physics please HELP !
130,975 results, page 47

Math Help Please ASAP Connections
Write a ratio and a percent for the shaded area. a 6 x 6 grid with 12 shaded cells. a. 3/10, 27% b. 1/2, 50% c. 1/3, 33.33% d. 3/10, 30% Please help Lesson 11 Connections Academy Percents Unit Test im stuck 
ALL STUDENTS, PLEASE READ
Please remember these things: 1. This is a homework help website; please put your subject (math, science, English, or ??) in the subject line to make it faster for each teacher to find those questions in his/her areas. Even better is if you put your specific subject, such as "... 
Phsyics Plz Help
How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical energy in the ... 
Physics Help Please
A horizontal spring with a spring constant of 200.0 N/m is compressed 25.0 cm and used to launch a 3.00 kg block across a frictionless surface. After the block travels some distance, the block goes up a 32 degree incline that has a coefficient of friction of 0.25 between the ... 
Physics  Can you plz help!
a) a flashlamp bulb is marked '2.5V,0.30A' and has to be operated from a dry battery of e.m.f 3.0V for the current p.d. of 2.5V to be produced across it. Why? b) ow much heat and light energy is produced by a 100W electric lamp in 5 minutes? c) what is the resistance of a 240V... 
Physics
I have performed an experiment of simple harmonic motion and the values I got Mass(g)Distance (m) 200 0.438 250 0.398 300 0.345 350 0.312 400 0.297 450 0.281 500 0.259 I would like to know how to calculate the spring constant... since I have been having weird values, if ... 
physics
If the car has a mass of 0.4 kg, the ratio of height to width of the ramp is 13/125, the initial displacement is 1.9 m, and the change in momentum is 0.87 kg*m/s, how far will it coast back up the ramp before changing directions? tinypic(dot)com(slant)r(slant)10dunx3/7 I get .... 
Physics
A football is kicked off with an initial speed of 63 ft/s at a projection angle of 45 degrees. A receiver on the goal line 67 yd away in the direction of the kick starts running to meet the ball at that instant. What must be his minimum speed (in feet/second) if he is to catch... 
Physics Help Please
a) On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? b) On the same conveyor belt as described in problem a), the part ... 
please help physics!!!!
Two dynamics carts are placed end to end. Cart 1 (1.2 kg) is stuck to cart 2 (1.8 kg). Cart 1 is pushed with a force of 18.9 N (west),causing cart 1 to push cart 2 forward. Ignore the force of friction. Calculate the acceleration of each cart Calculate the force that cart 1 ... 
physics help me please
The pressure at the bottom of a glass filled with water (ρ = 1000 kg/m3) is P. The water is poured out and the glass is filled with mercury (ρ = 13.6 ✕ 103 kg/m3). The pressure at the bottom of the glass is now which of the following? a)equal to P b)smaller ... 
Chemistry
Following question I need help with part b) Please verify my answer for part a) too if possible. Consider the following reaction for silver tarnishing: 3Ag2S(s) + 2Al(s) > 6Ag(s) + Al2S3(s) a. State the oxidation number for each element in the reaction. 3Ag2S(s) + 2Al(s... 
Physics (Please)
I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved but then when ... 
physics. please help
A worker pushes a 820 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic frictin between the crate and the floor is 0.22. a) How much work is done by the worker on the crate? b) How much work is done by the floor? c) What is the net ... 
physicsplease help
When only the front wheels of an automobile are on a platform scale, the scale balances at 7.8 kN; when only the rear wheels are on the scale, it balances at 5.5 kN. What is the weight of the automobile? How far is its center of mass behind the front axle? (The distance ... 
Physical Science
Objects accelerated to relativistic speeds....live shorter or grow bigger? Please note that we don't do students' homework for them. Once YOU have attempted to come up with a response to YOUR questions, please repost and let us know what you think. Then someone here will be ... 
english
i need help writing a "i am" metaphor poem. The format is 10 lines of I am metaphors and the 11th line is what you are like i am annoying or i am blonde or something. PLease help it is due tomorrow! Someone here will be happy to give you feedback on what you write. Please ... 
