# Posts by H

Total # Posts: 198

Physics special relativity
The distance from earth to the galactic centre is 23000 ly. What constant speed would be required to make the journey in 30 y of an astronaut's lifetime? I know the answer should be 0.99999915c but don't know how to get there with time dilation or length contraction

physics
A billiard ball travels 22 cm in the positive direction, hits the cushion and rebounds in the negative direction, and finally comes to rest 7.5 cm behind its original position.

English
correct

Yes, it's 3

algebra
What are the coordinates of these two equations after solving using substitution? 2x-y=-11 and x+4y=17

stats
106.9 oz

math
Solve the proportion using cross products. 8/20 = k/110 (A)99*^* (B)122 (C)3.3 (D)2.9 Am I correct? please asap

Social Studies
is it A? I'm taking this test

science
2. How many grams of 96.5% pure NaOH pellets do you need to make 1.000 liter of 1.50 N NaOH?

Physics
22.5

english
Getting done a plastic surgery will contain side effects leading quite severe pains such as: back pain, bruises and so on. This is so serious that you may have to wear head bandages after a surgery. Getting done a plastic surgery will contain side effects is not correct

Physic
You pull a 30.5 kg wooden box with a rope that makes a 23.0° angle with the horizontal at a constant speed. The coefficient of kinetic friction between the box and the deck is 0.330. You pull the crate a distance of 5.25 m. How much work was done? Do you use f=ma and how ...

statistics (math)
17.76

d
divide 120 into two parts , so that thrice the smaller one is equal to twice the larger one.

e
if 3 i subtracted from a number and reminder is multiplied by 13, the product becomes 91.find the number.

Life orientation
wat is the da question

AP Physics
A bridge 30 m long crosses a chasm. If the bridge is inclined at angle of 20 degrees to the horizontal, what is the difference in height of the two ends of the bridge?

Chemistry
How much heat would be absorbed by 55 grams of copper when heated from 24 degrees Celsius to 40 degrees Celsius? The specific heat of copper is .385 My answer is 338.8 Joules. Is this correct?

He can't see it if you are using a VPN! ;)

PHYSICS
WHAT IS CENTER OF MASS?

english
Water puts out a fire. Cold words calms down an angry person. What are some examples of cold words?

english
What does this quote mean: “Fire hath its force abated by water, not by wind, and anger must be allayed by cold words and not by blustering threats.” Please help. I have no idea.

History
hjlgkutfytc

History
hhhhhhhhhhhhhhhh

English
A b c d

math
d=69&a1=2

bible
Our God is amazing. List five descriptive words that you would use to describe the mind of our God. Think of creation and what the Lord did.

physics
jyhdjdjtdj

statistics
suppose that the teacher of this class graded solely on a curve - 10% get A, etc. How might this effect students getting into into study groups to prepare homework or tests?

geometric sequence
what are you dividing??

geometric sequence
The sum of the 2nd and 5th terms of a geometric sequence is 3.5. The sum of the 3rd and 6th is -7. Determine the ratio r of the sequence and the first term a.

chemistry
If 70.0 mL of water is added to 30.0 mL of 0.400 M solution of NaOH, what is the new concentration of NaOH?

C!! just took the quiz and got all of it right!

Physics
An 80.0 kg rollerblader is at rest at the top of a 100 m hill at a 7o incline. The coefficient of friction on the hill is 0.110. What is the roller blader's kinetic energy at the bottom of the hill?

maths
Two sides

Math
108

chemistry
The density of 19.0% by mass of nitric acid, HNO3 is 1.11 g cm-3. Calculate the volume (dm3) of acid needed to prepare 2.00 dm3 of 3.00 mol dm-3 HNO3 solution. (FW HNO3 = 63 g/mol)

english
What is the tone in "a thankless experience

Science
Thank you! Hope these are correct

math
dunno

math
2,3,5,7,8,6

calculus
A closed cardboard box is made with a square top and bottom, and a square horizontal shelf inside that divides the interior in half. A total of 12 square meters of cardboard is used to make the top, sides, bottom, and shelf of the box. What should the dimensions of the box be ...

calculus
A dog kennel with four pens is to be constructed. The pens will be surrounded by rectangular fence that costs $23 per meter. The rectangle is partioned into four pens of equal size with three partitions made of fence that costs$12 per meter. Each pen measures x meters wide by...

Chemistry
this was no help. at. all.

Math
0 is the intercept because the line passes through the axis at X=0 or y=0

Calculus
27 ft of wire is to be used to form an isosceles right triangle and a circle. Determine how much of the wire should be used for the circle if the total area enclosed is to be a maximum? I can only find the minimum because the parabola is opening upward

Chemistry
Electron exhibiting a particle wavelength of 7.18 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which ...

