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September 1, 2015

Search: 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 ?

Number of results: 61,021

physics
A string is hanging from the rearview mirror of you car and a ball is at the end of this string. Suppose that you drive around a circular track at fixed speed. Which list below gives all the forces that act on the ball? A) tension and the force of gravity b) tension force of ...
November 23, 2009 by julia

Physics
What force is must a jet's boat engine apply to accelerate the boat from 50 km/h to 100 km/h in 6.0 s? The mass of the boat is 800 kg and the coefficient of kinetic friction is 0.30. I found acceleration by doing v2-v1 / t, but im not sure what to do next?
September 28, 2009 by Anonymous

Physics help please
A crate is dragged 5.0 along a rough floor with a constant velocity by a worker applying a force of 125N to a rope at an angle of 30degrees to the horizontal. Calculate the work done by the tension in the rope, the force of friction, and the net force. I know the work don on ...
December 5, 2013 by K

physics
A thin rod of mass M and length L is lying on a frictionless table. It is given an impulse of 4.5 N*s by a force of magnitude F on one end at an angle of 35 degrees to the rod. How far will the center of mass of the rod travel when the rod has completed 12 revolutions?
November 2, 2014 by Marychan

electricity
to use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your? A) thumb in the direction of the magnetic flux. B)thumb in the direction of the electromagnetic force. C)forefinger in the ...
August 23, 2005 by angela

algebra
The horsepower (hp) that a shaft can safety transmit varies jointly with its speed (in revolutions per minute, or rpm) and the cube of the diameter. If a shaft of a certain material 2 in in diameter can transmit 36 hp at 75 rpm, what diameter must the shaft have in order to ...
October 3, 2011 by Wen

physics
1. a force of 30n with a direction of 35 degrees northwest acts on point p. Find: a) the northward component on the force b) the westward component of the force Please show work. Thanks!
June 21, 2011 by Molly

Chemistry
the specific heat of aluminum is 0.900 J/g degrees celsius. how much energy is required to heat 45.0g of aluminum from 20.0 degrees celsius to 50.0 degrees celsius. a. 2840 J b. 810 J c. 1220 J d. 2030 J
October 16, 2011 by Meg

Physics
A 51 kg block of metal has specific heat of 222 j/kg c. how heat energy must be applied to the block of metal to raise its temperature from 10 c to 22 c?
March 22, 2015 by Heather

Physics
The coefficient of static friction between the 3.00 kg crate and the 35.0 degree incline is .300. What minimum force must be applied to the crate from sliding down the incline?
September 28, 2011 by Dee

physics
You can keep a 3 kg book from dropping by pushing it horizontally against a wall. What force must you apply to the book to keep it from falling? What is the coefficient of static friction?
August 9, 2012 by kacey

physics
A -kg block is initially at rest on a frictionless horizontal surface. It is pulled with a constant horizontal force N. How long must it be pulled before its speed is m/s? t_{pull} =
February 21, 2014 by sean

PHYSICS
A -kg block is initially at rest on a frictionless horizontal surface. It is pulled with a constant horizontal force N. How long must it be pulled before its speed is m/s? t pull =
February 23, 2014 by cristy

Physics
You are the physics expert for a professional stuntman. The stunt you have designed includes a ramp that is angled at 30°. You expect that the stuntman will be traveling at 18.0 m/s when he leaves the ramp. How far must the landing ramp be positioned, and what is the maximum ...
December 18, 2010 by George

Math
the eighth grade students are selling magazine subscriptions to raise money for a class trip. they earn $3 for every subscription they sell. so far, they have earned $228 of the $396 needed. how many more subscriptions must the students sell to meet their goal?
March 16, 2015 by Student

English
Thank you very much. I forgot to include the following sentences. 1) Refer to situations in which robotic planes have proved to be useful. 2) Which scientific methods does forensic science adopt to catch potential criminals? 3) What/Which skills are forensic artists required ...
March 27, 2011 by Mike

