physics please HELP !
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physics
A weight is hung by a cord from the ceiling of an elevator. From the following conditions, choose the one in which the tension of the cord would be the greatest...least?(draw force diagrams) a) elevator descending at a decreasing spped b)elevator at rest c)elevator rising at ... 
Physics HELP!
An ant and a beetle are riding a spinning record on a record player. The ant stands on the outside edge of the record while the beetle stands on the record's label. The ant is four times as far from the center of rotation as the beetle. What is the ratio of the ant's ... 
physics
A child pushes a merrygoround with a force of 80.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merrygoround has a radius of 1.15 m, how much work does she do? If you could please ... 
Physics
(Someone please help me !! I don't understand this.) Two tiny conducting spheres are identical and carry charges of 27.3C and +61.0C. They are separated by a distance of 2.64 cm. (a) What is the magnitude of the force that each sphere experiences? (b) The spheres are brought ... 
physics  please help
A golf ball of mass 0.045 kg is hit off the tee at a speed of 48 m/s. The golf club was in contact with the ball for 5.4 103 s. (a) Find the magnitude of the impulse imparted to the golf ball. (b) Find the magnitude of the average force exerted on the ball by the golf club. 
physics help!
A tire is filled with air at 17 degreees C to a gauge pressure of 220 kPa. If the tire reaches a temperature of 39 degrees C, what fraction of the original air must be removed if the original pressure of 220 kPa is to be maintained? Please help step by step! 
Physics
The problem goes like this... You are pushing a shopping cart at a constant speed. The handle makes an angle of 30.0 degrees with the horizontal and the friction in the cart has a coefficient of 0.400 to account for all the axles, etc. The mass of the cart is 45.0kg and we ... 
PHYSICS
Driving in your car with a constant speed of v = 11.7 m/s, you encounter a bump in the road that has a circular cross section, as indicated in the figure below. If the radius of curvature of the bump is r = 34.4 m, calculate the apparent weight of a 65.9 kg person in your car ... 
Physics
The gravitational force exerted on a baseball is 2.28 N down. A pitcher throws the ball horizontally with velocity 12.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 177 ms. The ball starts from rest. (a) Through what distance does it... 
physics
A car travelling at 25 m/s slams its break leaving skids marks along a distance 125 m as it comes to rest. the coefficient f friction between the tire and the road is a 5 b 2.5 c 1 2 .4 e .25 A 500N worker pulling a 500 N crate on a rope with a force of 50 N at a constant ... 
Physics HELP!
A mountaineer estimates the depth of a crevasse by dropping a stone and listening for sound when the stone hits the bottom. The speed of sound in air is 340m/s. If the sound is heard 10s after the stone is dropped, what is the depth of the crevasse? Do you find velocity first... 
Physics help please!
The three 500 g masses in the daigram are connected by massless, rigid rods to form a triangle. What is the triangle's rotational energy (in J) if it rotates at 1.50 rev/s about an axis through the center? (Diagram shows equilateral triangle with 500g masses at each point, the... 
math
A school has 63 students studying Physics, Chemistry and Biology. 33 study Physics, 25 Chemistry and 26 Biology. 10 study Physics and Chemistry, 9 study Biology and Chemistry while 8 study both Physics and Biology. Equal numbers study all three subjects as those who learn none... 
PHYSICS PLEASE HELP!
(a)How much work is done by the field in moving the electron through a distance of 7 cm? J (b) Through what potential difference will it have passed after moving through this distance? V (c) How fast will the electron be moving after it has traveled this distance? m/s 
lang. arta
read the following question: Brian,would you please take that binder to Mrs.Smith with the red cover? What is the best way to correct the misplaced modifier in the above sentence? A. Brian,would you please take that binder with the red cover to Mrs.Smith? B.Brian would you ... 
physics
The length of a simple pendulum is 0.79m and the mass of the particle at the end of the cable is 0.24 kg. The pendulum is pulled away from its equilibrium position by an angle of 8.5 degrees and released from rest. Assume that friction can be neglected and that the resulting ... 
Physics. LAST PROBLEM!!
A small metal ball with a mass of m = 82.5 g is attached to a string of length l = 1.72 m. It is held at an angle of θ = 58.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides headon and perfectly elastically with an ... 
Physics Eletric fields and coulomb's law)
Please, I need the development and correct answer for this problem. I would really appreciate it. An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized, and has a charge of +e. If the field meter reads 0.000000202 N/C, how far ... 
