# physics please HELP !

127,551 results, page 20

### Physics

Intensity of 4Mhz in 1.54mm = 2W/cm2 at 4cm intensity =? I know the answer is 0.32, but I do not understand why. Can you please explain? I did figure out that Attenuation= 8db. 4/2 x 4cm = 8db. Thank you in advance. I appreciate it!

### Physics

Help with this please. No idea. Except for a 22.00 min. rest stop, Emily drives with a constant velocity of 89.5 km/hr north. How long does the trip take if Emily's average velocity is 77.8 km/hr north?

### college physics

This site is just a front for liveperson Most college physics questions are not answered for months if ever. Out of "200 experts" you must have somebody who knows physics right? Guess not.

### PHYSICS HELP

Draw an arrow in the box that shows the direction of the force. Please help. I want to be sure. W > 0 W = 0 W < 0 ___ ____ ____ ___ ____ ____ d-> d-> d->

### physics b

If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is A Q B 2 Q C 3 Q D 4Q please help me asap

### math help please

(-3)^3-(-8)(-2)= -3 to the 3 power is -27 subtract -27 - -8 = -19 multiply by -2 =38 is this right please help (-3)^3-(-8)(-2) Use BODMAS rule So the answer is (-3)^3-16 ==>-27-16 =-43

### Math please help me

add the fractions 1/3, 5/6, and 3/8 reduce your answer to lowest terms please show your work thanks for the help

### trigonometry

Please solve this equation. As you write down the steps, please give me a description on what you did. y^3 - 16y^1/2 + 64 = 0

### Trig.

Please solve this equation. As you write down the steps, please give me a description on what you did. y^3 - 16y^3/2 + 64 = 0

### Language Arts PLEASE HELP

How do you do a word cited page? please help me so confused. Paper due tomorrow. Thank you

### math

PLEASE EXPLAIN HOW I CAN SOLVE MIXED NUMBERS PLEASE GIVE ME A EXAMPLE FOR PARTS THAT ARE SHADED THANKS

### Math -please check me

what is the perimeter of a rectangle if the length is 5/9 cm and the width is 2/9 cm? a. 5/9 cm b. 1 5/9cm c. 7/9 cm d. 1 7/9 cm the answer I got was 14/9 please help me.

### algebra

For the following please find (f o g)(x) and (g o f)(x). Also please report any shifts or changes in amplitude f(x) = cos(x), g(x) = 2x + 6

### English

Can you please tell me what a teen's life was like durin WWII? Please include sources

### algebra

i don't know how to do this with the fractions. can you please please help? simplify the expression and combine like terms. 2n^2+4m n^2-m _______ + ______ 3 3

### Algebra

Can someone please tell me what the domain of the following equation is? Please explain how you got that answer. g(x)=5^x

### Social psychology

Please help me define: maladaptive and adaptive. I've try googling it and unable to find please help. Thanks

### science

PLease someone help me!!! What are some of the names of acids and alkalis that are in shampoo!!! PLEASE HELP MEEEEEEEEEEE!!! thank youuuuuuuuuuuu!!!

### algebra

can someone please check my answer for me? 6-2x=6x-10x+14 I got x=-2 is this correct? if not please let me know which step I missed.. thank you

### Algebra 1

Formulas: Please solve the equation for x. y=2/3x+8 2/3 is a fraction. PLEASE SHOW YOUR WORK I REALLY NEED HELP.

### Algebra 2 honours

can someone please tell me how to factor out (x^6+1)^4? please show me how you got the answer... Thank You... :D

### Socials-Please Help

Can someone please go over my posts quickly, I was waiting for a response since yesterday:-(

### math

Please help me answer this.. Suppose that 2^(x/2)= p 3^(x/3-1)= q [5^(x/2)]/3 = r Express (0.48)^x in terms of p, q and/ or r. this question came from our reviewer.. please and thank you!

### PLEASE HELP - english

If something has a higher surface area what does that mean? can it me said that it is more thicker? please and thank you

### Geometry Please Help

/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

### Geometry Please Help

/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

### PHL/323

WHAT ARE SOME BLURBS FOR SCOTTS PAPER COMPANY? PLEASE PLEASE HELP IM ALMOST DONE AND THIS IS CONFUSING ME

### Please help!

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.

### Math

I SERIOUSLY need help! Solve the linear system by using substitution. x=6-4y 2x-3y=1 Explanation too, please! Please and thanks!

### combine functions.. please help.

Given: f(x)=2x^2-x+1 g(x)=2 sin x h(x)=3^x Determine: a) f(g(x)) b) (h^-1 o f)(x) c) g(f(h(x)))) Please show steps, thank you very much.

### chemistry

calculate the volume occupied by 10^22 molecules of a gas 300 k and 760 mm pressure. please help me please...................

### math (algerba 1) Please help!

x+y=0 3x+y=-4 Sovle each system of equation by graphing. If got the answer (-3,3), but it's not there. Please explain!

### Algebra

Please help me. Please show work. What are the domain and range of the function y=2 square root 3x + 4-5? *A.) X >/= -4/3; Y >/=-5 B.) X >/= 4/3; Y >/= 5 C.) X </= -4/3; Y </= -5 D.) X </= 4/3; Y </= 5 Thank You so much.