7th grade
My textbook question is: Please look at page 38, Figure 2.6: "How do historians know Cartier traveled these particular routes? Where might they have found supporting historical evidence. The picture is just a map with the guys travels. (arrows and lines ect) Please help! 
science
How ionising radiation affect the cell, DNA and can lead to tumours /leukaemia? nothing too complex please note form will be fine, in which I can use it in my explanation. if you can please put it in your own words as I find it much easier to understand and explain in my ... 
SCIENCE
How ionising radiation affect the cell, DNA and can lead to tumours /leukaemia? nothing too complex please note form will be fine, in which I can use it in my explanation. if you can please put it in your own words as I find it much easier to understand and explain in my ... 
Language Arts
which of the following citations in a work cited page uses proper MLA style Please help do today! the examples are Paul, Smith. The Night on the river. New York: Penguin 1987.Print please write it out for me how it should look thanks. 
Math  Please Check My Answers
Please help me with the following two problems: Find the greatest possible error for each measurement. 512 m A. 0.5 m C. 0.5 cm B. 5 m D. .005 cm I think the answer is A. Is this correct? Find the greatest possible error for the given measurement if it is to the nearest 10 ... 
Physics
I got a few questions that I need to be checked please? Why does a brick weigh 1 kilogram. Explain. Would it be cause there are not other forces acting on it that's why it weighs 1 kilogram? Why do lurch foward when a bus slows down? What law is this? Is it because the bus ... 
PHYSICS 1
When a pitcher throws a curve ball, the ball is given a fairly rapid spin. A 0.15 kg baseball with a radius of 3.7 cm is thrown with a linear speed of 41 m/s and an angular speed of 37 rad/s. Assume that the ball is a uniform, solid sphere. (b) Calculate how much of its ... 
Physics
A driver has 50kg mass, and drives from a high board. On entering the water the driver travels vertically downward and comes to rest in a vertical distance of 5 m. The average resistance force is acting on the driver during the motion to rest in the water is three times her ... 
physics please help
A 65 kg bungee jumper leaps from a bridge. She is tied to a bungee cord that is 11m long when unstretched, and falls a total of 30m . Part a) Calculate the spring constant of the bungee cord assuming Hooke's law applies. part b)Calculate the maximum acceleration she ... 
College Physics PLEASE HELP
A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum acceleration of the mass, d... 
college physics
If I travel to Mexico and buy a 55g gold braclet for 20 dollars and take the braclet and submerge it in water starting out with 50cc and after it is submerged in the water it is 52.8cc. What is the buoyant force on the braclet? I also need to know if the braclet is real gold. ... 
Physics
5. If a wave has a wavelength of 20m and a speed of 100 m/s, what is the period of the oscillation? v = wavelength / period 100 = 20 / period 100*20 = periodperiod = 20 / 100 2000 s = period OR period = 20 / 100 period = 0.2 s I don't know which one is correct, please help?! 
physics help please
You want to use a windmill to generate electricity for your home. You decide to use Earths magnetic field which has a horizontal component B=10^4 T to an induce emf. You design a conduction loop with 200 turns and surface area of 0.1m^2. The rod is 0.5m wide. On the day you ... 
PHYSICS PLEASE HELP
A 60.8kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does 278 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the ... 
Chemistry
Hi, please can someone tell me if this is the right number of significant figures. 8.1 x 10 to the power of 3 would have 2 sig fig 910 would have 3 175.0 would have 3 please can some tell me if I've got this right Also how would I report each of the following measurements ... 
physics
There is a great deal of ice floating on the ocean near the north pole. If this ice were to melt due to global warming, what would happen to the level of the oceans? A.Rise B.Fall C.Remain the same water is slightly more dense than water, but when the ice melts it will have ... 
physicsplease help!
The total crosssectional area of the loadbearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.5 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 km/h in 4.2 ms. If the ... 
physics for scientists and engeneers I
A 0.145kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 43 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let the positive axis lie ... 
Physics check my answer please
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, much less than that of Earth. At −22°C (a warm day on Mars), what is the mass of one cubic meter of the atmosphere? (Assume the atmosphere is completely CO2.) I got 0.020... 
Physics
A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories: _________ The specific heat of the metal. cal/(g°C): ________ Hint: 1 mL water has a mass of 1... 
PHYSICS PLEASE HELP!
You need to open a heavy door that's 40 inches wide. Instinctively, you push near the edge that's the farthest from the hinges. If instead, you had pushed at a point only 10 inches in from the hinges, how much harder would you have had to push to open the door at the same ... 