Physics
Light travels in a line of optical fiber by total internal reflection between a core of refractive index 1.48 and a cladding 1.46 refractive index. The critical angle for total internal reflection to occur inside the core of the fiber is ... 80.6º 48.8º 43.2º 42.5º 24.4º ... 
physics
A 82 kg adult sits at one end of a 8.6 m long board. His 23 kg child sits on the other end. Where should the pivot be placed so that the board is balanced, ignoring the board's mass? Find the pivot point if the board is uniform and has a mass of 15 kg. Please help with stepby... 
Physics(please check)
A 53N crate is suspended from the left end of a plank. The plank weighs 21 N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a support that is 0.30 m from the left end of the plank. How far to the right of ... 
physics please !
A 3.0kg block sits on top of a 5.0kg block which is on a horizontal surface. The 5.0kg block is pulled to the right with a force as shown in the figure . The coefficient of static friction between all surfaces is 0.65 and the kinetic coefficient is 0.42. PART A: What is the ... 
physics please !
A 3.0kg block sits on top of a 5.0kg block which is on a horizontal surface. The 5.0kg block is pulled to the right with a force as shown in the figure . The coefficient of static friction between all surfaces is 0.65 and the kinetic coefficient is 0.42. PART A: What is the ... 
physics
Galileo's first telescope used a convex objective lens with a focal length f = 1.65 m and a concave eyepiece. When this telescope is focused on an infinitely distant object, and produces an infinitely distant image, its angular magnification is +3.11. What is the focal length ... 
physics
Orders of magnitude 4: Assume again a Rubidium atom (mass m=87⋅u) is initially at rest. Again it then absorbs a photon of wavelength λ=780 nm. What is the kinetic energy Ekin of the atom after this process? Please give the energy in μK⋅kB units. This is ... 
physics
ok im doing my physics homework and we have to submit the answers online. i keep getting these questions wrong and i only have one more try can someone please tell me how to work it? a 2.5 kg otter starts from rest at the top of a muddy incline 94.6 cm long and slides down to ... 
physics
hi I have a problem I can't seem to get right. here it is. "A retired bank president can easily read the fine print of the financial pages when the news paper is held no close than arm's length, 66.4 cm from the eye. What should be the focal length of an eyeglass lens that ... 
Physics Elena please help!
A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ... 
Physics
A paralle plate air capacitor has a capacitance of 500.0 pF and a charge of magnitude 0.200 uC on each plate. The plates are 0.6 mm apart. (a) What is the potenetial difference between the plates? (b) What is the area of each plate? (c) What is the electric field magnitude ... 
Physics...help please!
I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the maximum height reached... 
NEED HELP PHYSICS!!!
Tarzan (m = 78.4 kg) tries to cross a river by swinging from a vine. The vine is 10 m long. Tarzan doesn't know that the vine has a breaking strength of 1045 N. What maximum speed (in m/s) can Tarzan have at the bottom of the swing (as he just clears the water) in order to ... 
Physics Check My Work Please
Determine the minimum angle at which a roadbed should be banked so that a car traveling at 20 m/s can safely negotiate the curve if the radius of the curve is 200m. * Data: v=20 m/s r=200m *Formula TAN(theta)=v^2/rg *Solution TAN(theta)=(20 m/s)^2/(200m)(9.8 m/s^2) TAN(theta... 
physics
A pushes with force of 300 N at 25 degrees. B pushes with force of 275 N at 160 degrees. C pushes with force of 325 N at 300 degrees. Find resultant force. I got 187 N at 19 degrees or 161 degrees. Correct? or could you explain more please? Thank you. 
physics as
the figure below shows the graph of force,F (y axis)acting on a trolley of 0.4kg against time,t (x axis) 20 ........._ ........._... ........._.... ........._...... ........._....... 0........5............9 The velocity of the trolley is constant ... 
Physics  please help!
I don't understand this: Russian ice skater, Alina Zagitova, spins her way to projected Gold in the 2018 Olympics. During one particular spin, she moves from a camel spin that rotates at about 95. RPM to a tight spin. If her rotational inertia changes from 129kgmÂ² to 32kgm... 
Physics
Packing material made of pieces of foamed polystyrene can easily become charged and stick to each other. Given that the density of this material is about 35 kg/m^3, estimate how much charge might be on a 2.5 cm diameter foamed polystyrene sphere, assuming the electric force ... 
physics
Apparently, this website cannot display photos, so I'm gonna type my question: A railway truck of mass 8340kg traveling at 14.3ms1 collides with another truck of mass 6420kg traveling at 8.78ms1 in the same direction. 1. If after collision the two trucks become joined ... 
