physics please HELP !

126,957 results, page 58


Design some simple digital circuits based on Boolean expressions. Draw circuits that implement the following Boolean expressions using some combination of AND, OR, NOT, NAND, and NOR gates. - NOT X OR NOT Y OR Z - X OR Y OR NOT Z - NOT X AND Y OR NOT Y AND Z Write a two to ...


1)The difference of potential between terminals of a battery is 6V. How much work is done when a series of negative charges totaling 0.5 C are moved from one terminal to another? 2) Two parallel metal plates have opposite charges and a difference of potential of 1000V between ...

Physics. Please help!

A green sedan weighing 25,000 Newtons is put on a lift supported by a piston with a cross sectional area of 0.1 square meters.  What is the minimum force that must be exerted by the air compressor that pushes down on the oil in the reservoir of the lift system in order to ...


I am getting the wrong answer. Can you please check my work? My answer is off by a multiple of ten. A sample of an unknown material appears to weigh 295 N in air and 165 N when immersed in alcohol of specific gravity 0.700. (a) What is the volume of the material? ___________m^...


A metal container, which has a mass of 9.4 kg contains 14.2 kg of water. A 1.7-kg piece of the same metal, initially at a temperature of 160.0°C, is dropped into the water. The container and the water initially have a temperature of 15.0°C and the final temperature of the ...


In a hydraulic lift, the radii of the pistons are 2.93 cm and 10.1 cm. A car weighing W = 11.0 kN is to be lifted by the force of the large piston. (a) What force Fa must be applied to the small piston? N (b) When the small piston is pushed in by 10.4 cm, how far is the car ...


I have no idea. Please help. Thank you. The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate ...

Math, Please Help!!!

4/x^2 - 4x + 3 < 5/x^2 - 9 This is a rational inequality. it is 4 divided by x squared minus 4x plus 3 is less than or equal to 5 divided by x squared minus 9. Please help!!!


I'm stuck on this question please help. "GK bisects angle FGH". If angle FGK=8v-2 and angle KGH=3v+3,find angle FGH. PLEASE HELP ME


Hi, I need help. Does desertification come from Ancient China or Ancient Africa? Please I really need the help fast. Thanks so much!

Physics help please**

A water pipe having a 2.1 cm inside diameter carries water into the basement of a house at a speed of 0.88 m/s and a pressure of 169 kPa. The pipe tapers to 1.0 cm and rises to the second floor 7.1 m above the input point. (a) What is the speed at the second floor? ? m/s (b) ...


1. Please prepare a pencil and an eraser before starting the test. 2. Please prepare for a pencil and an eraser before starting the test. 3. Please prepare a pencil and an eraser for me before starting the test. 4. Please prepare for a pencil and an eraser for me before ...

Pre-Algebra please help me!!

X- 0 1 2 3 4 5 6 Y- -7 -4 -1 2 5 8 11 this is a x and y table I need to find out wat the rule is to get y. So the equation would start out like: Y=?????? wat do u need to do with x to get y? and I need help badly! so please!

Math(Please help)

Evaluate: f(x,y)=2x^3e^y a) partial derivative with respect to x. I know that you have to treat y as a constant but I have no idea what to do. I do not understand partial derivatives at all. Please help!! b) partial derivative with repsect to y.

Pictures Of HBC

Since I am doing an Ad on the HBC. Could I get links to pictures. I don't know what to draw, anything easy please. Like a beaver, a boat, could you please give me links to items the HBC sold?

Please help math

suppose a triangle has an area of 10ft^2. IF the base of the triangle is 1 foot longer than the height of the triangle, what are the lenghts of the base and height? please help and show work so i understand how to do it


How can I calculate the spring constant given only the following: equilibrium length of spring: 10.5 cm stretched length of spring (by attaching a mass): 12.5 cm object's mass: 198.9 grams -please help me...I'm really lost... You need to assume that the measurement was made at...


A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 5.75 rev/s while rotating through one-half of a revolution. How much time does this maneuver take? Divide 0.5 revolutions by the average angular ...

geometry PLEASE

imageshack(.)(us)/photo/my-images/42/2vja.jpg/ Open that link please , just delete the parentheses please please help me with my assignments I beg you cooperate with me huhu 1. in the figure , the areas of traingle cef, triangle abe, triangle adf are 3,4, and 5 respectively. ...


At a fair run by a local charity organization, it costs 50 cents to try one’s luck in drawing an ace from a deck of 52 playing cards. What is the expected profit per customer, if they pay $4 if and only if a person draws an ace? The probability of drawing an ace is 4/52 or 1...


