A force of 5.0 is required to stretch a certain spring by 1.2 .How far must this spring be stretched for its potential energy to be 0.015 ?

71,469 results, page 86

nutrition and wellness

i have to do a short assignment: Research and discuss the potential GI illnesses that can occur. Include in your reflection the potential causal relationship these illnesses have to dietary and lifestyle choices. the three GI dysfunction i'll focus on includes: Irritable bowel...

physics

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 73.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...

physics

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 295 K receives 73.5 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...

Physics LAST QUESTION

A beetle whose mass is 2 g sits on a turntable at a distance of 12 cm from the center. The turntable is rotating at 33 rpm. (a) What are its acceleration and the centripetal force on it? a =______ m/s2 Fc=_____ N (b) What is the interaction that provides the centripetal force...

physics

if i am pulling a wagon full of puppies that are in dynamic equilibrium must be the net force on the puppies

Physics

Forcefriction=(Psin37+15*9.8)*.70 So Pcos37 must equal to the force, solve for P. how to get the magnitude of P??how to solve for P. thanks a lot~~

Language Arts

"The Sky Is Low, the Clouds Are Mean This is the poem: The sky is low, the clouds are mean, A traveling flake of snow Across a barn or through a rut Debates if it will go. A narrow wind complains all day How some one treated him; Nature, like us, is sometimes caught Without ...

physics modern

1. a) If a photon and an electron each have the same energy of 20.0 eV, find the wavelength of each. b) If a photon and an electron each have the same wavelength of 250 nm, find the energy of each. c) You want to study an organic molecule that is about 250 nm long using either...

bio...

The main result of aerobic respiration is the 1 conversion of radiant energy into chemical energy 2 production of lactic acid as an end product 3 storage of energy in a polysaccharide 4 production of ATP from the breakdown of glucose

Chemistry

Consider the NiCd (nickle cadmium) cell found in rechargeable batteries. 1.)Which element is the cathode when the cell is recharging (being electrolytic)? 2.)How many cells must be present to produce 1.2 V 3.)Which element is the anode when the cell is discharging (being ...

American Gov

“At times, a President has had to turn to roundabout methods in order to achieve his [treaty] goals. When a Senate minority defeated a treaty to annex Texas, President John Tyler was able to bring about annexation in 1845 by encouraging passage of a joint resolution—a move...

HELP AMERICAN GOV

“At times, a President has had to turn to roundabout methods in order to achieve his [treaty] goals. When a Senate minority defeated a treaty to annex Texas, President John Tyler was able to bring about annexation in 1845 by encouraging passage of a joint resolution—a move...

physics

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? W1 is zero, and W2 is positive W1 = - W2 W1 is positive, and W2 is positive W1 is ...

History

So I was reviewing my online lecture for school, and I noticed something the teacher had said. The Plains Indians planted seeds in the Spring, hunted buffalo and small game in the summer, harvested crops and made sure there was a good food surplus for winter in autumn, but in ...

physics

1) What average power is required for a runner with a mass of 85 kg to reach a speed of 8 m/s from a stationary start during a time of 2 s? 2) A 1000 kg car travels east at 30 m/s and collides with a 3400 kg truck travelling south at 20 m/s. After the collision the two ...

physics

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0° ...

Physics

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0° ...

Physics

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.5 m/s, at an angle of 52.5° ...

English

I need help figuring out what strategy is used to begin a essay. Is it Development by example, process analysis, comparison and contrast, definition, classification or causal analysis? Last June, as I stood behind the bright orange guard door of the machine, listening to the ...

Math

Truck transportation has an energy cost of 0.76 kcal kg-1 km-1, and it is about 3700 km from San Francisco to Toronto. If a romaine lettuce grown near SF has a specific energy content of 17.0 kcal (100g)-1 and the diesel-powered truck has a payload of 20,000 lbs, calculate the...

math

Truck transportation has an energy cost of 0.76 kcal kg-1 km-1, and it is about 3700 km from San Francisco to Toronto. If a romaine lettuce grown near SF has a specific energy content of 17.0 kcal (100g)-1 and the diesel-powered truck has a payload of 20,000 lbs, calculate the...

Math/Physics

My question is this: The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no ...

Physics URGENT!!!

At a certain location, the horizontal component of the earth's magnetic field is 2.5 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton.

physics

Charges A through E have a charge of either + or - 5mC. They are placed at regular intervals along a semicircle of radius 7cm. Find the magnitude and direction of the force exerted on an electron placed at the center of the circle. Find the electric potential at the center of ...

physical science

which one is responsible for holding an atom together strong force weak force electromagnetic gravity I answered both weak force and strong force

Physics

is force and normal force the same thing? if not what is the difference. for instancee if a problem said given a force of 20 newtons. would normal force be 20 newtons? please answer !!!!!!!!!