Physics
A piston in a bicycle pump is pressured half way into the pump without letting air get out and at unchanged temperature. Inside diameter of the pump is 2,3 cm. a) What is the pressure inside the pump in atm? b) How much force is needed to hold the piston in this position? The ... 
Physics
Imagine a vessel containing 2.000 kg of liquid whose specific heat equals 1.50 kcal/kg/°c. Suposse that all of the liquid exists at its vaporization temperature of 450 k. We transfer 150 cal of heat energy to the liquid. What is the temperature of the liquid in the vessel ... 
Physics Please Help!!
Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = w2) and the surfaces are... 
Physics
Please help. To cool a hot bath containing 50L of water at 50 degrees Celsius down to 20degrees Celsius, what volume of cold water at 5 degrees Celsius would be needed? (in litres) and what mass of ice at 0 degrees celcius would be needed? i'm thinking about using q=mcdeltaT ... 
physics..help PLEASE!
A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 35 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ... 
PHYSICS
A crate of potatoes of mass 23.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.65 and μk = 0.44. Find the frictional force (magnitude and direction) on the crate if the crate is at rest. Please help with ... 
Physics
A sheet of siding has a centrallylocated doorway of width 2.0 m and height 6.0 m cut out of it. The sheet, with the doorway hole, has a mass of 264 kg. (a) What is the x coordinate of the center of mass? (b) What is the y coordinate of the center of mass? Assume the lower ... 
physics
A car is moving at 53 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 102 miles per hour? Answer in units of J HELP!!!! I've tried doing (5*10 J)* (102/53)^2 and I keep on getting it wrong PLEASE HELP ME ... 
Physics
62kg person in an elevator is moving up at a constant speed of 4.0m/s for 5.0s a) calculate the work done by the normal force on the person. b) calculate the work done by the force of gravity on the person . c) How would your answer change if the elevator were moving down at 4... 
physics help 4 please!
A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? ? rad/s b.) What is the rotational KE of the disk? ? J c.) What is the total KE of the disk? ? J d.) The disk then rolls up a hill... 
Physics
An ideal spring hangs vertically from the ceiling. When a 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the ... 
Physics
While visiting Planet Physics, you toss a rock straight up at 15 and catch it 2.4 later. While you visit the surface, your cruise ship orbits at an altitude equal to the planet's radius every 240 min . What is the mass of Planet Physics? Express your answer using two ... 
physics help please
Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one speaker as the origin and ... 
PhysicsPlease help
I need a little direction with this question:If someone could provide the correct formula, I think I divide each reistor by 12V but I'm not sure. To find total resistance, do I just add the reciprocals? Three resistors connected in parallel have individual values of 4.0, 6.0 ... 
Health please check my answer
Please check my answer thanks The radiologist is able to evaluate the movement of body organs by doing what procedure A. Ultrasound B. MRI C. Film survey D. Fluroscopic exam I picked A 
Algebra......Help Quick!!
12a^3bc18a^2bc^2+6a^2c, x^2+20x+36, 12x^48x^34x^2, x^2+36x, 9x^2+6x+1, 6x^3+11x10, x^2+3x6..............can someone please help me solve some of these problems if not all. I have forgotten how to solve them can someone please help..Thanks 
Math
1)Solve sin2x=3cosx for all values of x. What do I need to do? 2)Solve e(sqrtx)=4 3)Approximate the greatest real root of f(x)=x^32x5 to the nearest tenth. I just need help not do for me. HELP. Please and Thank you. Explain please no links. 
Science Chemistry
Could someone please explain a few things? First off, how do you change a normal compound or element and change it to an ion? And second, could you please explain the net ionic equations? 
Algebra 1: 8th Grade
Simplify each expression. Write your answers using positive exponents. Check Answers Please: 1) 2^3*2^4 = 2^7 2)10^6/10^9 = 1/10^3 3)3^5*3^1 = 3^6 4)5^7*5^4 = 5^3 5)9^3/9^10 = 9^13 6) 4^11/4^8*4^2 = 4^5 7) a^2*a^3 = a^5 8)b^9/b^4 = 1/b^13 9)c^5*c^2 = 1/c^7 11)(5d^4)(8d^6... 