Claire wants to determine how brightly to illuminate her stage. stage width (in metres) x stage length (in metres) x 0.14 = total watts for stage If her stage is 7.25 metros wide and 11.5 metres long, a) calculate the exact number of watts needid to illuminate the stage b) ...


Claire wants to determine how brightly to illuminate her stage. stage width (in metres) x stage length (in metres) x 0.14 = total watts for stage If her stage is 7.25 metros wide and 11.5 metres long, a) calculate the exact number of watts needid to illuminate the stage b) ...

college (Physical Science/Physics)

I am having difficulty with this equation. I have been working with it for several weeks! Please Help. the equation is this: solve for Lf Lf=[(CwMw+CsMs+CcMc)(To-Tf)//Mi-CwTf values Cw=1.00; Mw=143.4; Cs=0.11; Ms=30.0; Cc=0.22; Mc=57.7;To=23.9; Tf=14.2;Mi=16.7 I keep comming ...

Physics- Elena please help!

An accelerometer in a control system consists of a 2.42 g object sliding on a horizontal rail. A low-mass spring is connected between the object and a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the ...


A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a constant force during this ...


The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would fall 0.809 meters by the time it reached home plate, 18.3 meters away. How fast was the pitch? So for i know that change in y ...

please check this Physics

A 5kg block slides along a frictionless surface at 8 m/s toward a second block that is 2kg and attached to the end of a spring,The spring has a constant of 250N/m . When the blocks collide they stick together. What is the speed of the two blocks immediately after the collision...

Physics , static fluids

A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g, then solved for ...


could someone please give me a site from which I can start to memorize ALL this socials stuff, like the renaissance, black death,etc. I don't want a site which inlcudes reading in it I would like to have a site with pictures bubbles included, please HELP


A 1.250 g sample of copper wire was heated in air and reacted with oxygen to give 1.565 g of copper oxide product. Calculate the empirical formula of the copper oxide. Please help I'm lost. I need step by step Please and thank you


Hi this question was already asked but there is still no correct answer. I can't seem to solve this for x correctly...I got 128 over 55 as an answer which can't be correct. Please help me find the correct answer! Thanks The equation is: .05x-.6(x+2)=.08 Please show the work as...

physics help 4 please!!

Two turtles (each 2 kg) sit on an approximately massless branch in the water. They sit on opposite sides of the branch's center, each 3 m away. The branch (10 m long) is spinning at 2 rad/s about its center (nearly without friction). Now, if both turtles walk to the ends of ...


PLEASE SEE ADDITIONAL QUESTION AT BOTTOM. A pendulum was set up and measurements were made to enable the mechanical energy to be calculated at the start position S and the lowest point of the pendulums swing L. The mass of the pendulum bob was determined on an electronic scale...


This is a pretty simple physics problem, but I do not know how to go about it. How do I: Show that the time required for a projectile to reach its highest point is equal to the time for it to return to its original height?


would it be possible to view your body from head-to-toe, while standing in front of a plane mirror that is only as tall as you? this is in the chapter mirror on my physics books


A mass (m) rest on a frictionless slope within our physics lab room. The angle of the ramp with respect to the floor is 35 degrees. What is the magnitude of the mass's acceleration?


A mass (m) rest on a frictionless slope within our physics lab room. The angle of the ramp with respect to the floor is 35 degrees. What is the magnitude of the mass's acceleration?

Physics Help Please! Decay Questions

archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and the decay constant for...

Physic please check

A person stands 4.2 m in front of a wall that is covered floor-to-ceiling with a plane mirror. His eyes are 1.9 m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the ...


A steel ball has a mass of 4.0kg and rolls along a smooth, level surface at 62m/s. A) Find its kinetic energy(i got this and its 7688 joules) B)?????-At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 meters to give it the ...


according the graph sown, the net force acting on an object varies wth the object's displacement.calculate the work down by the force on the object at the various displacements listed below (i won't bother telling you since you don't have a graphy, but I figured out the work ...


Which of the following is a unit of temperature? celsius degree joule (my choice) kilogram calorie My first choice is joules and then maybe celsius but not real sure. Can someone please help? My other question is using newtons second law of motion if the force on an object is ...


Which of the following is a unit of temperature? celsius degree joule (my choice) kilogram calorie My first choice is joules and then maybe celsius but not real sure. Can someone please help? My other question is using newtons second law of motion if the force on an object is ...

Physics- Elena please help!

An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 114.0 dB as 172 cars pass outside the window every minute. (a) What is the sound intensity during the day ? (Reminder: If you choose to use ...