### CONFUSING QUESTION PLEASE HELP

Which of the following is the strongest reducing agent? a) Li+ b) Zn c) Sn d) H2 Is it Li? Can someone please explain what the answer is and why?

### algebra1 HELP PLEASE

find the value of x and y that make each equation true -4+(y)^i=-12x-i+8 please show the steps thanks

### Math

how do you write radicals as powers? please help me with the following question, I know the answer but I don't know HOW to get it. I must learn this so please help me. ãy 5/3

### alGEBRA 2 help please would appreciate

graph 36x^2-900=25y^2 show the step please

### algebra 2 help please would appreciate

3+(2x/x+4) divide x/x+4 please simplify the complex fraction thank you show work

### science... PLEASE HELP!

Please explain how the movement and position of the particles change when a liquid bevomes a solid.

### Pre Algebre-please help!

If there is a cylinder that is 3cm. tall and has a radius of 7.5cm. what is the surface area? Please help! Thanks!

### equations/mrs sue

11=22t please help having trouble please show the steps also 7r=-7/2, m/7 =12

### business

research please assist how do you start a hospital please give websites for contact information thank you

### Science

explain air resistance in terms of colliding particles Please Help...nothing to complex please

### math

12. What is the distance between P(–4, 3) and Q(6, 1)? Round to the nearest tenth. can someone please explain how to do this problem please

### math

12. What is the distance between P(–4, 3) and Q(6, 1)? Round to the nearest tenth. can someone please explain how to do this problem please

### english

WHAT ARE FEATURES OF A SHAKESPEARIAN COMEDY? ANSWER QUICKY PLEASE I NEED IT IN THE NEXT 10 MINUITES PLEASE.

### Algebra2 Help please

Compare the graphs of the inverse variations. Please provide at least 3 comparisons y= (-0.2/x) and y= (-0.3/x) -0.05, -0.075 , -0.1, -0.15 ?

### POLS210 D001

Please I am in desperate need of finding the answer to pop quiz 4,6,and 8 please is there anyone out there that could help me.

### Algebra

8. Which of the following expressions is equivalent to (-7)^5 -7 * -7 * -7 * -7 * -7 -7 * 5 (-7) * 7 * (-7) * 7 * -7 5 * 5 * 5 * 5 * 5 * 5 * 5 PLEASE HELP ONE OF THESE ARE SUPPOSED TO BE EQUAL TO (-7)^5 = -16807 BUT A AND C ARE :(( I'M SO CONFUSED PLEASE HELP :(

### socials 10 please help!!!

What was the outcome of the numbered treaties on the first nations? please give full answers thank you!!!

### Essentials og Psychology

The science of the mind questions please for Penn foster. No need of answers. Please help.

### Science

Can someone explain the idea of "structure affects function" please? And can you please give me an example?

### math-precalculus

help me please.. and please provide steps so I can follow. sec(2ϴ)=3... solve for all solutions on [0,2π]

### FRENCH WORK ASAP

please please someone check my work I don't understand it fully so I am asking if someone could please check my work thank you if it's too much I'm sorry. God Bless

### Physics please help !

A Goodyear blimp typically contains 4770 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 274 K. What is the mass (in kg) of the helium in the blimp? You asked this twice. See my response to your later post.

### physics

please someone give me a hand at this problem. . . Describe the Bohr model of the atom. What is Bohr’s key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?

### physics

please check my answer An electron moves north at a velocity of 9.8 * 10^4 m/s and has a magnetic force of 5.6 * 10^-18 N west exerted on it. If the magnetic field points upward, what is the magnitude of the magnetic field? F=BqV F= 5.6 * 10^-18N q= 16 * 10^-19C V= 9.8 * 10^4 ...

### help with physics please!

2.50 kg particle (the function U(x) has the form bx2 and the vertical axis scale is set by Us = 2.0 J).(a) If the particle passes through the equilibrium position with a velocity of 55.0 cm/s, will it be turned back before it reaches x = 18.0 cm?(b) If yes, at what position (...

### college physics

A 12100 kg railroad car travels alone on a level frictionless track with a constant speed of 20.5 m/s. A 5850 kg load, initially at rest, is dropped onto the car. What will be the car's new speed? Please help!

### Physics

A point (labelled P in the figure) is attached to the rim of a disk of radius 0.2 m, which can turn around an axis through its center. It is rotating counterclockwise with a speed of 2.5 m/s. Can someone please step me through the problem step by step?

### physics

Find the final velocity of the two balls if the ball with velocity v2i = -19.5 cm/s has a mass equal to half that of the ball with initial velocity v1i = +26.8 cm/s. PLEASE HELP!! i have tried so many different ways and can't seem to get the answer

### physics (please help!)

A projectile of mass 0.539 kg is shot from a cannon. The end of the cannon’s barrel is at height 6.4 m, as shown in the figure. The initial velocity of the projectile is 9 m/s . How long does it take the projectile to hit the ground? Answer in units of s

### Physics(Please help)

A skier slides horizontally along the snow for a distance of 11.9 m before coming to rest. The coefficient of kinetic friction between the skier and the snow is 0.0458. Initially, how fast was the skier going? I do not know how to start this. Thank you.