Physics

Two charges are located along the x-axis. One has a charge of 6.3 μC, and the second has a charge of −3.4 μC. If the electrical potential energy associated with the pair of charges is −0.043 J,what is the distance between the charges? The value of the ...

College Physics

Four masses are positioned at the corners of a rectangle, as indicated in the figure below (not to scale). x 1kg------2kg | | | |y 3kg------4kg (a)Find the MAGNITUDE and DIRECTION of the net force acting on the 2.0 kg mass if x = 0.20 m and y = 0.11 m. (b)How do your answers ...

physics

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate the speed of a particle...

algebra.math

Can someone help me with this word problem. How far up a wall will an 11m ladder reach, if the foot of the ladder must be 4m from the base of the wall? Round your answer to the nearest tenth.

Physics - Vision and Optical Instruments

A camera with a 100 mm focal length lens is to be designed to focus on objects from 75 cm to 20 cm. How far must the lens move as the focus is adjusted from infinity to 75 cm? Thank you!

English

Is there a difference between an ELL learner and a struggling reader? I say that to a certain degee there is a difference because an ELL students and a struggling reader. In a sense they both must understand the concept of another language. What is your opinion?

Statistics

A certain lottery is won by selecting the correct four numbers from 1,2....30. The probability of winning if the rules are changed so that in addition to selecting the correct four numbers you must now select them in the same order as they are drawn?

Physics

What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m Physics - Damon, Monday, September 1, 2014 at 6:51am Vi = 60 km/h (1 h/3600 s)(1000 m/km) v = Vi + a t 0 = Vi + a t t = -Vi/a d = Vi t + (1/2) a t^2 25...

Physics

A 4 kg bundle starts up a 30o incline with 128 J of kinetic energy. How far will it slide up the incline if the coefficient of friction between bundle and incline is 0.30? Pls help me solve this, I don't know what formula to use...

physics

An "energy bar" contains 5.6g of fat. a)How much energy is this in joules? b)How much energy is this in calories? c)How much energy is this in Calories?.

relativity

Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the minimum photon energy ...

Physics

A cyclist intends to cycle up a 7.5 degree hill whose vertical height is 170 m. Assuming the mass of bicycle plus cyclist is 95 kg, calculate how much work must be done against gravity. If each complete revolution of the pedals moves the bike 5.6 m along its path, calculate ...

Physics

Help!!!! Please!!! The coefficient of performance of a refrigerator is defined as the ratio of heat extracted from the refrigeration compartment to the work required to operate the refrigerator. A certain refrigerator has a coefficient of performance of 4 and requires 515 W of...

Chemistry

Dioxane C4H8O2 has an enthalpy of fusion = 145.8 Jg-1 and its melting point temp is 11 degrees C. How much energy is required to transform 142g of solid dioxane at 11 degrees C into liquid dioxane, also at 11 degrees C?

Chemistry

During activation energy... A. A catalyst lowers the activation energy by changing the reaction mechanism. B. A catalyst does not change the activation energy. C. A catalyst lowers the activation energy by changing the rate. D. A catalyst raises the activation energy by ...

Chemistry

A substance (CD) decomposes into C and D At the temperature of the experiment, 15.0% of CD is decomposed when equilibrium is established. a) if the initial concentration of CD is 0.200mol/L, what are the equilibrium concentrations of CD, C and D? I got 0.17 for CD and I got 0....

Physics

plz any one i am abit confused can you answer these questions thx 05. The space surrounding a charge within which the influence of its charge extends is known as. (a) Electric field (b) Magnetic field (c) Line of force (d) Electric intensity 06. A region around a stationary ...

science

plz any one i am abit confused can you answer these questions thx 05. The space surrounding a charge within which the influence of its charge extends is known as. (a) Electric field (b) Magnetic field (c) Line of force (d) Electric intensity 06. A region around a stationary ...

Physics.. please help!!!!!

A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. What is the net external force in the x direction? y direction?? Also.... What is the magnitude of the net external ...

Physics

I am stuck on a question that asks for the resultant force(magnitude + direction) question says : A rope is strung between a car and Joe, the car pulls on the rope with a force of 20,000 newton. joe pulls the rope with a force of 25,000N. what is the resulatant force? dont u ...

Physics

A pulley system has an efficiency of 78.0 per- cent. The acceleration of gravity is 9.81 m/s2 . How much of the rope must be pulled in if a force of 469 N is needed to lift a 52 kg desk 2.78 m?

biomechanics

f a 20.8 N horizontal force must be applied to slide a 10.1 kg box along the floor at constant velocity what is the coefficient of sliding friction between the two surfaces?

Physics

A 40 tonne jumbo jet accelerates down the runway at 5 m/s^2. What must be the thrust on each of its four engines? What is the horizontal force that a 700 N pilot exerts on his seat?

