physics please HELP !
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physics
A physics professor lifts her 9.0kg briefcase at constant speed with an upward force. Find the magnitude of her force. 
physics
A physics professor lifts her 9.0kg briefcase at constant speed with an upward force. Find the magnitude of her force. 
physics
A physics professor lifts her 9.0kg briefcase at constant speed with an upward force. Find the magnitude of her force. 
English
1. Please call me at 1234567. 2. Please call at 1234567. 3. Please call 1234567. 4. Please dial me at 1234567. 5. Please dial at 1234567. 6. Please dial 1234567. (Which ones are not grammatical? Which ones are grammatical? Thank you.) 
PHYSICS
I don't know where to start solving this question. Please help! A 320 kg piano slides 3.7 m down a 32 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.39. Calculate the ... 
PHYSICS PLEASE HELP !!!!!
A roller coaster cart with a mass of 13 kg travels around two frictionless, circular loops. It just barely makes it around the top of the first circular loop which has a radius of 24 meters. It then travels around the other loop with a radius of 14 meters. What is the normal ... 
physics
light travels from ethanol intro crown glass. what's the brewster angle in this situation? illustrate your answer with a light ray diagram. what's the signifcance of this angle of incidence? n1=1.36for ethanol nR=1.52 for crown glass tanangleB=nR/ni =1.52/1.36 =1.12 (48.2 ... 
physics
The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics  bobpursley, Thursday, February 3, 2011 at... 
Physics 102
THIS IS A QUESTION IN MY PHYSICS BOOK & I REALLY REALLY NEED HELP. I AM 48YRS OF AGE JUST DECIDED TO GO BACK TO SCHOOL AND HONESTLY KNOW NOTHING ABOUT PHYSICS. Two facts: A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “drops” ... 
Physics(Please answer, thank you)
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values. Physics  drwls, Saturday, September 15, 2012 at 1:29am Define your terms. I have no idea what you are talking... 
Mat/117 DQ1
How do you know if a quadratic equation will have one, two, or no solutions?Please give examples. How do you find a quadratic equation if you are only given the solution? Please give an example.Is it possible to have different quadratic equations with the same solution? ... 
physics
A 3.30kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ... 
physics
A 3.30kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ... 
Physics
A jet pilot (80 kg) flies a loopdeloop at a constant speed of 600 m/s. a) What minimum radius can the loop have so that the centripetal acceleration is no more than 6ag? b) Suppose that the pilot just happened to be sitting on a spring scale while flying the jet. What will ... 
Physics
A jet pilot (80 kg) flies a loopdeloop at a constant speed of 600 m/s. a) What minimum radius can the loop have so that the centripetal acceleration is no more than 6ag? b) Suppose that the pilot just happened to be sitting on a spring scale while flying the jet. What will ... 
physics  additional info added
SEE ADDITIONAL INFO ADDED Using the motor principle explain why a motor is rotating in the direction indicated. I seriuosly have no idea, please help explain this theory to me. PHYSICS  drwls, Saturday, February 6, 2010 at 2:15pm To help you answer that question, I'd need a ... 
Health
Can you help me with this question? The determinant of total energy requirement that may most appropriately be manipulated in a weight loss program is: 1. basal matabolic rate 2. physical activity 3. dietary thermogenesis 4. body temperature Would the correct answer be #2 or #... 
Physics
At the instant a traffic light turns green, an automobile that has been waiting at an intersection starts moving forward with a constant acceleration of 2.00m/s(squared). At the same time a truck traveling with a constant speed of 18m/s, overtakes and passes the automobile. 1.... 
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. Late at night, the traffic flow is only 7 cars per minute. (b) What is the sound ... 
Psychology
difference between physiological and psychological needs. I am confused on this question I have been studing the Maslow's Hierarchy of Needs I am assuming this so If I am getting this wrong please explain to me the difference. The Maslow theory gave 5 needs they are at the ... 
Physics
A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it is connected across ... 
Physics
A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it is connected across ... 
physics
how many excess electrons must be placed on each of two small metal spheres placed 3.00 cm apart in a vacuum if the force of repulsion betwen the spheres is to be 0.000000008 N? how do i solve this problem??=( help please.thx. Use Coulomb's Law: F = k Q^2/R^2 The force is F = ... 
