physics please HELP !

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Physics

Please check these answers[my letter choice is in CAPS]: 1. In the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses? A. interpreting results b. stating conclusions c. conducting experiments d. making observations and ...

Medical Physics

A block is acted on by a force that varies as (2.8*10^4 N/m)x for 0<=x<=.21m, and then remains constant at 5880 N for larger x. 1. How much work does the force do on the block in moving it from x = 0 to x = 0.30 {m}? 2. How much work does the force do on the block in ...

Physics.

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

Physics Please help!

the coefficient of static friction between the coffee cup and the roof of a car is 0.28, If the maximum acceleration the car can have without causing a cup of coffee (on the top of the car) to slide is 2.7 m/s^. What is the smallest amount of time in which the person can ...

Physics Please help!

the coefficient of static friction between the coffee cup and the roof of a car is 0.28, If the maximum acceleration the car can have without causing a cup of coffee (on the top of the car) to slide is 2.7 m/s^. What is the smallest amount of time in which the person can ...

Physics- Elena please help!!!!

A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...

physics

a grandfather clock is designed to have a pendulum which swings a mass at the end of the chain in a horizontal circular motion. the pendulum is designed to swing 7 degrees off of the vertical. the chain is 1.50 meters long and the maximum tension in the chain is 12.0 N. ...

Physics

For the object in the preceding problem, what magnitude torque is necessary to give the object an angular acceleration of 1.5 rad/s^2 a) along the x-axis? b) along the y-axis? c) along the z-axis (perpendicular to the page, passing through the origin)? Help please! Use the ...

Physics

A horizontal spring(k= 86.2 N/m) is placed on a countertop and is compressed a distance of 36.3 cm. A 103.5 g object is placed at the end of the spring. The coefficient of kinetic friction between the object and countertop is measured to be .47. What acceleration will the ...

physics

physics - asa, Tuesday, September 18, 2012 at 1:25pm can yu help me thanks in advanec. imageshack . us /photo/ my-images//593/questionpb.png/

physics

A coin is placced 12.0 cm from the axis of a roatating turntable of variable speed. When the speed of the turntable is slowly incraeased, the coin remains fixed on the turntable until a rate of 50 mph is reached at which point the coin slides off. What is the coefficent of ...

Physics

A block of mass m lies on a rough plane which is inclined at an angle è to the horizontal. The coefficient of static friction between the block and the plane is ì. A force of magnitude P is now applied to the block in a horizontal direction, towards the plane. Show that the ...

Science Physics

Ms. Sue could you please explain this to me. Imagine you need to deliver a piano over three steps. A longer ramp translates into less force necessary to raise the piano's height than a shorter ramp would require. Calculate the percentage smaller a force would be required using...

Physics Urgent please help

A figure skater stands on one spot on the ice(assumed frictionless) and spins around with her arms extended. When she pulls in her arms, her moment of inertia decreases to 3/4 of the initial value. Assume that her spin angular momentum is conserved. What is the ratio of her ...

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 ...

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...

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 re-post 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 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 ...

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 - 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...

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 ...

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 ...

physics--please 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 ...

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 60.8-kg 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 non-conservative. The final speed of the ...

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 ...

physics-please help!

The total cross-sectional area of the load-bearing 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 0.145-kg 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 ...

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^3bc-18a^2bc^2+6a^2c, x^2+20x+36, 12x^4-8x^3-4x^2, x^2+36x, 9x^2+6x+1, 6x^3+11x-10, x^2+3x-6..............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^3-2x-5 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!

Math-please 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(3x-120)+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 1.32-mg 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) + (1.10E-3M^-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 1.10e-3 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. H-C-C=C-C-H 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 algebra--please 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 algebra--I really need help!!

solve the following exponential equation. exact answers only. 1-9x 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!

Algebra-help please

I already asked this question once about the absolute value of 3x-2=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) -->

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 centrally-located 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...

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 x-intersept y-intersept

Please help me with this question Q:For each line,determine the x-intersept,the y-intersept,and the slope a) 2x-5y+10=0 b)4x+y-12=0 please explain carefully , I'm dumb... thank you

precalc. please help:)

(square root y-3)^2=(1-square root 2y-4)^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:)

English-help 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)/(x-1) 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=(3y-3) 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:?????????

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...

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