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how many moles of CH4 will contain 4.31 x 10^23 molecules

15 years ago

how many grams of phosphorus are there in 160 g of P4O10

15 years ago

what is the mass of one mole of carbon dioxide?

15 years ago

how many grams of Sb2S3 will contain 4.80 moles of S

15 years ago

use implicit differentiation to find dy/dx xlny=y^3=lnx

15 years ago

find the equation of the tangent line to y^3-xy=-6 at the point (7,2)

15 years ago

i need an urgen help with my eulogy can someone please help me, please. i cant do some parts properly,and am not sure of some parts. so really need help. This is a hard moment. It’s the moment we must say farewell to the to the brave young man, Callum McG...

14 years ago

A copper wire has a resistance of 24 Ω at 20°C. An aluminum wire has three times the length and twice the radius of the copper wire. The resistivity of copper is 0.6 times that of aluminum. Both Al and Cu have temperature coefficients of resistivity of 0....

14 years ago

A 2.00 kg block, on a horizontal surface with coefficient of static friction 0.900, is pushed by a force that is directed down at an angle of 30.0 degrees to the horizontal. Find the minimum magnitude of the force needed to get the block to start moving....

14 years ago

During a “brownout,” which occurs when the power companies cannot keep up with high demand, the voltage of the household circuits drops below its normal 120 V. (a) If the voltage drops to 108 V, what would be the power consumed by a “100 W” lightbulb (tha...

14 years ago

this question is about resistors in parallel. If i have a circuit, and it starts at point A with one resistor, then splits to flow to two resistors, and one of those two splits agin, to two more, then they all join again at the end at point B, what equati...

14 years ago

A uniform magnetic field points North; its magnitude is 1.5 T. A proton with kinetic energy 8.0x10–13 J (5.0 MeV) is moving vertically downward in this field. What is the magnetic force acting on it? I have no idea where to start with this question, can I...

14 years ago

A mass of 1.00kg is dropped from a height of 80cm onto a spring, of unstretched length of 20.0cm, which is resting on the floor. It comes to rest, momentarily, at a height of 10.0cm from the floor. If we can ignore friction, find the spring constant of th...

14 years ago

A ball player wishes to determine her pitching speed by throwing a ball horizontally from an elevation of 3.0 m above the ground. She sees the ball land 15 m down the range. What is the speed of the ball as it leaves her hand?

14 years ago

i need to describe my public identity by drawing. can you please give me some ideas? please? i want to know your public identity so that i understand mine. i don't know anything ... but is it ok if i say, i catch the bus to school everyday and i like shop...

14 years ago

why isnt there any correlation between the monthly rainfall and Ross River Virus?

14 years ago

The length of the auditory canal in humans averages about 2.5 cm. What is the second lowest standing wave frequency for a pipe of this length open at one end? Use 345 m/s for the speed of sound. I know that 4L=lambda, so lambda= 10cm. I know that f=v/lamb...

14 years ago

A child swinging on a swing set hears the sound of a whistle that is being blown directly in front of her. At the bottom of her swing when she is moving toward the whistle, she hears the higher pitch, and at the bottom of her swing, when she is moving awa...

14 years ago

The Hubble Space Telescope (HST) can resolve objects that have a small angular separation because there is no atmospheric distortion of the light. (i.e. The HST has excellent resolving power.) Its 2.4-m-diameter primary mirror can collect light from dista...

14 years ago

In a survery, students were asked whether they play basketball or tennis. Of 34 students, 24 play basketball and 13 students play tennis.4 students play neither. How many students play both sports? Is it 7 students?

14 years ago

State the number of complex roots of each equation then find the roots. I cant figure out these two! 1. 3x - 5 =0 2. c^2 + 2c + 1 = 0

13 years ago

What is the whole number or simplified answer to 3/35 divided by 9/7

9 years ago

A car traveling 35.0 m/s overtakes another car going only 22.0 m/s. When the faster car is still behind the slower one, it sounds a horn of frequency 1500.0Hz. What is the frequency heard by the driver of the slower car?

7 years ago

A car traveling 35.0 m/s overtakes another car going only 22.0 m/s. When the faster car is still behind the slower one, it sounds a horn of frequency 1500.0Hz. What is the frequency heard by the driver of the slower car? What is the altitude of the plane?

7 years ago

You hear the sonic boom of a high-speed jet plane exactly 3.10 s after it passes directly overhead in level flight. At the time you hear the boom, you see the plane at an angle of 22.0 o above the horizon. Assume that the speed of sound at the altitude of...

7 years ago

how did you get this?

15 years ago

oh I think I have found the answer! Sorry

14 years ago

I think the delta in front of voltage is just there because measured voltage is the potential difference, ie. delta

14 years ago

yes you were right, I only showed 5 and the question had six. I figured it out finally. What I didn't understand was that I had to find the resistance of the first set of parallels and then ADD that to the one beside it in series, then take the parallel o...

14 years ago

Thanks!

14 years ago

I used the eq. f=n(v/4L). Where n=3 bc that is the second lowest frequency in a tube with one end open.

14 years ago

okay, so I set it up as a ratio: [(1-v child)/v]*freq sound OVER [(1+v child)/v]*freq sound ALL THAT =1.05 So I have 1.05=[(1-v child)/343]/[(1+v child)/343] But I can't figure out how to manipulate this equation. I keep getting the v child as 341 m/s, an...

14 years ago

I guess I gave up too soon!

14 years ago

Hi Bob, I have to derive the error in the wavelength. I only know how to derive error equations from multiplication or addition/subtraction. For example, if I needed to derive an arror equation for N=MT it would be deltaN=(deltaM+deltaT)N So how do I do i...

14 years ago

sorry, edit, that would be (deltaM/M + deltaT/T)N

14 years ago

My prof says that the answer should be of magnitude 10^19. I'm not sure what he's doing differently. Is there another way to solve this?

14 years ago

I tried to get help from a friend, but her email just said to use tan theta = x/D. I'm not sure why she said to use tan theta, and when I do that-> tan 0.00001165*2.4m=x I get x= 0.000000487 which is obviously not right.

14 years ago

tan(theta) = opposite/adjacent angle of depression means angle below the horizontal, so draw a triangle tan(32 degrees) = x / 56 meters solve by multiplying tan(32 degrees) by 56 meters IN DEGREE MODE NOT RADIAN

6 years ago