Bio/Science PLEASE HELP
If the axo-membrane becomes more permeable to potassium ions.. Which onewould be true? A. the inside of the membrane will become more positively charged. B. the membrane will depolarize rapidly. C. it will take a stimulus of larger magnitude to initiate an action potential. D...
October 28, 2013 by Talan

physics
Energy is released during a nuclear reaction due to a conversion between mass and energy. Mass is not conserved. The initial and final amounts are different. If a total of 4.6 g of mass were “missing”, how much energy is released? The speed of light is 3 × 108 m/s...
May 29, 2013 by Anonymous

physics
A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal. (a) Determine the work done by the applied force. J (b) Determine the work done by the normal force exerted by the table. J (c) ...
October 10, 2012 by monic

physics
A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal. (a) Determine the work done by the applied force. J (b) Determine the work done by the normal force exerted by the table. J (c) ...
October 12, 2012 by monic

Physics
I need immediate help on these questions:. 2.a small plastic ball with a mass of 0.005kg is suspended from a thread and hangs in equilibrium as shown in the drawing below when a small rod with a 2 uC charge is brought to within 3mm of the ball a)find the tension force in the ...
March 30, 2014 by Julie

physics
the mass of the water is 131 kg and its initial temperature is 24.2°C, how much energy must the water transfer to its surroundings in order to freeze completely? The specific heat of water is 4186 J/kg·K, and the latent heat of fusion is 333 kJ/kg
August 5, 2014 by kb

Physics
A 1.4-kg object moves along the x axis, subject to the potential energy shown in the figure. If the object's speed at point B is 1.70 m/s, what are the approximate locations of its turning points? ___________m (left-hand turning point) ___________m (right-hand turning point...
May 2, 2015 by Anonymous

Physics
A hydraulic jack is used to move an 8896 Newton car. If the area of the output piston is 8 times that of the input piston, how much input force is required to lift the the car? Is this where I do P=PA or F1(A2)/F2 = A1(f2)/F2 F1 = A1F2/A2 Please help set this up. F2=8896 A1=8 ...
February 18, 2012 by GRISSELL

Physics
The bulk modulus of water is B = 2.2 x 10^9 N/m2. What change in pressure Delta P (in atmospheres) is required to keep water from expanding when it is heated from 12.4 °C to 31.1 °C? I know that the equation for pressure is Delta P = Force / Area but I have no idea what I have...
April 21, 2014 by Kace

Physics
A 56.6kg hiker starts at an elevation of 1270m and climbs to the top of a 2660 peak. (I know the answers to B and C, I just have a question on A) A) What is the change in the hikers potential energy? I took PE=mg(h2-h1) and got (56.5)(9.8)(2660-1270)=769643J When I checked my ...
June 5, 2010 by Elisabeth

Pre-Calculus
I'm having trouble with this question. The number of horse-power H required to overcome wind drag on a certain automobile is approximated by: H(x)= 0.002(x)^2 + 0.005(x) - 0.029, [10 is less then/equal to (x) is less then/equal to 100]. Where x is the speed of the car in miles...
February 8, 2011 by Sam

physics
How much work is required to lift a 600-kg satellite to an altitude of 4 * 10^6 m above the surface of the earth? The gravitational force is F=GMm/r^2, where M is the mass of earth, m is the mass of the satellite, r is the distance between them. The radius of the earth is 6.4...
February 11, 2011 by Allison

physics
A 981-kg satellite orbits the Earth at a constant altitude of 103-km. How much energy must be added to the system to move the satellite into a circular orbit with altitude 199 km? I need answer in MJ please tell me what formula
March 11, 2011 by Rachel

Chemistry
Calculate the mass of propane, C3H8(g), that must be burned in air to evolve the same quantity of energy as produced by the fusion of 1.0 g of hydrogen in the following fusion reaction: 4H ---> He + 2e- Assume that all the products of the combustion of C3H8 are in their gas...
January 6, 2013 by Tima

physics
A car travels along a straight stretch of road. It proceeds for 15 mi at 55 mi/h, then 29 mi at 43 mi/h, and finally 37.9 mi at 33.7 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h
August 23, 2011 by tom