Math
help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx  2x^(2) dy = 0 ;y = e, x = e 3.) y( x^(2) + ... 
Grammar and Composition
can someone please help me by giving me suggestions for a topic,for my Descriptive Essay it can be about anything; that can be described please give me some suggestions. because i'm not sure what to write on, and i'm going to be asking for help a lot in the essay too. 
grade 10 math
im stuck in this question,i tried everything but i failed... can u please help me. find two numbers whose sum is 32 and whose product is a maximum. please help me!!! No one has answered this question yet. 
please please help
Nico is saving money for his college education. He invest some money at 8%, and $1300 less than that amount at 5%. the investments produced a total of $234 intrest in 1 yr.How much did he invest at each rate? 
Calc. Help Please.
Find the value of the definite integral using sums, not antiderivatives: int= integral sign int((x + 2)/(x^(3/2)),x= 16..25)dx Please help... even just showing me how to get started would be greatly appreciated. 
math
What unit of measurement would be used to measure around a playground and why? I think either yards or feet. Leaning toward yards but don't know why, please help. Or feet because of greater distance I rally don't know. Help please! 
Mathplease help!!
Normally, the first 3 key points of a sine curve are (0,0), (90,1), and (180,0). If the function is changed to y=2sin(3x120)+5, the key points given above change to... Please explain this to me so that I can do it myself. 
CHEM AP please help!!
Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of the following. a 1.32mg mosquito moving at a speed of 1.61 m/s if the speed is known to within ± 0.01 m/s i tried every way and still cant get it..please someone help 
Math  Trig please help!
State two intervals in which the function y=7sin(1/5x)+2 has an average rate of change that is: a) zero b)a negative value c)a positive value Please explain how to get the intervals! Thanks a lot in advance! 
Math(Please, please help)
1/[N2O] = 1/(1.75M) + (1.10E3M^1 S^1)(1852s) [N2O] = 0.383 M I know I posted a similar question but I am having trouble with this one as well. Should I do 1/1.75 first and then add 1.10e3 and then multiply by 1852? 
chemistry(PLease Help)
An aqueous solution contains 0.223 M carbonic acid and 0.112 M hydrobromic acid. Calculate the carbonate ion concentration in this solution. [CO32] = mol/L. Can you please help me how to solve this problem? 
Chemistry(Please, please help)
I am trying to draw a constitutional isomer for the compound CH3CH=CHCH3 but I am having some trouble. HCC=CCH I drew the first compound like this with more hydrogens on the Cs. How could I draw another strucutre? 
MATH FIFTH GRADE MATH!!!!!!!!!!!!!!!!!!
WHICH DATA LANDMARK BEST REPRESENTS THE NUMBER OF HOURS A TYPICAL STUDENT WATCHES TV THE MEAN, MEDIAN, OR MODE wHY????????????_____________________________________________________________________________________________________________________________ ... 
college algebraplease help
Form a polynomial f(x) with real coefficients having the given degree and zeros. degrees 5; zeros 1; i; 7+i please show all work. I am having a hard time understanding this. 
college algebraI really need help!!
solve the following exponential equation. exact answers only. 19x 2x 2 = e I hope that you understand this question. I don't and need some help please. Can you show all answers please. 
Help triangle angles!
Points D, E, and F are the midpoints of sides BC, CA, and AB of ABC, respectively, and CZ is an altitude of the triangle. If <BAC=71, <ABC=39, and <BCA=70, then what is <EZD+<EFD in degrees? Please help I tried making a picture but its not helping....please help! 
Algebrahelp please
I already asked this question once about the absolute value of 3x2=8 and absolute vale x+1=1....value of x?...and the answer I received was does 0 or 2 satisfy both ....they dont...so is it no solution? Please help  I do not understand this problem....Thanks 
math help please urgent
the difference of two numbers is 27. the first number is equal to one more than twice the value of the second number. find both numbers. please show work. 
math please help
Anneke's science class measured 10 inches of rainfall during the month of May what was the average rainfall per day?(Round your answer to the nearest hundredth.) Please answer and explain. 