Physics(Please help)
The two strings have the same tension and mass per unit length, but they differ in length by 0.54 cm. The waves on the shorter string propagate with a speed of 41.7 m/s, and the fundamental frequency of the shorter string is 227 Hz. Determine the beat frequency produced by the... 
AP Physics
Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. The coefficient ... 
Science HELP PLEASE
I need to write a hypothesis for a lab ex. I think that ionic compounds will be soluble in water because the polar molecules in H20 cause the compound to break apart and dissolve in the water. but another part is the appearance of ionic and covalent compounds help please!! 
Math please check answer
please see if I am right thanks Mary bought four shirts for $ 22.00 each, a pants suit for $212.00 and dress shoes for $85.00 Her sales tax is 6 % what is the total of her bill ? $22 x 4 = $88.00 $88.00 $212.00 + $ 85.00  $ 385 x 0.6... 
world geo
An isthmus is a narrow strip of land located between two water bodies that connect two larger land areas.find a central american country that is an isthmus. i do not know how 2 answer this question:( please please help:) thank u 
spanish
please help: Mi padre trabaja por la noche. Por eso, se levanta por la noche y _____ por la mañana. a. se acuesta b. se peina c. se cepilla d. se viste i don't think i understand the question correctly? please explain it and the answer choices. 
Math
Determine the zeros of the function 3x^2 8=10x. I know I rewrite it as 3x^2 10x8 = 0 But then what do I doI'm totally confusedAnswers are {2,4} {2,4} {2/3,4} {2/3,4} Please direct me or show the steps, just don't give me the answer because I still won't get it.I think ... 
4th grade math
Please help advise if my answer is correct Is the solution of 25 + n = 30 greater or less than 30? Explain how you know without solving it? By looking at the equation, I know that the value of the n = would be 5. It is not greater or less. It should be equal. Please let me ... 
college algebra
Solve the following inequality. x^3+9x^2108 less or equal to 0. Then write your solution in interval notation. I am sooo confused and do not have any idea how to do this. Can someone please show me step by step please??? Thanks in advance. Someone who is confused. 
math
(1)Robert is thinking of two numbers. Their greatest common factor is 6. Their least common multiple is 36. One of the numbers is 12. What is the other number Answer: 18 please help Ms.Sue I think the answer is right not sure how I got it please explain or help!!! 
English III Freedom Writers
have you watched the movie Freedom Writer? can you please help me with my assignment? 1) consider the reasons why the groups have been used. 2) How this representations of different cultural groups are challenging or stereotypical? PLEASE HELP MEEE!!!!! 
History
Can someone please tell me the radical one between Alfred Young and Gordon Wood in the American Revolution? I believe it is Gordon Wood but when I search the internet it makes me think both were radical. Please direct me to a site. Thanks 
chemistry help~~~~ Please!!!
Sodium24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na is injected into an animal, how long can the study continue before only 1 μg is left? Show work please! 
computer science
Please , help me i don't know how to draw a flow chart , how it does..ang we given an ass. And i need an example to get others answer. Please illustrate to me the answer of this. Draw a flowchart to print the first N even positive integers and print the sum. 
Language
1. What is the term for the part of a story that sets up the story's ending? (1point) exposition conflict falling action (either this one) resolution (or this one) Please I need this to be correct. so please tell me how you found out that my answer was correct 
english help please!!
Has anyone read the War of the worlds? I need to make a topic sentence for either 1. Based on this chapter, what might be the author’s message or theme? or 2. How is H. G. Wells’ fictional world in War of the Worlds similar to the real world? Help me please :( 
math help me out please
There are two distinct natural numbers. Each is first increased by 10 then by same percentage as each was increased for the first time. Each number finally results in 72 Find the difference between the numbers. How to solve in easy way please help me 
Steve help please?!?!
How many moles of oxygen are produced from the decomposition of 36.7 g of dinitrogen pentoxide? 2N2O5 4NO2 + O2 A. 3.19 mol B. 0.340 mol C. 0.170 mol D. 5.44 mol Hi Steve, I posted this question the other day but really don't know how to answer it. Can you walk me through it ... 
Physics Problem; CONVERSIONS
PLEASE HELP ME SOLVE !!!! InMay 1998, forest fires in southernMexico and Guatemala spread smoke all the way to Austin. Those fires consumed forest land at a rate of 26900 acres/week. On the average, how many square meters of forest are burned down every minute? An acre is an ... 