Physics please help
Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North) 
physics PLEASE HELP
Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North) 
physics
A student is thrown in a lake by his teacher, the student has a mass of 70 kg and a volume of 80,000 cm^3. Would the student sink or float? What is the net force on the student? What is the density of an object that has a mass of 2000 kg and a volume of 1.5 m^3? Would it sink ... 
Physics
What is the smallest possible value for the angular momentum L of an electron in the n=5 shell? Lmin= 0 kg*m^2/s What is the largest possible value for the angular momentum L of an electron in the n=5 shell? What is the Lmax? Please help I don't get this.Thank you! 
Sorry Chemistry / Ionic Bonding
Hello My exams are coming I'm a straight A student .. the problem however is : My textbooks , teacher and every piece of work that he gives us is complicated can someone explain me how Ionic Bonding works . Please I really beg you... I need your help! My teacher sucks in ... 
precalculus
the population of a country is 65 millions if it grows exponentially in a rate of 1.5% annual 1.calculate the estimate population in 12 years 2.when the population increases 4 times could somebody please explain me this kind of problems where you need to use the log and ... 
Ms, Sue please respond
I had posted a serious letter of a real situation that happenned. I sm trying to write this letter for that reason. I am not sure where it will seem like an excuse if i bring the forms. please suggest a better way of writing the letter. 
math
sums and differences of rational algebraic expression answer the following perform the indicated operation reduce answers to lowest term 2x/x^22x15  x2/3x^2+9 another is t/2rs^2  2r/3rst + 3s/30r^2t another is 3x/2x3  2x/2x+3 + 3/4x^29 please answer this i need it ... 
Physics
two binary stars moving in a perfect circle orbit The stars have the same mass, the distance between them is one billion km (1x10^9 km), and the time each takes for one orbit is 10.4 Earth years. Determine the mass of each star (m1=m2). (this problem DOESN'T uses the gravity ... 
Physics
Hi everybody! I need this quick answer, please help! The beam AB in the figure has length 3L and uniform section stiffness EI. The beam is fixed at A(x=0) and loaded by an upward concentrated force, P, applied at its free end B(x=3L). A concentrated moment Q is also applied, ... 
Physics, still don't get it!
Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 102 m2, and the pressure outside the cylinder is 1.02 105 Pa. Heat (2109 J) is ... 
Physics  electricity
An incandescent lamp is marked '120v,75W' a)what is the current in the lamp under normal condition of operation? b)How much does it cost per hour to operate the lamp if the price of electrical energy is $6.00 per unit? Please stop posting under different names. Use ohms law, ... 
physics
A stone is observed falling past a small window 1 meter tall in 0.2 seconds. how fast is it moving as it passes the bottom of the window?how far is the bottom of the window from the roof, where the stone originally began its fall from rest?what is the stone's average speed as ... 
Nuclear physics
1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the mummy? Determine its... 
Physics( Checking answer)
Sorry for reposting but I really need to know if I did it right. Please someone help! Two 3.0g bullets are fired with speeds of 40.0 m/s and 80.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic ... 
PHYSICSLAW OF THERMODYNAMICS
A dinner plate drops and breaks. This best illustrates the ______ law of THERMODYNAMICS A. 1st b. 2nd c. 3rd d. 4th I am inclined to say the 1st because energy can be neither created nor destroyed, it can only change forms. Thus the plate falling lost it's energy as a whole, ... 
Physics PLEASE HELP ASAP :)
A small spherical insulator of mass 8.96 102 kg and charge +0.600 μC is hung by a thread of negligible mass. A charge of −0.900 μC is held 0.150 m away from the sphere and directly to the right of it, so the thread makes an angle θ with the vertical (see ... 
Subjectverb agreement
which of the following sentences demonstrates proper subjectverb agreement? A. News travel fast. B. Measles usually spread through respiratory fluids. C. Physics is a difficult subject to learn. D. They study of various sciences are compelling. A and D are not correct. C is ... 
physics
A bar 4.0 m long weighs 400. N. Its center of gravity is 1.5 m from one end. A weight of 300. N is attached at the heavy end and a weight of 500. N is attached at the light end. What are the magnitude, direction, and point of application of the force needed to achieve ... 