Math Help
could someone please give me an example not an example using coins, marbles, spinner, like something different that would explain the difference b/w theoretical and experimental probability. And please explain. 
algebra
x + 5 = 18 5 or 5 13 or 13*** y + 4 < 1 5 < y < 3 3 < y < 5***? 4 < y < 1***? 1 < y < 4 2t  5 = 7 t = 1 or 1 t = 6 or 6*** t = 10 or 10 t = 12 or 12 a 3/4 = 5/8 1/8 or 1/8 7/8 or 7/8 1 3/8 or 1 3/8 no solution Please help!? ... 
Chemistry
What materials would be produced in the electrolysis of the following reagents? Please make sure that you correctly balance the equations! Also, please note the states of the reagents. NaCl (aq) > NaCl (l) > KBr (l) > 
prealgebra
please help me to find the least possible consecutive odd integers such as that eight times the smaller one is at least 25 more than the difference of the two integers. I don't remember my teacher teaching this so please help me. 
Please Proofread my Essay
I've made plenty of changes to my essay. Could you please proofread it? Thanks! Is Beauty Really Skin Deep? 
ALGEBRA HELP NEEDED PLEASE!
Please see the Algebra post on the current question page. Help still needed and appreciated thank you 
algebra please help Dr.Bob
please Dr.Bob answer this for me...i have to got bed soon...i really need to know the answer!! 
English
1. Can I say who is calling please? 2. Who's calling please? (telephone conversation) Are both the same? What is the meaning of 'say' in #1? Does it mean 'ask'? 
Math Approximation to find greater fractions
Which fraction is greater ?? 13/30 or 25/41 Please use approximation and please explain answer!! 
Math 10 xintersept yintersept
Please help me with this question Q:For each line,determine the xintersept,the yintersept,and the slope a) 2x5y+10=0 b)4x+y12=0 please explain carefully , I'm dumb... thank you 
precalc. please help:)
(square root y3)^2=(1square root 2y4)^2. how do i do this???? i am clueless, pleaseeee help!!!! i^7. how do I do this please describe! thanks for your time and help, I really appreciate it:) 
Englishhelp please
Could someone please take a moment to take a look at my previous post on English. Thank you very much:) 
Calculus Please Help
Find k for which the limit below exists, and find the limit. lim x>1 (2x^2 + kx +4)/(x1) Please show me how to do both procedures. Thanks 
math 140
I have two questions posted that has not been answered please help. The questions were posted on March 18 please help. 
geometry A please help
given <A compl to <B <C is compl to <B <A=(3x+y) <B=(x+4y+2) <C=(3y3) find the measure of all 3 angles show all work please I don't know how to do it thank yu 
Earth Science
20. Contrast point source pollution and nonpoint source pollution. Can someone help me please?!?!?! Asap please?!?!?!?! 
maths(PLEASE HELP!)
The mass of a 10p coin is 6.5g find the mass in kilograms of the coins in a £10 bag of 10p. Answer please:????????? 
PHYICS URGENT URGENT PLEASE PLEASE PLEASE HELP ME!
A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the numerical values of ... 
physics
Im having severe trouble understanding the concept of Dimensions. And with 300 other students in my physics class the Professor doens't have alot of time for individual students.... The volume of a liquid flowing per second is called the volume flow rate Q and has the ... 
someone please help me.  Precalc
Rewrite the expression tan(90°−θ)sinθ as one of the six trigonometric functions of acute angle thetaθ. Please show work + answer. I have a few of them to do. Thanks. 
physics please help
Find Beta and Gamma for an electron that has a kinetic energy of 6.00 keV. gamma = KE/MoC^2 + 1 Beta = 1/gamma^2 + 1 gamma = 1.011723381 Beta = 1.9769592 I am getting gamma right but I am getting Beta wrong what I'm I doing wrong?? 
physics please help!!
In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps and it is obviously desirable that this not be too difficult. The engineer has done a survey and found that almost no ... 
physics
A magnetic field has a magnitude of 1.20 103 T, and an electric field has a magnitude of 5.50 103 N/C. Both fields point in the same direction. A positive 1.8µC charge moves at a speed of 2.60 106 m/s in a direction that is perpendicular to both fields. Determine the ... 
AP PHYSICS PLEASE HELP
A spherical surface has a radious of .150 meters. A charge of +85.0 uC is placed on the sphere. A. decribe what happens to the electric potential of a 5.0 pC charge that is moved from a very far distance from the sphere to a point 0.100 meters away from the sphere. B. Decribe...