Physics Problem; CONVERSIONS
PLEASE HELP ME SOLVE !!!! InMay 1998, forest fires in southernMexico and Guatemala spread smoke all the way to Austin. Those fires consumed forest land at a rate of 26900 acres/week. On the average, how many square meters of forest are burned down every minute? An acre is an ... 
Physics: Angular Width. Why is my answer wrong?
A beam of yellow laser light (590 nm) passes through a circular aperture of diameter 5.0 mm. What is the angular width of the central diffraction maximum formed on a screen? I can't seem to get this answer right. I don't think I am finding the first part of the problem ... 
Physics
1. Question: Consider two planets with uniform mass distributions. The mass density and the radius of planet 1 are p1 and R1, respectively, and those of planet 2 are p2 and R2. What is the ratio of their masses? Ans: M1/M2 = (p1/p2)(R1/R2)^3...I got this answer correct. I need... 
Math (PLEASE HELP!!)
Through how many degrees does the minute hand move... 1. From 10:00 to 11:00?_______________ 2. From 4:00 to 4:30?_______________ 3. From 6:00 to 6:15?_______________ 4. From 9:00 to 9:05?_______________ 5. From 3:00 to 3:01?_______________ Please Help!! Thank You!! 
Physics
How can discribe in words how to add ten vectors? Please help. Add the ten x components for the x component of the resultant. Call it X Add the ten y components for the y component of the resultant. Call it Y resultant = sqrt (X^2 + Y^2) theta = arctan Y/X (counterclockwise ... 
Physics
I need to make a mousetrap car for my physics class. I have to make it so that it can stop, but I won't know at what distance until the testing day. How should I do it? 
physics
A person throws a physics book off of a cliff at an initial speed of 3 m/s at an angle of 20 degrees. The book is in the air for a total of 2.5 seconds. 
physics 2B
physics 2B A toy balloon is filled with helium gas ( He}) at 1atm} and 30 degrees Celcius. If the volume of the balloon is 0.025 m^3, how many atoms does it contain? 
Physics
physics You kick a .3kg soccer ball at a 30deg. angle. your toe provides an average force of 50N for .5m. How far does the ball go? 
physics isothermal, isovolumetric, or adiabatic
Please check my answers. Identify the following processes as isothermal, isovolumetric, or adiabatic: a. a tire being rapidly inflated adiabatic b. a tire expanding gradually while heating isothermal c. a tire being heated while in a rigid metal container isovolumetric c.... 
physics
The earth moves around the sun in a nearly circular orbit of radius 1.50*10^11m. During the three summer months (an elapsed time of 7.89*10^6s), the earth moves onefourth of the distance around the sun. (a)what is the average speed of the earth? (b) what is the magnitude of ... 
Physics(Thermodynamics)
1. The total enthalpy of 15.000kg of steam at 2250.000kPa is 34191.510kJ. Determine the dryness of the steam. ANS = % 2. Determine the quantity of heat required, to raise 11.100kg of water at 80.000 degrees Celsius, to saturated steam at 2250.000kPa and 71.400% dry. ANS = kJ ... 
English (URGENT) Please :'(
I have trouble understanding of this article and how to answer the questions given. I just started new to school in Toronto; I was living in Turkey for Years So I do please to take your time to look and examine my homework. I greatly appreciate your patience and time and ... 
Physics (please help!)
1000 dust particles are trapped on a surface. There are two energy levels the particles can be in: absorbed on the surface in a zero energy state, or excited with energy E1. At a certain temperature T0, the particles are in thermal equilibrium, and 20 % of the particles are in... 
Environmental Sciencee
Please help me on this question: 33. Wind and water alter the Earth's sufrface by a. blowing away soil and eroding soft rocks b. eroding coastlines c. carving deep gorges d. all of the above I read about this a long time ago, so I don't even remember where it is in my book. ... 
Chemistry(Urgent, please help,thank you)
After performing a freezing point depression experiment I had to find the molecular weight of glycol. Now I have to answer the question what value did I assume "i" to equal and why did I make this assumption. My teacher told us the value of i to use for this was 1. I am not ... 
stats
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone ... 