(History)
jhg

History Question
wow, ms sure you were wrong! thank you NO, for the answers! yours was all correct!

microeconomics
Question 20 of 20 5.0 Points If the government attempts to control pollution with a command-and-control policy: A. the government will control the firm's entire production process. B. the government will force the firm to use particular pollution-control technologies. C. ...

physics
a large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. if the time of the collision is 1 sec then, a) which vehicle experiences smaller force of impact? b) which vehicle experiences the ...

Physics
Suppose that we repeat the experiment shown in the video, but we replace one of the cylinders with a cylinder that has twice the radius (and use larger containers of water). If the height of the original cylinder is \rm h, how deeply must we submerge the new cylinder to get ...

chemistry

math
hhhhfdhfg

math
huj

Calculus
no

health
55

physics
6.213105e-10

Math
You

physics
3.5x10^9

physics
A key falls from a bridge that is 45 m above the water. The key falls straight down and lands in a model boat traveling at a constant velocity of 3.5 m/s. Calculate the distance the boat was from the point of impact when the key was released. Answer d= 10.6 m

physics
A ball is dropped from the top of a building. The balls fall 3 times farther during its last second of freefall than it did during its third second of freefall. The ball fell 4.9 meters during its first second, how tall is the building and how much time is the ball in the air...

math algebra
.075*10000 = .08x + .06(10000-x) x = 7500 ------ .075*10000 = .08*7500 + .06(10000-7500) .075*10000 = 600 + .06(2500) .075*10000 = 600 + 150 .075*10000 = 750 750\$

geometry
A swimming pool is 3 ft deep in the shallow end the bottom of the pool has a steady downward drop of 12 degrees if the pool is 50 feet long how deep is the deepest end?

Physics
.05

Calc
thanks for the first part. i wanted something that was more step-by-step for the second one.

Calc
Evaluate the integral using any method: (Integral)sec^3x/tanx dx I started it out and got secx(1tan^2x)/tanx. I know I just have to continue simplifying and finding the integral, but I'm stuck on the next couple of steps. Also, I have another question witht he same ...

Chemistry
just get the molar mass and use multiplication by one, meaning it would be mol/1 x grams(from molar mass)/moles(1)of the compound.

physics
ya

Chemistry
What mass of Ca(OH) 2 is required to make 1.5 l of a 4.0% (w/v) solution of Ca(OH)2 in water?

Calculus
Find the volume of the solid generated by revolving the region bounded by the line y=5x+6 and the parabola y=x^2 about the following lines: a) the line x=6 b) the line x=-1 c)the x axis d) the line y=36 Thanks!

Chemistry
A 50.0 mL graduated cylinder has a mass of 67.6 g. When it is filled with an unknown liquid to the 38.8 mL mark, the cylinder and liquid combined have a mass of 119.4 g. Calculate the density of the liquid in g/cm3. (1 mL = 1 cm3.)

Chemistry
the steps are right but its not al its zn.

calculus
Integral from pi/6 to pi/4 of 2sin(2x)cos(2x)dx=

physics
A wire 453 m long is in a 0.2 T magnetic field. A 2.56 N force acts on the wire. What current is in the wire? Answer in units of mA

algebra
solve by using the square root method: (5y+4)^2+100=0

23. 5.87 25. 9.035 27. 8.669 29. .143

calculus
The value of c for which f(x) = x + c/x has a local minimum at x= 3 is (a) -9 (b) - 6 (c) -3 (d) 6 (e) 9

English
22 is B. do you know 7) I wonder if my daydream of my neighbor's house being raided has worked its way across the street. ?

English
16 is the american. do you know what 11)I didn't care much for the poems she wrote. ?

2:1 or 2/1

Chemistry
.092

chemistry
what is the volume in liters of 3.0 moles CH4, at 26C and 1.48atm?

statistics
test

physics
hg

Chemistry
Idek

chemistry
nope

physics
a cat walking at 0.25 m/s sees a mouse and accelerates uniformly at 0.40 m/s (squared) for 3.0 s. what is the cat's displacement during this time?

Physics
A car starting from rest, accelerates at 5.0 m/s^2 fpr an unknown time interval. If the car travels 250 m in the acceleration period, what is the time interval?

physics
An object accelerates from 5.0 m/s to 100m/s. If the object traveled 250 m during this time, what was the acceleration?

Education
a and b

Science
Equal Masses of phosphorus and chlorine react according to the follow equation. 2P+3Cl2=2PCl3 Which reagent is in excess and what percentage of it will remain at the end of the reaction

Discrete Math
huho

physics
Set the centripetal acceleration V^2/R at the top equal to g. That will assure that the car does not leave the track.

physics 1
197.568

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