Pre-calculus
As you drive down a mountain, you see a sign that says there is a 6 degree grade over the next 5 miles. What is the change in elevation over that 5 mile stretch?
May 22, 2013 by Natalie

math
What type of graph would be appropriate for displaying this type of data? The following are prices (in dollars) 2004 autos as listed in a sale ad in the auto section of the newspaper: 12,997 14,891, 18,666, 21,799 17,495 17,266 21,517 14,414 14,257 15,634 15,734 27,825 28,015 ...
August 29, 2010 by Sarah

History
what is the term meant for "A vote on an initiative" were doing a corssword the answer as far has 10 spaces and acording to my other answers to the cross word the second and fourth letters are "e" Also... "Name of the policies supported by Woodrow Wilson" It's also a ten ...
October 20, 2009 by History

physics
An electron is moving through a magnetic field whose magnitude is 8.70*10^-4 T. The electron experiences only a magnetic force and has an acceleration of magnitude 3.50*10^14 m/s^2. At a certain instant, it has a speed of 6.80*10^6m/s. Determine the angle (less than 90degrees...
April 1, 2008 by Kelly

Physics
A block is sitting on a rough ramp. It is found that a force of F = 200.0 N (directed up the ramp) is required to keep the box from sliding back down the ramp. The angle 𝜃 is 35.0o and the mass of the box is 150.0 kg. What is the coefficient of static friction between...
May 13, 2014 by Tom

chemistry
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 ∘C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g⋅K and 0.67 J/g⋅K, respectively. The heat of vaporization for the compound is 27.49 kJ/mol. Calculate the heat required to ...
February 2, 2015 by Tori

physics
two girls exeret a force of 30 N and 10 N on a bag in same direction. a dog tugs at bag and drag it in oppsite direction with the force of 5 N. calculate the new force exerted on bag and draw a vector diagram. F= 10+30 = 40 N dog applied force in opposite direction with 5 N ...
December 21, 2014 by ruby

physics
Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? Choose one answer. a. The waves must have the same wavelength. b. The waves must have a constant phase difference. c. The waves must have the same amplitude. d. ...
April 17, 2011 by ashley --

statistics
A pilot study has revealed a sample standard deviation of 16 for age of people in the work force. How large a sample must be chose to obtain an estimator of the mean that, with 95% confidence, will be correct to within 2 years?
March 20, 2009 by Sally

Physics
The 3.1 , 38-cm-diameter disk in the figure is spinning at 310 . How much friction force must the brake apply to the rim to bring the disk to a halt in 2.6 ? Express your answer using two significant figures.
November 13, 2012 by Amy

Physics
How many grams of ice must be added to 100 grams of water at 60 degrees so that its temperature drops to 20 degrees celcius? As far as i know I have to use: (Mass)*(specific heat of water) *(finaltemperature - initial temperature = ??
January 7, 2010 by Jose

Physics
A man is pulling on a rope with a force of 97 N directed at an angle of 68 degrees to the horizontal. What is the x-component of this force? What is the y-component of this force?
September 11, 2011 by Milan

Trig
Force 1= 65 pounds , Force 2=90 pounds find the angle between the forces? magnitude of the resultant force= 70lbs
April 16, 2014 by Anonymous

Physics
Suppose you are getting ready to take a nap, and you have a choice of lying stretched out on your back on a) a bed of nails, b) a hardwood floor, or c) a couch. Which one would you choose for the most comfort, and WHY?
May 15, 2012 by Bob

TRIGONOMETRY
Because of the wind, a boat sails 4,728 meters in the direction S 47deg29mins W. How far south it goes? How far west has it gone? this is my report..please help me..i tried so hard but i really didn't get it..thanks!
August 6, 2010 by Winsel

English
i have to right a short story with characeristics from the romantic period.. main character has to be form the book the crucibe... setting must be in nature hero must have supernatural powers...characters must be free spirited playful emotional and archetypes must be clearly ...
October 8, 2008 by AMANDA!!!!