Special Education Setting Teachers Aide
children with a language or speech disorde are A)sometimes suffering from an aphasia.(my answer) B)always learing challenged. C)able to receive special help only after the third grade. D)unable to use communication boards. can someone please check if this is right please 
Social Studies 1 QUESTION
How did the supreme court decision in Worcester v. Georgia and the Indian removal act lead to the removal and the resettlement of native American groups? (please help i searched it up got nothing looked in my text book didn't understand anything. please help me this lesson is ... 
physics
Jenny is riding on a bus. She has been unable to find a seat and so she is standing in the aisle. Explain, in physics laws and principles, why it is important that she hold onto something while she is completing her journey. 
biology
Can someone please describe what a double helix looks like? I think it looks like fusilli pasta. Is this correct? I'm having a lot of trouble understanding what DNA looks like. Please help, thank you. I am visually impaired by the way. 
Quantum Physics
Suppose you are given an endless supply of qubit pairs in the state 1/sqrt(2)00> + e^iphi/sqrt(2)10>. To estimate the phase angle phi, you run Fourier sampling (i.e. Hadamard on each qubit followed by a standard basis measurement) on this state repeatedly. After 100,... 
Science
Can someone please help me with these questions below thank you. 1. What do you think the impact of the earth's climate will be like if everyone enjoyed the same lifestyle? 2. What will it be like for The health of ecosystems and biodiversity? 3. What will the impact be like ... 
Science  physics
the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ... 
Algebra
Can anyone please check the following for me please Expand (5  2x) Squared (5  2x) (5  2x) 5 sqrd + 5 X  2x + 2x x 5 + 2x X 2x so 5 Sqrd  10x  10x + 4X = 5 sqrd + 4x Am I right..thank you :) 
Math please check answer
Please check my answer thanks :) Add the following and reduce answer to lowest terms. 1/3 +5/6 + and 3/8  1/3 = 8/24 5/6 = 20/24 5/6 = 9/24  37/24 = 1 13/24 
Algebra: Help please
I'm really bad with monomial expressions. Can someone please help? Is 7(m  2) a monomial expression? yes or no Is 3mnp a monomial expression? yes or no 
Physics
I don't know what to make for a physics experiment? 
physics
in physics what does the letter G stand for 
AlgebraMathmate or Reiny or Dr. Bob, please check
I have two short questions which I think I know the answercould you please check? If I write log(b)x  2log(b)y as a single logarithm it would be log(b) x/y^2, correct? If not please help and Is the function f(x) = 1/x a exponential function I think it would be because it ... 
Physics please help!!!!!
A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ... 
Science
The theory of demographic transition is based on the idea that industrial development causes __________ and ___________ progress that affect population growth rates. Please check your assigned reading and post your answer. We'll be glad to help you when we see your thoughts ... 
Psychology
Can somebody please help with these questions please 1: What are the three stages of Hans Selye's General Adaptation Syndrome, and how does your body respond to each one? 2: What are the generally accepted causes of Post Traumatic Stress Disorder? 3: What is the difference ... 
physics
For a particular nonlinear spring the relationship between the magnitude of the applied for F and the resultant displacement x from equilibrium is given by the equation F=kx^2. What is the amount of work done by stretching the spring a distance x_0? a)kx_0^2 b) 1/2 kx_0 c)1/2 ... 
physics
The mass of a carbon atom is 2 x 10 ^ 26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? I got 2.5 x 10^21 which is correct. The second question states: Two carbon atoms are joined by a springlike carboncarbon bond. The potential energy stored ... 
Math
A theatre company allows a group of 10 people to buy theatre tickets at a price of $28 per person. For each person in excess of 10, the price is decreased by $2 per person for everyone down to a minimum of $10 per person. What number of people will produce the maximum revenue ... 
Physics :(( help please TT
A source of ions at point O produces a slightly diverging beam with halfangle of divergence α0≪1. In order to collimate (refocus) the beam, one can apply a uniform magnetic field along the zaxis (see the figure below). If all the ions have the same initial ... 
1 Out Of 100 Math Trick HELP PLEASE!!!
1. Choose a number between 1 and 100. 2. Multiply the number by 5. 3. Add 15 to the number. 4. Divide the number by 5. 5. Subtract the original number. How does this work, please help! 
Physics
i'm really lost here. please show me how to solve this A 0.10 kg piece of copper at an initial temperature of 94 degrees C is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15 degrees C. What is the final ... 
Physics. Please!!
