12

Math
Sorry It actually did

Math
The answer above didn't work

Math
Prove 3(x+1)(x+7)-(2x+5)² is never positive So, 3(x+1)(x+7)-(2x+5)(2x+5) =3(x²+8x+7)-(4x²+20x+25) =3x²+24x+21-4x²-20x-25 =-x²+4x-4

math
8 kilometer is how many meters

Economics
An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

Managerial Economics
An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

Physcis 1315
h=v?t+gt²/2, v=12 t=1 g=9.9

Physcis 1315
A ball is thrown vertically downward with a velocity of 12m/s How far has the ball fallen 1 s later?. 2s later?

math
Ann has $300 in a savings account that earns 1.75% simple annual interest. in how many years will she have$21 in Interest?

Physics
The angle between two vectors (F? and F?) is 90-28=62° The second angle of the force parallelogram is (360 -2•62)/2= 118°. Cosine law gives F=sqrt (F?² +F?² -F?•F?•cos118°)= 9.2 tan ? = (5+5.9•sin28°)/5.9•cos28° =1.49 ? = ...

Chem
Water was decomposed by the following reactions. Calculate the mass of HCl produced from 50.0 mL water assuming the following yields H2O=H2+O2 90% H2+Cl2=HCl

Chem
I need to do this using dimensional analysis

Chem
what mass of ammonia nh3 is necessary to react with 2.1 x 10^24 molecules of oxygen when ammonia reacts with oxygen to form water and nitrogen dioxide

Math
1. x+y = 9 2xy=40 x=9-y 2(9-y)y=40 y²-9y+20=0 y= 9/2 ±sqrt(81/4 – 20) y?=5, y? =4 => x?= 4, x?=5 2. x-y=4 x²+y² =208 x=4+y, (4+y)² + y² =208, y²+4y-96=0 y= - 2±sqrt(4+96) y?=8, x?= 12 , y? = -12 ( this root doesn’t meet ...

physic
The angular velocity is ?=v/R, the frequency is f= ?/2? the centripetal force is F=mv²/R

Physics
Work=Heat - internal energy W=A-U

PHYSICS
-------------a ....../1\..... ...../ 1 \.... B C

PHYSICS
--------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree

*physics*
what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.

Physics
A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also.

English
What did sodhi think of goeff

n
A ferris wheel is 20 meters in diameter and boarded from a platform that is 1 meters above the ground. The six o'clock position on the ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 6 minutes. The function h = f(t) gives your ...

Math
What is 7/3?

math
An open box is to be made from a square piece of material by cutting four-centimeter squares from each corner and turning up the sides (see figure). The volume of the finished box is to be 576 cubic centimeters. Find the size of the original piece of material.

physics
How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50?C to 50?C?

Algebra
In an infinite geometric progression with positive terms and with a common ratio |r|<1, the sum of the first three terms is (26/3) and the sum of the entire progression is 9. Determine the progression. Find the first term and common ratio

Algebra
Find the sum of the first five terms of an infinite geometric progression with a common ratio |r|<1 if the second term is (4/3) and the ratio of the sum of the squares of the terms of the progression to the sum of the terms of the progression is 3:1.

Measurement Unit Test Unit 1 Lesson 13
D A C B C

social studys
How did thjis all begin

math
What is the side length of the smallest square plate on which a 26?-cm chopstick can fit along a diagonal without any? overhang?

Science
1.A 2.B

Science
I meant burn

Science
although electromagnetic waves differ in the wavelengths they all travel at the speed of light which is A.300,00km/s B.6000km/h c.100km/s d.10,00km/s A rocket is a motor that can urn fuel without requiring A.water B.air c.electricity d.fire

Health
What are some ways to stay awake during studying for tests at night?

cience
Henry was given this cool toy for his birthday; he can use it to tell how fast someone is moving at that moment in time. The toy must calculate the person's

Algebra II
Determine if the binomial is a perfect square binomial. If so, show the original monomial squared. X^2 + 16 X^2 + 4

Math/Chemistry
ln(Ao/A)=kt => (Ao/A)=e^kt => Ao/e^kt=A => A=Aoe^-kt (1st order integrated rate law)

Math/Chemistry
This is from the 1st order integrated rate law => A = Aoe^-kt solve for Ao = A/e^-kt =Ae^kt (I showed solution for A in earlier post from (ln) function.)

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