Physics
A 2000 kg car is slowed down uniformly from 18.0 m/s to 5.00 m/s in 4.20 s. (a) What average total force acted on the car during that time? (b) How far did the car travel during that time?
October 5, 2012 by Dee

Chemistry PLEASE HELP!
Check all of the following statements which are TRUE for a titration. Select one or more: a. A suitable primary standard must be available. b. The concentration of the solution in the buret (the titrant) must be known before the titration is begun. c. Titrations can only be ...
May 5, 2013 by Sophie

Chemistry Hess's Law
(1) 2 Ni(s) + O2 (g) --> 2NiO(s) delta H= -479.4 kJ (2) Ni(s) + Cl2(g) --> NiCl2(s) delta H= -305.3 kJ Using equations 1 and 2 and Hess's Law, determine the amount of moles Nickel (ii) Chloride that was combusted given the following: volume = 15.45 L pressure = 2.29 atm...
October 23, 2013 by Brian

math
Assume the brakes of an automobile produce a constant deceleration of k ft/sec^2. Determine what k must be to bring an automobile traveling 60 mph to a rest in a distance of 100 ft from the point where breaks are applied? With the same k, how far would a car traveling 30mph ...
April 15, 2015 by Barry

english
what are some poetic devices used in the following poem? "Mending Wall" by Robert Frost Something there is that doesn’t love a wall, That sends the frozen-ground-swell under it And spills the upper boulders in the sun, And makes gaps even two can pass abreast. The work of ...
November 7, 2010 by Rebecca

physics
A rope of mass 0.78 kg is stretched between two supports 31 m apart. If the tension in the rope is 1800.0 N, how long (in seconds) will it take a pulse to travel from one support to the other
May 3, 2012 by jessica

Math
An exponential function with a base of 3 has been vertically stretched by a factor of 1.5 and reflected in the y-axis. Its asymptote is the line y=2. Its y-intercept is (0,3.5). Write an equation of the function and state its domain and range.
April 26, 2014 by Han

Physics
I got two questions Three blocks on a fricitonless horizontal surface are in contact with each other a force F is applied to block 1 mass m1 Draw a free body diagram for each block ok done the accelration of the system (in terms of m1, m2, and m3) ok done I got a = (m1 + m2 + ...
July 12, 2009 by Physics

Physics- LOST!
If the air temperature is the same as the temperature of your skin (about 30.0 C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70.0 kg person's body produces ...
December 3, 2007 by Jamie

Physics
A 3.0 kg block is moved up a 37 incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
May 7, 2014 by Andrew

Hard Math
Why are these poor models for a parabola, Where a ball starts a a certain point and then is hit to reach a maximum height (vertex) and then lands at a certain point i. y = -0.002x(x - 437.1) ii. y = -0.5x + 216x + 3 iii. y = -0.002x + 0.879x + 3.981 iv. y = -0.002x + 0.8732x...
January 24, 2012 by Ajunb

Physics
It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. Part A How far would you have to drill ...
November 16, 2012 by Kaan

Chemistry
What is the lattice energy of NaH? Use the given information below: Heat of formation for NaH = -56.442 kJ/mol Head of sublimation for Na = 107.3 kJ/mol Ionization energy for Na = 496.00 kJ/mol Bond dissociation energy for H2 = 435.9kJ/mol Electron affinity of H = -72.8
December 7, 2009 by ChemProblem

Chemistry
What is the lattice energy of NaH? Use the given information below: Heat of formation for NaH = -56.442 kJ/mol Head of sublimation for Na = 107.3 kJ/mol Ionization energy for Na = 496.00 kJ/mol Bond dissociation energy for H2 = 435.9kJ/mol Electron affinity of H = -72.8
December 7, 2009 by LatticeEnergy??

physics
A ball is dropped from 1.5 m and rebounds to 1.2m. How many times will it bounce before losing 90% of it's energy? I assumed energy was hight times gravity so when the rebound was only 10% of the original amount, 90% of the energy is lost. Is this the correct idea? I ...
March 20, 2011 by Mark

Physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
March 3, 2014 by Anonymous

physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
March 3, 2014 by Anonymous

Physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
March 4, 2014 by Anonymous