If the force on the tympanic membrane (eardrum) increases by about 1.50 N above the force from atmospheric pressure, the membrane can be damaged. When you go scuba diving in the ocean, below what depth could damage to your eardrum start to occur? The eardrum is typically 8.20 ... 
physics help please
The tub of a washer goes into its spindry cycle, starting from rest and reaching an angular speed of 6.0 rev/s in 12.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 11.0 s. Through how many ... 
physics @ elena
can you please help me with this one At serve, a tennis player aims to hit the ball horizontally. part a)What minimum speed is required for the ball to clear the 0.90mhigh net about 15.0m from the server if the ball is "launched" from a height of 2.50m ? part b)here (... 
Physics. Error equations. Please help!
These two equations concern a lab on the measurement of E/M by the Brainbridge Method. I need to derive the absolute error for two different equations, the first one is: e/m = 2V/B2R2 treat (e/m) as a SINGLE VARIABLE when doing the derivation. The second is B=8μ0N(IIo... 
physics
a projectile shot at an angle of 60 degrees above the horizontal strikes a building 80 ft away at a point 48 ft above the point of projection (a) find the velocity of projection. (b) find the magnitude and direction of the velocity of the projectile when it strikes the ... 
Physics Help Please!!!!
1) A highspeed maglev train is traveling with a changing velocity. what can be said about the forces acting on the train? 2) An automated vehicle in a warehouse is traveling at a constant velocity. what can be said about the forces acting on the vehicle? 
Physics
In TV picture, faint, slightly offset ghost images are formed when the signal from the transmitter travels to the receiver both directly and indirectly after reflection from a building or some other large metallic mass. In a 25 inch set, the ghost is about 1 cm to the right of... 
PhysicsHelp, confused!
A .20 kg ball is attached to a vertical spring. The spring constant is 28 N/m. The ball is supported initially so that the spring is neither stretched or compressed, is released from rest. How far does the ball fall before brought to a momentary stop by the spring? Our teacher... 
physics
For the next part, you will need to know that the position d of an object attached to a spring that oscillates with period T=1.0s is a sinusoidal function of time: d=kcos(2πt)d=kcos(2πt) for some constant k. Assume that the initial position of the object is d0=2.0cm... 
chem HELP PLEASE its physics side of chem
given E, = l^2 h^2 / 2 m r^2 calculate energies for an electron localised to a circle of radius 2 x 10^9 m for l = 0,1,2, draw pictures of three levels and calculate the relative populations of these levels at 300K i did the first bit but came out with, 0, 6.0249 x 106 J mol... 
Physics doppler effect
A radar device emits microwaves with a frequency of 4.73E+9 Hz. When the waves are reflected from a van moving directly away from the emitter, the beat frequency between the source wave and the reflected wave is 751 beats per second. What is the speed of the van? (Note: ... 
Physics
3. What happens to the speed of ocean waves as they come close to shore? How can this be explained from what you've learned so far? (this the teacher means what do the lessons have to do with this question) 4. Sound travels faster through wood than through air. Sound also ... 
Physics
3. What happens to the speed of ocean waves as they come close to shore? How can this be explained from what you've learned so far? (this the teacher means what do the lessons have to do with this question) 4. Sound travels faster through wood than through air. Sound also ... 
Physics
Would someone please check my work ands let me know if I am right? (We are going to do this as a group but I'd like to attempt it on my own first.) Thank you! Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it ... 
math
a dollar bill has an area of 15.86 square inches. If a dollar bill is 2.6 inches long, how wide is it? Please explain how you got please!!! 
Mathtruth table, please check my work!
p > ~q , p > q Are these Equivalent statements? This is my try. Please let me know if these truth tables are correct. p > ~q p q p > ~q p q p > q T T T T T T T F T T F F F T F F T F F F T F F T The statements are not equivalent. 
science... PLEASE HELP!
Is Archaebacteria autotrophic or heterotrophic? Also, is it unicellular or multicellular? I believe it is both autotrophic and heterotrophic and it is multicellular, but I am not sure. Please help! 
Finite Math Help Please!!!
Finite Math Help Please!!! Can someone help me ? I am confused about this Problem? Median Quartile 1 (Q1) Quartile 3 (Q3) for boxplot 9 10 11 12 13 14 15 16 17 18 19 20 Data 
physics
In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 25000V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into ...