physics please HELP !
130,975 results, page 60

Physics
I studied the equation of time recently and understand the Earths keplerian orbit is responsible for it. I understand the keplerian orbit described the Earths elliptical path and it was this alone that created the equation of time. I have just read that the Earth does not ... 
Physics
A child is twirling a 0.0116 kg ball on a string in a horizontal circle whose radius is 0.102 m. The ball travels once around the circle in 0.560 s. (a) Determine the centripetal force acting on the ball. N (b) If the speed is doubled, does the centripetal force double? yes no... 
Physics
A child is twirling a 0.0116 kg ball on a string in a horizontal circle whose radius is 0.102 m. The ball travels once around the circle in 0.560 s. (a) Determine the centripetal force acting on the ball. N (b) If the speed is doubled, does the centripetal force double? yes no... 
physics Classical Mechanics
Hi, Greco. I am using the following formula to solve Ballistic Missile: sqrt(5*G*m_1/4*r_1). Given the following: m_1=5*10^24kg; r_1=6000;alpha=30 degrees;r_2=(5/2)r_1; G= 6.674*10^11kg/m^3s^2. I thought I did it correctly using the proper formula. My answer was incorrect. I... 
physics
A 0.700kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What is the... 
physics
A 0.700kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What is the... 
college physics
If a girl drops a coin into a wishing well. After exactly 5 seconds she hears it splash into the water. How fast was the coin going after 1 second? After 2 seconds? How fast was the coin going when it hit the water? How far down is the water? Could you please help with the ... 
physics help 2 please!
The air inside a hot air balloon has an average temperature of 84.3°C. The outside air has a temperature of 15.3°C. What is the ratio of the density of air in the balloon to the density of air in the surrounding atmosphere? inside / outside = ?? 
Physics
A block of mass 50 kg is pulled on a frictionless floor by F=210N directed to 30angle horizontally, If the block moves 3m, find work done? a. 115 √2J b. 315 √3J Answer is B 315 √3J , my question is how to solve it in this way i mean, i solved it like this, w=... 
Physics(Please help, thank you)
1) A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 71 kg, and the height of the water slide is 12.0 m. If the kinetic frictional force does 7.4 × 10^3 J of ... 
physics
A closed box is filled with dry ice at a temperature of 78.5 degree C, while the outside temperature is 21.0 degree C. The box is cubical, measuring 0.350m on a side, and the thickness of the walls is 3.00*10^2 m. In one day, 3.10*10^6 J of heat is conducted through the six ... 
physics
Suppose a cylindrical habitat in space 7.70 km in diameter and 25.0 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. They would all be held in place by rotation of the cylinder about its long ... 
Physics Work
A worker pushes a 1.50*10^3 N crate with a horizontal force of 345 N a distance of 24.0 m. Assume the coefficient of kinetic friction between the crate and the floor is 0.220. a. How much work is done by the worker on the crate? b. How much work is done by the floor on the ... 
Physics
On a spacecraft, two engines are turned on for 666 s at a moment when the velocity of the craft has x and y components of velocity V0x = 3485 m/s and V0y = 5690 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 4.48 * 10^6 m and y... 
Physics
A spring fixed to a wall is attached to a 6 kg block of wood on the other end. The block rests on a frictionless surface. The spring with spring constant 100 N/m is compressed by 0.1 m and releases. With what frequency and period will the block/spring system oscillate? I drew... 
MATH/CHEM PLEASE HELP!
Give the answer to the following calculation with the correct number of significant digits. Report your answer in scientific notation. (6.17 x 101 + 4.9 x 102) x (3.95 x 102 + 6.454 x 103) i know how to solve for the answer, i just don't know the correct number of sig figs... 
JAVA PROGRAMMING
"POWERS" Compute the power of a number given the base and exponent. Do three versions of this program using a while loop, a dowhile loop and a forloop. Introduction Please help..i don't know how to input this in java...please help.tnx 
calculus
I have two questions please. 1. find an equation for the line with the given properties. Express in slopeinntercept form. 2. find the equation of a line that is perpendicular to the line y=1/2x+4 and contains the point (3,0) please show work 
calculus
I have two questions please. 1. find an equation for the line with the given properties. Express in slopeinntercept form. 2. find the equation of a line that is perpendicular to the line y=1/2x+4 and contains the point (3,0) please show work 
5TH GRADE MATH PLEASE HELP
Draw an equation or function table. The cost of shipping mittens purchased online is $2 plus $6 for each of pair of mittens. What is the total cost of buying 5 pairs? P = pair of mittens. Can you please help me with this problem? 
Physics
If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it will oscillate. If it is displaced a distance 0.130 m from its equilibrium position and released with zero initial speed. Then after a time 0.803 s its displacement is ... 
physics
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 ... 
physics
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 ... 
PHYSICS (CHECK WORK)
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^... 
physics
A metal container, which has a mass of 9.4 kg contains 14.2 kg of water. A 1.7kg 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 ... 
Physics
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 ... 
physics
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 ... 
egypt
can any one please tell me info about egypt like about cario...... because i need tomake a leaflet about egypt please help me..... 