PHYSICS
Find the force on a proton, with kinetic energy 10keV, that is moving perpendicular to a magnetic field of magnitude 2.0kG. I know I need to find the velocity, and then use F=qvBsinTHETA, but I'm so bad at equating different parts of formulas. Can anyone tell me what to do ...
November 29, 2010 by Trace

physics
A box of Cheerios and a box of Wheaties are accelerated accross a horizontal force vector F applied to the Cheerios box. THe magnitude of the frictional force on the Cheerios box is 2 N and the magnitude of the frictional force on the Wheaties box is 4 N. If the magnitude of ...
November 27, 2006 by Bri

Math/Physics
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 charge inside or outside ...
October 30, 2014 by Kim

English
Correct the incorrect punctuation and type a semi-colon, colon, em dash, or parenthesis. What can be done about pollution? I know what I must do(and will do--to help reduce pollution. Although, the way I see it, there are at least three things we all should do; (1) recycle ...
February 8, 2010 by Pam

Quantum Physics
Each element has a different set of energy levels. Use this fact to "explain" whay the colour of the light emitted by an element in the gaseous state is characteristic of the element. When an electron falls from one of the higher energy levels to a lower energy level, light is...
March 6, 2007 by Grant

Physics
Sukey is riding her bicycle when she sees a fallen tree 42 m ahead. If the coefficient of friction is .36 and she is travelling at 50 km/ hr and she and the bike have a mass of 95 kg, how much stopping distance does she need. I got as far as her speed equals 13.9 m/sec. Do we ...
November 19, 2012 by lizgreene52

Physics Constant Force question help.
A constant force acting on body mass 5 kg changes its speed from 2 m/s to 7 m/s , the direction of motion remains unchanged, find FORCE. answer is 2.5, but help me solve it, thanks
October 2, 2014 by Shahab Mirza

physical science
An input force of 20 newtons is applied to a lever at a distance of 2 meters from the fulcrum. An object 0.5 m away from the fulcrum (and on the other side) is lifted by the 20-N force. What is the output force? A. 10 N B. 20 N C. 40 N D. 80 N
June 16, 2015 by tetianna

physics
A proton is acted on by an uniform electric field of magnitude 233 N/C pointing in the positive x direction. The particle is initially at rest. (a) In what direction will the charge move? (b) Determine the work done by the electric field when the particle has moved through a ...
March 29, 2015 by mathew

chemistry
Many ionic compounds have high melting points because a lot of energy is required to break the strong ionic bonds. So after breaking the ionic bonds, the ionic compound becomes a liquid. How do you explain why the ionic compound also has high boiling point?
April 4, 2009 by jess

Physics
A charge q =+ 4.11 x 10 - 9 C is placed at the origin, and a second charge equal to -2q is placed on the x axis at the location x = +1.00 m. (a) Find the electric potential midway between the two charges. (b) The electric potential vanishes at some point between the charges. ...
July 15, 2011 by Chloe

bio stats
After a winter ice storm, 25 parrots are found sheltering in a tool shed. Ana traps the parrots, weighs them (average weight = 36 grams) and then feeds them. The next morning she find that 6 of the parrots have died. She weighs the dead ones (average weight = 20 grams) and the...
April 26, 2009 by Frank Minimi

health care finance
St. Luke’s Convalescent Center has $200,000 in surplus funds that it wishes to invest in marketable securities. If transaction costs to buy and sell the securities are $2,200 and the securities will be held for three months, what required annual yield must be earned before the...
July 27, 2014 by Anonymous

Physics
Suppose 0.015 kg of steam (at 100.00 °C) is added to 0.20 kg of water (initially at 14.0°C). The water is inside an aluminum cup of mass 40 g. The cup is inside a perfectly insulated calorimetry container that prevents heat exchange with the outside environment. Find the final...
December 8, 2014 by Anonymous

Physics
A stationary arrangement of two crayon boxes and three cords. Box A has a mass of 11.0kg and is on a ramp at angle č=30.0 degrees; box B has a mass of 7.00 kg and hangs on a cord. The cord connected to Box A is parallel to the ramp which is frictionless (a) What is the tension...
December 8, 2006 by Carla

science
a piece of furniture that weighs 500 newtons is pushed along the ground for a distance of 10 meters then lifted 2 meters above the ground into a truck. how much work is done if the force required to push the furniture is 150 newtons?
October 24, 2010 by elizabeth