Physics
A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity. Find a) the coefficient of static friction between crate and floor. b) the coefficient of kinetic friction ... 
critical thinking
how do assumptions relate to the process of critical thinking? Please note that we don't do students' homework for them. Once you have come up with a response to these questions, please repost and let us know what you think. Then someone here will be happy to critique your ... 
writing/historyQUICK PLEASE
Hi, I'm trying to write a good lead for my research paper on Confucius. I'm using the "snapshot" method. So, I need an important event in Confucius' life that I can describe in writing. PLEASE HELP!!!! THANKS IN ADVAVCE! aShLeY 
Please Help:(
I really need someone to look at my previous posts and edit them if they need to be edited. Please point out any grammatical errors. Thank you very much. You will find my posts as soon as you enter my name in the Search Box. 
chemistry please help!!
A 0.2mol/L solution of KMnO4 has been added to 10 ml of 0.5mol/L acidified FeSO4. write the balance equation of the reacttion then calculate the volume of the oxidizing solution that should be added to oxidize all the Fe^2+ ions. please help and thank you!! 
Math
Can you please help me select at least five numbers; 0 (zero), two even, and two odd numbers and do a simple substitution of number for variable in a formula. And can you explain each step and show the work on how you came up with the answer please thank you. 
integral Calculus
ʃ (4sin²x cos²×/sin2x cos2x)dx i've got it from the book and it has an answer from the back page of the book but i want to know how to solve it..i really need it for practicing this subject...please please help..Thanks a lot.. the answer is: 1/2 lnsecx + tanx + c 
health informatics
how is emerging technology influencing healthcare? and give an example. all what i know is that they are basiclly new technologies and my example is about tissue engineering but the problem is that i don't know how it influences the healthcare!!! so please please your help!! i... 
calculusplease help!!
given the following piecewise function F(x)={x+11 for 9¡Üx<3 2 for 3¡Üx¡Ü2 2x6 for 2<x¡Ü5 {this symbol is to be around all three of the lines. Find: a. the domain b. the range c. the intercepts d. if f continious on its domain. If not, state where f is ... 
English
Having problems with a introductory sentence. Its a essay on dying and living. I wrote a question to start my intro. Sentence. Or I wrote The professor died in 1974 of Cancer. Someone please let me know if I started out right. Please 
MusicPLEASE ANSWER!
I need a variety of tutors opinions and choices of what song they like the best. just write the name of the song amongst with the artist PLEASE SPREAD THE WORD ACROSS AND ANSWER BELOW ASAP! 
LiteraturePlease, help me!
Please, I desperately need help with these questions. These questions regard "The Rug Merchant" by James A. Michener. 1. Which of Zaqir's words and actions create the vivid portrait of him? 2. What do you learn about Michener's character through his storytelling? 
Calculus Help Please Urgent!!!
find the limit algebraically. Use L'Hospital's Rule where appropriate. If there is a moare elementary method, consider using it. If L'Hospital's Rule doesn't apply, explain why lim > 0 (cot(x)(1/x)) show work please!!! 
Algebra 1 Explanation (Anyone, please!)
Please, can anyone explain the concept of graphing quadratic functions to me? For example, how must I graph gradratic functions such as y = x^2  2x  3? If anyone could also include stepbystep solving methods, I would truly appreciate it. 
Science Please Help!
Some constellations, such as Ursa Minor, are visible in the sky yearround; other constellations appear for only part of the year. Explain why this happens. I've been trying to figure it out but I can't please help me! 
Chem
A student mixed 6 g of ice at 3.4 degrees celsius with 1 g of steam at 103 degrees celsius. What was the final temperature of this mixture.i tried equalling mcdelta T. Please help asap. I would be eternally grateful. Please answer in kj or J only 
english
Need help with an assignment please.I am going to explain this to the class and I want to feel confident.Your help is appreciated. Its Allusion. I picked "Someone who perservers and never gives up." I have to identify what it means, and researh their story, the one the writer ... 
english
Can someone please help me! I have to write an essay and I have to choices one is to write about where did the people of Early America find connections. I don't know where, but if someone can help me find a website, or tell me what happen I will greatly appreciate it. The ... 
Physics PLEASE HELP
A painter climbs a ladder leaning against a smooth wall. At a certain height, the ladder is on the verge of slipping. Let the mass of the painter be 69.0 kg, length = 2.80 m, the ladder’s mass to be 21.0 kg, θ = 57.0°, and the coefficient of friction between ground and... 
Physics
A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 4.1 m/s at the end of 7.6 s. At that time, the kinetic energy of the system is 86 J and each mass has moved a distance of 15.58 m. Find the value of ... 
physics please help :)
a.the gravitational force between 2 electrons 1.00m apart is 5.42x10^71 N. Find the mass of an electron. b.2 spherical balls are placed so their centres are 2.6m apart. The force between the balls is 2.75x10^12N. What is the mass of each ball if one ball is twice the mass of... 