Physics

A circuit consists of a 10 ohm resistor in series with 3 identical batteries each with an emf = 1.0V and internal resistance of 5 ohms. a) find potential difference between the terminals b) potential difference across the 10 ohm resistor c) power dissipated in resistor

physics

A skier of mass 74 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 90 m up a 30° slope (assumed frictionless) at a constant speed of 3.0 m/s? J (b) What power (expressed in hp) must a motor have to perform this task? hp

Physics

skier of mass 79 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 3.4 m/s? 1 J (b) What power (expressed in hp) must a motor have to perform this task?

maths

A motorist travels a certain distance x in five hours at an average speed of 90km/h.what average speed must she maintain to cover the distance in 4 hours?

Physics

Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 3.6x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b...

Phys

Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.38 N on it. This force does 2.6x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b...

physics

Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.38 N on it. This force does 2.6x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b...

English

1. Volunteer is not something that you must do. 2. Volunteer is not anything that you must do. 3. Volunteer is not a thing that you must do. 4. Volunteer is not the thing that you must do. 5. Volunteer is not an important thing that you must do. (What is the difference between...

Chemistry/- Dr.Bob222

A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 C. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.10 M, respectively. a. What is the initial cell potential? My answer: 0.56 B b. What is the cell potential when the concentration of Ni2...

physics

Physics Gravitation help...? hello People i need some help with my physics revision sheet. i cant seem to get my head round it. if anyone could help by telling me how to work it out to get the right answer i would be grateful... answers would also be appreciated. ok here is ...

Science

I need help writhing an Essay about Energy! I have to includ at least 9 of these words listed below ; - heat energy - energy transfer -molecules -motion -traveled -data -centimeters -minutes -observations -colder -warmer -conduction PLLLLLLEEEEEEAAAAAAAASSSSSSEEE HELP!!! (:

Math Help

1.Write the fraction 8/9 as a percent. Round to the nearest hundereth of a percent where necessary. A. 88.89%*** B. 1.13% C. 44.44% D. 66.67% 2.Write the decimal 0.237 as a percent. A. 0.237% B. 2.37% C. 23.7%*** D. 237% 3.Jerry sold 7/20 of the total number of tickets that ...

Physics

Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin when it is at its highest point? a. Force acting up and ...

math

Oliver had a lump of play doh that was 2 1/4 inches long . If he stretched it out to 3 times its current length how would it be ?

jonnathan

force of 125 N pulls due west on a body, and a second force pulls N 28.79 W. The resulta force is 212 N. Find the second force and the direction the resultant.

science

a 12V , 3A motor takes 120 minutes to do a certain job. a 120V, 8A motor takes 5 minutes to do the same job. Which motor uses the least energy and by how much?

chemistry

At a certain elevation, the boiling point of water is 98.5°C. How much energy is needed to heat 35.0 mL of water to the boiling point at this elevation if the water initially was at 23.4°C? (Cp=75.38J/(mol*C), d= 1.00g/mL)

Chemistry

Is this right?: Energy is absorbed in order to break bonds because bond breaking requires energy. Or are these two statements completely separate?: "energy is absorbed when bonds break" and "breaking bonds require energy"

math

Solve the problem. An average library contains at least 50 and at most 250 books. How many library owners must be polled to be certain that at least two owners have the same number of books in their libraries?

maths .social science .technology.english

A train travelling at anaverage speed of 100km/h covers a certain distance in 3 h 36 minutes .at what avarage speed must the train travel to cover the same distance in 2h 30 minutes

Chemistry

What mass of benzene(C6H6, molar mass=78.11g/mol) is required to produce 1500 kJ of heat according to the following reaction? 2C6H6(l)+15O2(g) -> 12CO2(g) +6H2O(g) delta H= -6278 I must have tried this so many times. Can you please show me how this is done. Thanks

physics

What linear speed must a 4.0×10−2kg hula hoop have if its total kinetic energy is to be 0.20J ? Assume the hoop rolls on the ground without slipping.

physics

A bowling ball encounters a 0.76m vertical rise on the way back to the ball rack. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. If the translational speed of the ball is 3.80m/s at the bottom of the rise, find the translational speed ...

physics

Approximately how far will the people have to travel to move the truck 1.5m if |Truck force is 4500N and people are 1200N?