You want to push a 66-kg box up a 30° ramp. The coefficient of kinetic friction between the ramp and the box is 0.35. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed? N Physics - bobpursley, Thursday, ...


A technician needs to determine the amount of energy required to increase the temp. of a vat containing 12 kg of water. The water enters the vat from the water mains at a temp. of 15 deg C. The technician knows that the final temp. required is 90 deg C. How much energy is ...


Please can someone help me before i pull all my hair out i've been struggling with this for about a week CH2=CH-CH-OH ________' _______CH3 i need to polymerize this compound and draw the structural formula it needs to contain three monomer units and i need to state the ...


Please I need help making these two questions shorter for the title of my essay: How is Mr. Chiu’s incarceration in “Saboteur” parallel to the student protest in Tiananmen Square? What is the author’s opinion of the Chinese government, as revealed by the setting ...


can someone please help me find the story, "The Tale of Sir Launcelot du Lake" on the internet by giving me a link. from Le Morte Darthur Sir Thomas Malory retold by Keith Baines. it starts with " When King Arthur returned from Rome..." and ends with "My lady, please, if ever ...

Algebra 2

I've been stuck on this problem forever. Can someone please explain to me what to do from here? The design of a digital box camera maximizes the volume while keeping the sum of the dimensions at 6 inches. If the length must be 1.5 times the height, what should each dimension ...

@Online Students

A student recently posted this. "quick backstory; i've been cheating on all of my work except portfolios this whole year cause i'm in online school. but i'm wanting to learn since there's gonna be ACT test in REAL so... please help me on how to do this!" Please heed his ...

Physics _ Please please help

The cross-sectional area of the U-tube shown below is uniform and is equal to one square centimeter (1.00cm^2). One end is open to the atmosphere. Atmosphere pressure may be taken as P1=1.01 * 10^5 Pa. The other end of the U-tube is connected to a pipe in which a constant gas ...

Computer Programming

I need a check on my answers 1) prompt a user to enter an employee name, employee id, and hours worked until a value of "-1" is entered for employye name. my answer: Start Declarations num EmployId, HrsWrked string EmployName housework() detailLoop() Stop housework() output "...


I have to design a procedure which allows me to calculate the applied rocket thrust force of a stomp rocket. The only materials I am allowed are stop watches, rulers, measuring tape, protractors and the stomp rocket. Basically it all has to be done mathimatically. I so far ...

Physics(Please Help!!)

Matt forgot to put the fabric softener in the wash. As his socks tumbled in the dryer, they became charged. If a small piece of lint with a charge of +1.25 E -19 C is attracted to the socks by a force of 3.0 E -9 N, what is the magnitude of the electric field at this location...

physics help please

an air puck of mass m1= 0.25 kg is tied to a string and allowed to revolve in a circle of radius R=1.0m on a frictionless horizontal table . the other end of the string passes through a hole in the center of a table and a mass of m2=1.0kg is tied to it. the suspended mass ...

Physics, Math, Electronics

PROBLEM: A typical 12-volts battery is rated according to "ampere-hrs". A 70-Ampere-hour battery for example, at a discharge rate of 3.5-Ampere has a life of 20 hrs. Questions: a.) assuming the voltage remains constant, obtain the energy and power delivered. b.) Repeat for a ...


Subtract: express your answer in simplest form. 2/5 - y/y-2 answers a)-3y-2/y-2 b) -3y -2/5(4-2) c) -3y-4/5(y-2) d) -3y-4/y-2 The way you have written the problem, is 2/5 minus y^3. I don't think that is what you meant. Please use grouping symbols on fractions () or [] The way...


please check: A battery converts what type of energy into electrical energy? a. mechanical b. nuclear c. solar d. chemical D When a parallel-plate capacitor is connected to a battery:a____ is stored on one plate, and a ___ is stored on the other a. negative charge, positive ...


a uranium-238 nucleus may stay in one piece for billions of years, but later it decays into an a particle of mass 6.64 x 10^-27 and a thorium-234 nucleus of mass 3.88 x 10^-25. The decay process itself is extremely fast (about 10^-20 s). Suppose the uranium nucleus was at rest...

physics help please

A double-slit experiment is performed with light from a Helium Neon Laser on two slits 80 micrometers apart. The first bright interference fringe left of the center is spaced 2m from the bright center. How far away from the double slit is the screen? wavelength =632nm What ...


out of growth of schools, racial discrimination, and education for immigrants, which educational development do you think was most important? Explain. Please remember that we are here to help you learn to do your own work, but not to do it for you. Once you have written your ...


does anyone know what a manufacturing specification is for food coursework?? im sooo stuck and it has to be in tomorrow =[ please help me :D x Thank you for using the Jiskha Homework Help Forum. Since I'm not sure exactly what you are looking for, I hope the following site ...