Physics
A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to even startI'm ... 
Physics(Please help)
An object is inside a room that has a constant temperature of 295 K. Via radiation, the object emits three times as much power as it absorbs from the room. What is the temperature (in kelvins) of the object? Assume that the temperature of the object remains constant. I thought... 
physics
Q1In hugyen's principle of wave theory why the waves are move in forward direction not in backward direction means they move forward as a new source why not in backward direction? Ans I think that waves move in forward direction sir i know that only so please give me a ... 
Algebra 8th grade please help!!!!!!
A right triangle has an area of 13 m2. The dimensions of the triangle are increased by a scale factor of 3. What is the area of the new triangle? Please help!!!! a)39 m2 b)169 m2 c)117 m2 d)142 m2 
SAT
please help. I am a foreigner. I need to get into a US college for a bright future. I bought the College Board SAT book. It has no word lists. How do I do well in the SAT? Any tips? Please give me help. 
Math  Absolute Value Inequalities
Please help me with the following: Which of the following expressions is equivalent to x – 2 < 3? A. –3 > x – 2 < 3 B. –3 < x – 2 < 3 C. x – 2 < 3 and x – 2 < –3 D. x – 2 < 3 or x – 2 < –3 I know the answer isn't A because I ... 
math
math . please help me to answer this i really don't know what is the answer I need the answer later i have 2 more hours to finish this. please help me Find the value of x if the geometric mean of 2x and 19x2 is 7x2 
Physics
The maximum torque experienced by a coil in a 0.90 T magnetic field is 8.4 104 N·m. The coil is circular and consists of only one turn. The current in the coil is 3.9 A. What is the length of the wire from which the coil is made? Please tell me if I am going in the right ... 
PHYSICS
HELP. I need to understand this for a test tomorrow. THANKS Consider planet mass of 4.98 E 21 kilograms with a satellite orbitting it at distance of 3.11 E 6 meters from planet's center. Satellite has mass of 369 kilograms. How long (inseconds) does it take the satellite to ... 
Physics
Please, help me with this problem... im a bit confused abt solving it.. In a tank of volume V=7.5 L, temperature T=300 K, there is a mix gases: n1=0.1 mole of oxygen, n2=0.2 mole of nitrogen, n3=0.3 mole of carbon dioxide. Considering the gases ideal, find: (a) the pressure of... 
Physics (please help!!!!)
A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. A Foucault pendulum displayed in a museum is typically quite long, making the effect easier to see. Consider a Foucault pendulum of length 16 m with a 109kg brass bob. It is set to swing with ... 
Physics(Please help)
Some bacteria are propelled by motors that spin hairlike flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x108m, and a tangential speed at the rim of 2.7x105 m/s. (a) What is the angular speed (the magnitude of the angular ... 
Physics
The 56 kg man in the roller coaster car is sitting on a bathroom scale. If he is traveling at 40.9 m/s at the point shown and the radius of the vertical coaster track is 87 meters, to the nearest newton what does the scale read? What is the answer to the previous problem if ... 
Physics
I am doing this exercise for physics class where I have to place a penny on a ruler and balance it. And I don't understand what is the use of knowing the center mass of an object when making a calculation? 
physics
for a microwave with a wavelength of 3cm, calculate the frequency. Would this number change if physics suddenly broke and the speed of light in air decreased by a factor of 2? 
Physics
7) Find the force of gravity between two 74.0 kg physics students that are sitting 0.85 m apart 7579.24 N 5.057 x 10(7) N None of these choices are correct 9.8 x 10(7) N I'm unsure of how to begin. 
physics
A student applies an upward force of 56 N to a 5.6kg physics textbook. Find the book’s acceleration (positive for up, negative for down). answer in miles/seconds squared. 
physics
A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics 
physics
A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics 
physics
a motor car of mass 800kg travelling at 20m/s is brought to rest by breakes in 100m.calculate the average breaking force required.in physics 
Physics
Why do seat belts reduce the likelihood of injury in an automobile accident? Why do airbags? Express your answers in terms of the physics principles we've been learning this week? 
Algebra help+check please?
Graph the function. Compare the graph with the graph of f(x)=x q(x)=x1 How would I do this? Cause, I do know that f is the same thing as y and so that in the problem it'd be y=x1 right? Could somebody please explain how to do this STEP by STEP? 
Math... PLEASE HELP!!
If one angle in a pair of vertical angles measures 42 degrees and the other measures 2n4 degrees, which is the value of n? I got 23 degrees but I am not sure if it is correct. Please help me...