Science. (I'm patient, no rush)

Which of the following sets of words can be used to describe the outputs of photosynthesis? A. water, glucose, light energy B. Carbon dioxide, glucose, chemical energy C. oxygen, glucose, chemical energy D. glucose, oxygen, light energy*** Am I correct?

physics

What minimum force F must be exerted on the 4.1 kg cart in order for the 0.4 kg block not to fall? |--------| F |--------||-.4-| ------>|---4.1--| |--------| |--------| u=.49 between 4.1kg and .4 kg block

physics

A 45.0 kg object is moving with a velocity of 17 m/s. How long must a 25.0 N force act on the object to bring it to a complete stop

English

(1) Brenda would have liked to have taken her vacation at the beach. (2) However, the weather forecast on the television called for rain. (3) Also, her fiancé, Max, wanted to vacation in the mountains. (4) After a heated discussion, Brenda and Max decided to compromise. (5) ...

Physics

Original Question: A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 5.00 cm. What is the oscillation frequency of the two block system? bobpursley s'ltn: F=kx = mg x=mg/k but for the second block we have x...

Science

Jill is jumping on a trampoline in her backyard. When will she have both potential and kinetic energy? A. Halfway between the highest point and the lowest point of a jump B. At the highest point of a jump C. At the lowest point of the jump D. Just before she begins a jump

Physics

An electron is placed near a neutron. Which statement best describes the electrostatic force between them? a) there's no force between them since one is neutral b)there's a force of repulsion between them c)there's a force of attraction between them Isn't it a) because ...

physics

An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance of 6.00 m. What is the change in the kinetic energy of this object?

physics

The force F = (3.2, -7.1) N acts on a mass of 1.15 kg. At time t = 0 s, the mass has a velocity v0 = (-0.46, 0.36) m/s. What is the initial kinetic energy (in J)? i know that k=.5mv^2 so the answer i got was (.12167,0.07452) but i'm not sure what to do from there?

physics

A 5kg box on a horizontal plane has a coefficient of kinetic energy of 0.2. The object is pulled on horizontally with a rope at 2 m/s^2. With 9.8m/s^2 gravitational force, what is the tension on the rope?

physics

a body of mass 5kg initially at rest is subjected to a force of 20N. find the kinetic energy acquired by the body at the end of 10s.

Science

Electrical energy can come rom 3 types of energy: __________, __________, and __________. heat, nuclear, solar energy (sunlight)_ Thankz! :)

physics

1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work? (Points : 1) 0.00 N 10.0 N 17.3 N 20.0 N Question 2.2. A man carries a 10 kg sack of groceries ...

biology

Why must plants have both mitochondrion and chloroplasts? Thanks in advance. I think it has something to do with the fact that chloroplasts convert sunlight into chemical energy. Does that sound right? One of the most widely recognized and important characteristics of plants ...

physics

another question: the 20 kg block is at the top of a 10 m long inclined plane. The block starts from rest and slides without friction down the length of the incline. The block is 5 m high. 1) Determine the gravitational potential energy of the block at the top of the incline. ...

Physics

A 66.2 kg person sits on the 5.3 kg sled (slope is on an angle, angle not given). It is to be pulled across the snow with a coefficient of friction equal to 0.12. What horizontal force is required to pill the sled at a constant speed?

Physics

A 200kg car is traveling at 50m/s on a level, circular track with radius 100m. What is the traction force required to keep the car on the track? a. 25000N b. 50,000N c. 10000N d. 2500N e. 5000N

physics 211

A deep-sea fisherman struggles to bring in a big salmon (see figure below). Find the force each hand must exert on the pole if the tension in the line is 159 N. Neglect the weight of the pole and assume that the force exerted by the left hand is directed along the horizontal...

Science (Physics)

A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?

Art

Creativity has allowed or innovation for many industries. How has creativity affected the energy industry? It has allowed for the same traditional energy sources to continue being used for generations.(MY ANSWER) It has allowed for new energy source to be discovered and used. ...

Art

Creativity has allowed or innovation for many industries. How has creativity affected the energy industry? It has allowed for the same traditional energy sources to continue being used for generations. It has allowed for new energy source to be discovered and used. (MY ANSWER...

Chemistry (check formula please)

how much energy (in kJ) is required to change the temp of 1.00 kg of Fe from 25.0 degrees celsius to 1515 degrees celsius? the specific heat capacity of iron is 0.449 J/g*K. this is the answer i got. q=(.449)(1.00)(1490)= 669.01 kJ

Science

The bottled water industry has become an enormous, multi-billion dollar a year industry.there are some negative impacts of bottled water idustry on enviroment.many of these bottles are recycled by conscientious consumers, most are not, and are ending up in increasingly over-...

physics

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the membrane is 9.00*10-9 m. What is the magnitude of the electric...

Chemistry

The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on the page for the ...

physics

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (as shown in the figure below). Suppose that you loft the ball with an initial speed of v = 15.6 m/s, at an...

8th grade science

Please show me how to solve this problem. A person wearing a shoulder harness can survive a car crash if the acceleration is less that -300 m/s2. How far must the front end collapse if it crashes while going 101 km/hr? Thanks.

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