SciencePlease Help
I've got to describe homologeous chromosomes in terms of the type and # of genes that they possess. How would I describe that? The genes on one of the chromosomes in the pair correspond to the genes on the other chromosome in the pair. (Have I done this correctly? I'm not ... 
Geometry
Please Please HELP!!!! I need the answer to this and i've worked it out but I don't know if it is correct... Please check my answer!!!! The polygons are regular polygons. Find the area of the shaded region to the nearest tenth. I can't post a picture of it but it shows a ... 
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) ... 
Math
I don't remember sampling methods... i do know that there are three and one of them is litteraly called 'random'. if i can please be reminded of the methods i can finish the last 3 problems of my math.... i don't like math especially if you have a field reading test for the ... 
English 7 Help!  please read
In the second paragraph the author writes "Of all the things for which Jamie held a soft spot in her heart, the tree house was perhaps the dearest". What does the phrase "soft spot" mean in this sentence? My Answer  the part that is soft.... ok im having trouble in this ... 
pre calc
The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? Please help I got 670,422 and the computer marked it round i then tried rounding it to 671000 but it was still ... 
Algrebra IIplease check my answer
Determine the zeros of the function 7x^2 + 9x = 0 answers were: {9/7} {9/7,0} {o,9/7} {9/7} I think the answer is {9/7,0} but I'm not positive when I worked itIf this is wrong please steer me into the correct calcs because then I don't what I'm doing wrong 2.Solution to ... 
7th grade math Ms.Sue help please
4. What is the distance between Nicholas’s school(3,2)and the post office (2,2)? 6.4 5.2 3.6 3.0 5. If Nicholas is located at (– 3 , 2), what is the distance to get to the grocery store (1,1)? 2 3 4 5 I have no idea how to solve these i have tried the Pythagorean ... 
business plan
Please respond I did review the information you gave me and I was told to anwer this question. can you please respond with your assistance how to answer this question. How can I clearly state sound reasons that my services are currently viable and how I will react to future ... 
physics
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... 
Physics
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? 
Physics
would it be possible to view your body from headtotoe, 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 
Physics
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
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
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 onehalf of a revolution. How much time does this maneuver take? Divide 0.5 revolutions by the average angular ... 
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!!! 
geometry
I'm stuck on this question please help. "GK bisects angle FGH". If angle FGK=8v2 and angle KGH=3v+3,find angle FGH. PLEASE HELP ME 
HELP ME PLEASE & FAST!!!!!!!!!
Hi, I need help. Does desertification come from Ancient China or Ancient Africa? Please I really need the help fast. Thanks so much! 
Math PLEASE HELP ASAP
Hi, Can someone please help me on this question. From midnight to 6:00 am, the temperture rose 8 degrees C. at 6:00 am the temperature was 20 degrees C. what was the temperature at midnight? Thanks :) 
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)(ToTf)//MiCwTf 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 lowmass 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 ... 
PHYSICS
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 ... 
Physics
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 ... 
English
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 ... 
Physics
You want to push a 66kg 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, ... 
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 ... 
PreAlgebra 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 
PHYSICS  ONE MORE QUICK QUESTION
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... 
geometry PLEASE
imageshack(.)(us)/photo/myimages/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. ... 
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... 
Math
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... 
math
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) ... 
Math
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) ... 
Socials
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 
Chemistry
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 
Algebra
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
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 ... 
PHYSICS
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 ... 
physics
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
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 ... 
physics
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 ... 
Physic please check
A person stands 4.2 m in front of a wall that is covered floortoceiling 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 ... 
Physics _ Please please help
The crosssectional area of the Utube 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 Utube is connected to a pipe in which a constant gas ... 
Physics
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 12volts battery is rated according to "amperehrs". A 70Amperehour battery for example, at a discharge rate of 3.5Ampere has a life of 20 hrs. Questions: a.) assuming the voltage remains constant, obtain the energy and power delivered. b.) Repeat for a ... 
chemistry
Please can someone help me before i pull all my hair out i've been struggling with this for about a week CH2=CHCHOH ________' _______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 ... 
English
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 ... 
english
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 ... 
social studies
Please explain how members of the Reagan administration acted illegally to sell arms to Iran and aid the Contras in Nicaragua. In a small paragraph, please give reasons for and against these actions, and evaluate their impact. this is the question that I'm stumped on. if you ... 
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 "... 
physics
please check: A battery converts what type of energy into electrical energy? a. mechanical b. nuclear c. solar d. chemical D When a parallelplate capacitor is connected to a battery:a____ is stored on one plate, and a ___ is stored on the other a. negative charge, positive ... 
physics
a uranium238 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 thorium234 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 doubleslit 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 ... 
Physics A level
EXAM STYLE QUESTION An aircraft is at rest at one end of a runway with its engine idling. The runway is 2.2km long. The aircraft then accelerates along the runway at an acceleration of 2.5ms2 until it reaches its take off speed of 75ms1 a)Calculate: i)the time taken for the ... 
Physics
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 xaxis. Vector B has magnitude 3.0m and direction 250 degrees relative to the positive xaxis. 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/algebra
Subtract: express your answer in simplest form. 2/5  y/y2 answers a)3y2/y2 b) 3y 2/5(42) c) 3y4/5(y2) d) 3y4/y2 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... 
physics
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 ... 
physics
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 (...