I was wondering if someone could please explain this to me (please don't give me links to websites, I already have a thousand saved under my favourites, I just don't understand how to find my answer from the information the websites have provided). Question: What would the ...

chemistry please help!!

4{C3H5(NO3)2}(l)--->6N2(g)+O2(g)+12CO2(g)+10H2O(g) If a dynamite of 100mL needs 3.5atm to explode, what minimum mass of C3H5(NO3)2 do I need to put in at 25 degree celcius? I tried to do this by finding the number of moles by the formula PV=nRT and then convert that into ...


I posted this below, and no one answered. Please help with this very complicated question! Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation dy/dx= 2/27(x-3)SQUARE ...


I posted this below, and no one answered. Please help with this very complicated question! Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation dy/dx= 2/27(x-3)SQUARE ...


Application problems and converting decimals is not my forte. Please help me? Dick mows the lawn in 7 hrs. Mary can do the same yard in 6 hrs. How much time would it take for them to mow the lawn together? (They are sober btw) 8.26 x 10^7 Convert to decimal notation please. I ...

7th grade math Ms.Sue please

At the halftime show, a marching band marched in formation. The lead drummer started at a point with coordinates (–2, –5) and moved 3 steps up and 1 step right. a. Write a rule to describe the translation. b. What were the coordinates of the drummer's final position? Can ...

Visual Basic Programming...Very Urgently!!!

Please Can someone help in proving the code about transactiopn program of images. it must have a two diffetrent form that will perform simultaneously which menas that first form will have login password to log in to use the transaction. Please your help is muchly appreciated.

Social Studies

How did the Supreme Court decision in Worcester v. Georgia and the Indian Removal Act lead to the removal and resettlement of Native American groups? Please help me I looked at every website and information for a answer but I'm new to connections academy and I'm really stupid ...

Science - please please help

1. Explain why conduction, convection, and advection cannot occur in space. ^is it cause there is no gravity in space? 2. Does warm water rise or fall in cold water? Explain why this happens. 3. Explain why rocks and soil are poor heat sinks. Thanks in advance.

chemistry, Please help.

Please tell me where I can find the articles ( free) to represent the Setvens rearrangement and Favorskii rearrangement. I have to have them for presentation but I have not taughed about these reaarangenment yet. I hope somebody on Jiskha will help me to find it. I really ...

Chemistry need response ASAP please

Calculate the mass KHC8H4O4 (molar mass= 204.44 g/mol) that reacts with 15 mL of the NaOH solution. Express this mass KHC8H4O4 to the correct number of significant figures. Please, help I have no idea how to do this. What will the mass be of KHC8H4O4? Thank you for help!


Can someone help me find some polls or info on the original LAPD SWAT officers who were wounded and killed in action from the late 1960s-1982 please. And can someone explain to me what anti-SWAT opinions are as well as pro-SWAT opinions please.


Assume that f is a continuous function from the real numbers to the real numbers such that for all numbers x,y, and a it is true that f(x+y)=f(x) + f(y) and that f(ax)=af(x). Further assume that f(1) = pi. Find f'(-1). Please explain your reasoning. I am so confused. Ive read ...


Which of the following contains the most mechanical energy? A 10 kg ball at the top of a hill 10 meters high A 5 kg ball rolling with a velocity of 12 m/s A 10 kg ball rolling with a velocity of 5 m/s A 5 kg ball at the top of a hill 10 meters high HELPS PLEASE!!!!

Physics(Please respond)

Vector A has a magnitude 2.4m and direction 130 degrees relative to the positive x-axis. Vector B has magnitude 3.0m and direction 250 degrees relative to the positive x-axis. 1) The resultant R=A+B has magnitude(in m) ? I know the R =2.75m but I am not sure how to get this. I...

Math - Please Help Check My Answer

Please help me with the following question: A student attempts to solve for c in the equation below. Which statement best applies to the work shown below? 3c + 6 - 4c - 12c = 7 -13c + 6 = 7 -13c + 6 + (-6) = 7 + (-6) -13c = 1 c = -1/13 A. The student followed all rules ...


four forces act on a hot air ballon 356 N north 129 N west 297 N east 156 N south a)find the magnitude of the resultant force on the balloon. i already found this one out. i got magnitude to be 261.197N b) find the direction of the resultant force (in relation to the 297 N ...


Hi! could anyone help me please, I have no idea how to this at all. I try to it but, the did not get the right answer. Thank for your help Oppositely charged parallel plates are separated by 5.34 mm. A potential difference of 600 V exists between the plates. (a) What is the ...

physics please help! 116

Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412 N, and the other has a weight of 908 N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the ...