### Physics - PLEASE HELP

A 25-kg uniform ladder 10-m is leaning against a frictionless wall. The ladder is making an angle of 32° to the ground. What is the magnitude of the total force exerted on the ladder by the ground? 675 N 462 N 245 N 543 N 314 N

### Physics

A particle travels along the x axis with a constant acceleration of +2.7 m/s2. At a time 4.2s following its start, it is at x = -108 m. At a time 5.7 s later it has a velocity of +13.0 m/s. Find its position at this later time. Please use kinematic equations to solve.

### Physics

A 1550 kg car is traveling with a speed of 12.4 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.3 m? I found the force of the car to be 14700 by using F=ma. I am confused on what to do with the rest of the ...

### Physics

A rock is thrown straight up at 22.0 m/s from a roof of a 30.0 m tall building. After rising, the rock falls on the street below. Ignoring air resistance, how much time is the rock in the air? Show the work please :)

### AP Physics

can you please explain this to me... Were given this eqaution x = At^2 + B were A = 2.10 m/s^2 B = 2.80 m ok and this is an example problem and it's wlking us through it find the instantaneous velocity at t=t2=5.00s equlas the slope of the tangent to the curve at point P2 ...

### Anthropology

I need some serious Assisting. PLEASE!!!!I am doing a project on gender and gender roles including identities and the equality and inequality. The Culture is Native American. I need help a.s.a.p. This is my last week in this class. Please, please help me. Thank you so much. I ...

### math please help

someone please show how to do Simplify, if possible: 6x^2y^3+9x^2y^3/3x^2y^2

### math

solve for x 3x^2 + 2x - 5 = 0 you foil it and get: (x - 1)(3x + 5) but i don't know what to do from here. please please pleasee help.

### Math(algebra)

Please help me solve this problem 2/5(2x-3)> please show me how this is done

### college

Please help. I'm stuck. Solve: 20/5p+3/5q-6/5p+14/5q Please show me the steps. Thank you

### prealgebra

Simplify: Can someone please help me with this and go through the steps for it please. Thank You -8z(-9z^2-z-1)

### Math

Can u please guide me on solving these two equations please. Thank You 3.6-7.6 (-8.3)-11.4

### Please Help

Can someone please take a look at my french posts, thanks.

### Ms. Sue please help

Pigskin week seven interstates help please

### geometry please help

please help me with the question I posted at 4:56pm today

### science

please help me write a paragragh please it is due tommorow.

### algebra

I need help with these problem please. X^2+6=15 (x+4)^2=6 can some one help me please.

### english please

does being shy can effect my education? please help and thank you

### Math

Please help me factor this. x(-x^3-4x^2+3x+18) (using synthetic division please.) Thank You.

### PLEASE HELP!!!!

if log6=m and log 5=n, write 7.2 as an expression in m and n Answer is 2m-n Please help me!!

### Math.

Please help! |x+1|-3 > 8 Solve the absolute value inequalities. Please and thanks.

### Math

2(27+4x)+7x=21 Please help me solve this problem and show your work please and thank you

### Math PLEASE HELP ME!!

What is 14% of 120?? PLEASE SHOW ALL WORK, THANK YOU!!!

### math

(10x+2)-(x-10) simplified please! Thank you,please show the work!

### algebra

please help Solve for h in U= mgh. Please show steps.

### Please Help

Can someone please help with the chemistry problems? I need them to study.

### Math

what property is 7(2-p)=14-7p Can you please answer this question ASAP please?

### chemistry help~Please!!!

What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!

### Algebra2

Please,Please explain how you get your answer."And"compound inequality -1<3+2x<11 and 1-x>-3 or 5x-1>19 - - Thank You

### BIology

please answer mine ms sue if you can. if not, can you please say you cant

### Math to hard please help

I was skipped over can someone please help me. Thank you

### Math please help

1- x/x-5+7x/x^2-3x-10 Please simplfy and show all work thank you

### physics

In a physics lab, students are asked to predict how the acceleration of the block sliding up a ramp compares to the acceleration down the ramp compares to the acceleration down the ramp. The block slides up a somewhat rough surface inclined at an angle of theta above the ...

### Physics

One device used for throwing spears is an atlatl. This device was used by human hunters over 20000 years before the invention of the bow ad arrow. It effectively increases the length of the hunter's arm allowing a spear to be thrown further than it could be by hand alone. A ...

### Physics

You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q 1 to Q2, the electric field is zero. Are Q1 and Q2 like or unlike charges? How many times greater is Q2 than on Q1? I am really confused on this problem. Please...

### HELP PLEASE! Physics!

SO CONFUSED!!! Why can't submarines go to the bottem of the ocean? It is to do with pressure gradient Total nonsense. Subs go to the bottom of the ocean each time they sink. Now if there is an inversion layer, either thermal or salinity, they can "float" on that layer, but ...