Physics
If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures Is this correct? 0.86*648*9.8= 5...
November 5, 2014 by sarah

English
I'm including part of the poem for you to check. "No Nightingale did ever chaunt more welcome notes to weary bands Of travellers in some shady haunt, Among Arabian sands: a voice so thrilling ne'er was heard In spring-time from the Cuckoo-bird ....." 1) The girl's song is ...
November 7, 2011 by Henry2

Physics -energy
A 80 kg diver steps off a 10 m tower and drops from rest straight down into the water. If he comes to rest 5.0 m beneath the surface, determine the average resistance force exerted on him by the water.
February 18, 2010 by Nate

Chemistry
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____. a) strike the walls of the container with less force b) move faster c) decrease in volume d) decrease in average kinetic energy
April 14, 2010 by Megan

Physics
Doubling the voltage across a parallel plate capacitor does not double which of the following? a. the charge b. the electric field between the plates c. the energy stored d. the electric force on the plates e. both a and b is the answer A if not then how do i do this problem
February 23, 2011 by David

Physics
Doubling the voltage across a parallel plate capacitor does not double which of the following? a. the charge b. the electric field between the plates c. the energy stored d. the electric force on the plates e. both a and b is the answer A if not then how do i do this problem
February 24, 2011 by Anthony

physics
A 20 g bullet is accelerated in a rifle barrel 95.3 cm long to a speed of 801 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.
March 7, 2011 by go

physics
A 20 g bullet is accelerated in a rifle barrel 95.3 cm long to a speed of 801 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.
March 7, 2011 by go

physics
An 18 g bullet is accelerated in a rifle barrel 61.7 cm long to a speed of 362 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N
January 17, 2012 by Domingo

physics
A 22 g bullet is accelerated in a rifle barrel 43.2 cm long to a speed of 907 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N
December 14, 2012 by Patrick

Physics
A 19 g bullet is accelerated in a rifle barrel 70.6 cm long to a speed of 506 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N
February 5, 2013 by Ted

Physics
Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one’s birth. The only known force a planet exerts on objects on Earth is gravitational. (a) Calculate the gravitational force exerted on a 4.20 kg baby by the Earth. (b...
June 8, 2014 by Anonymous

Physics
At a birthday party, a student ate a piece of cake (food energy value of 400 calories). To prevent this energy from being stored as fat, she decides to drink ice water at 0 C. She reasons that the ingested ice water will be warmed up to her normal body temperature of 37 C and ...
May 23, 2012 by Bob

Physic
two rocks of unequal mass have the same kinetic energy and are sliding across a flat, level ice surface in the same direction. If the each is subjected to the same retarding force, how will their stopping distances compare?
January 16, 2011 by Yeldos

Physics
Can anyone help with which formula I should use to solve this: During a head on car crash, the car is designed to slow down as its front end crumples. If a person can survive an acceleration of -33 m/s how far must the front end crumple if the car was initially traveling at 28...
June 17, 2013 by Lynn

science
Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A or B. A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the synthesis of the correct DNA ...
November 20, 2011 by jake

science
Phytoplankton are not the only primary producers in the oceans. true or false I think this is false but am not certain. True. However, the great majority of primary producers is phytoplanton, however, there are sea grasses, and floating seaweed. There is a tiny amount of ...
March 28, 2007 by Suzi

Physics
Cosmic microwave background radiation fills all space with an average energy density of 4 x 10^-14 j/m^3.(a) Find the rms value of electric field associated with this radiation.(b) How far from a 7.5 kW radio transmitter emitting uniformly in all direction would you find a ...
April 17, 2009 by Sandhya

Physics
A 6100 kg rocket is set for vertical firing from the ground. If the exhaust speed is 1200 m/s how much gas must be ejected each second if the thrust a) is to equal the magnitude of the gravitaiotnal force on the rocker and b) is to give the rocket an inital upward acceleration...
February 9, 2007 by sarah

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