Physics Please help!

In each of the following cases, the mass is 7.99 kg and the radius is 7.50 cm. (a) What is the moment of inertia (kg/m2 ) of a solid cylinder rotating about an axis parallel to the symmetry axis but passing through the edge of the cylinder? (b) What is the moment of inertia (...


Two particles having charges of 0.580 nC and 20.9 nC are separated by a distance of 1.10 m . Where would the net electric field be zero if one of the charges were negative? Enter your answer as a distance from the charge initially equal 0.580 nC . keq1/r^2 = keq2/(1.1-r)^2 (...


Kate (m = 50 kg) is swinging on a tire tied by a (light) rope (L = 3 m) to a tree limb. Her twin Ashley comes along and squeezes into the tire with her. Assume that at all times the centre of mass of the person(s) riding the tire is at the end of the rope. a) What was the ...


Ok, I figured this out (I think) but can you please check? Don't worry. I can carry the tent all by myself because it is so light. I do not even need a lantern it is so light outside. In these sentences, the word "light" is used as a: A:homophone B:homonyme C:synonym D:simile ...


PLEASE CORRECT THE ANSWERS ACCORDING TO THE QUESTION BELOW. insert the prepositions in the following sentences : 1) he was christened Stephen UNDER his father,buthe answer IN the name of George. 2)He has not been heard since for years no one knows what has become to him. 3)do ...

algebra 1

in the equation 5x+y=-1,m= I will be happy to critique your work on this. Please note that we don't do students' homework for them. Once YOU have come up with attempts to answer YOUR questions, please re-post and let us know what you think. Then someone here will be happy to ...

7th grade Math

I have two questions for math. How do I add/subtract an integer Please give me full notes, or webpage please. Also, my teacher said 10-20E (Problems in book we have to do) Is that evens? because the odd answers are in the back of the text book Thanks,


Can someone please give me a link for a website or websites that provide shsat student handbooks-other than 2011-2012 and 2010-2011. thank soo much in advance i only have a few more weeks to study and have no resouces please.


I need help please help me. There's a chart that has to have 16boxes. It has to be 4 by 4. Lable boxes that are vertical top to bottom 1,2,3,4 and boxes that are horizontal left to right A,B,C,D. Box 1A has to be 28,Box 1C has to be 34, box 2C has to be 24, and box 2D has to ...


Please Help!!! I am having a small Problem Working this Problem. I am just not understanding. Could someone please assist? The lifetime of a brand of DVD player follows a normal distribution with a mean of 8 years and a standard deviation of 6 months. Find the probability that...

Corporate Fiance

Given an annual lease payment of $438,020 find the rate of return earned by the lessor on a 3 year, $1 million (present value) capital lease. Please don't show me how to solve this by using a financial calculator!! Please show me step by step how to do this.thanks

trig 30

Please help I need to solve the following question for x, where 0<x<2pi. and then write a general solution for the equation. The question is 2cos^2 x + cos x =1. I need to solve this using radian measurement. I solved it using algebra and was told I wasn't allowed. Could...

Trig Help

Prove the following: [1+sinx]/[1+cscx]=tanx/secx =[1+sinx]/[1+1/sinx] =[1+sinx]/[(sinx+1)/sinx] =[1+sinx]*[sinx/(sinx+1)] =[sinx+sin^2x]/[sinx+1] =[sinx+(1-cos^2x)]/[sinx+1] =??? This is where I'm stuck. Can someone help me. Please check what I got is right so far it's ...


Can someone please explain what factors affect a country GDP? Also, if Thailand has a GDP of 4.5% and Australia has a GDP of 2.8%, please explain which country has a better economy. Thanks for your help

Algebra-Please help me!

Hi, I'm totally stuck! Problem: sqrt(x-3) = sqrt (2) -sqrt(x) I know I square them to get them out of square roots but after that I'm stuck- answers: -25/8 25/8 no solution 1/8 Please show me how its done Thank you

Organic chemistry

please help me with these what are the functional group(s) in Lexiva (Fosamprenavir Calcium)? i only know that it has an amine group but i'm not sure if there is another group!!! and how can i relate Lexiva to chemistry?(ideas please)


Give the three general forms for: a) the reciprocal of a linear function b) the reciprocal of a quadratic function c) a rational function Please give me in a full details for each please...


Calculate molarity of HNO3 please help? Calculate molarity of HNO3 prepared by dissolving 22.3 grams of HNO3 in water to make 875 ml of solution... Please help I'm stuck


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