# physics-energy conservation

80,878 results

### Physics

Bernoulli's equation is an expression of: the conservation of mass the conservation of total energy the conservation of kinetic energy the conservation of momentum the conservation of velocity My ans: the equation states that it should be a constant when there is a streamline ...

### Physics

A bullet with a mass of 55 grams moving with a speed of 100 m/s slams into and wedges in a 1.9 kilogram block of wood supported by a string initially at rest. Which one, conservation of energy or conservation of momentum, can be applied to this situation? Why? I think it's ...

### Science

The law of conservation of energy states that energy can neither be created nor destroyed. In many instances it may look as though energy is gained or lost, but it is really only changed in form. How is the law of conservation of energy represented when an archer shoots an ...

### Vague Physics

Does anyone know what the laws of conservation are when dealing with resistors? Well, I guess you can vaguely state if you have, for example, 2 resistors in series: then, in accordance with the law of conservation of energy, the voltage drop across each resistor (the energy ...

### physics question

The sum of the emfs and potential difference around a closed loop equals zero" is a consequence of: a) Newton's third law b) Ohm's law c) Newton's second law d) conservation of energy e) conservation of charge For this question: I had picked d conservation of energy but now I ...

### physics

A car is released from rest on a frictionless inclined plane. (Figure: twitpic com/e8nkhj) Calculate the momentum pi at the end of the plane in terms of measured quantities x, y, l, and m. Assume θ is very small so that h/l ~= y/x. (Hint: use conservation of energy and K...

### science

An atom that has the same amount of atoms of each element on both sides of the reaction obeys what law? law of conservation of energy law of conservation of mass law of conservation of temperature law of conservation of atoms I know the Answer law of conservation of mass I ...

### Sci275

I am doing my final project on energy conservation.What are some good resources on energy conservation?

### Conservation of energy

Can someone explain to me what happens when you take a slap shot in hockey according to conservation of energy? I think that when you wind up you have potential energy, then when you swing the stick towards the puck you have kinetic energy, then when the stick flexes you have ...

### Physics

Alcohol flows smoothly through a horizontal pipe that tapers in cross-sectional area from A1 = 41.9 cm2 to A2= A1/3. The pressure difference Äp between the wide and the narrow sections of the pipe is 11.1 kPa. What is the volume flow rate ÄV/Ät of the alcohol? The density ...

### physics

The Bernouilli equation is a statement of which physical principle? Select one: a. COnservation of Momentum b. Newton's Second Law c. Pascal's Principle d. Conservation of Energy

### Physics

Question from lab regarding Conservation of Energy Why doesn't the potential energy of the pulley matter when calculating the change in energy of our system?

### Physics

How do I use Kirchhoff's First Law -- the law of conservation of energy and the law of conservation of charge to prove the equivalent resistance formula. Rt = R1 + R2 + R3 ......

### Physics

We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the universe ...

### Physics

We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the universe ...

### physics

Which of the following statements is a consequence of equation E=mc^2? Energy is released when matter is destroyed Mass and energy are equivalent The law of conservation of energy must be modified to state that mass and energy are conserved in any process all of the above ...

### Physics

A plutonium- 239 nucleus initially at rest undergoes alpha decay to produce a uranium-235 nucleus. The uranium-235 nucleus has a mass of 3.90 x 10^-25 kg and moves away with a speed of 2.62 x 10^5 m/s. Determine the minimum wage electric potential difference that is required ...

### Physics

due to conservation of mass, potential energy should always equal to kinetic energy. one possible reason the calculation for kinetic energy might be less than potential energy is _

### physic

can someone give me 5 examples for the conservation of the angular momentum , 5 for the conservation of the impulse , and 5 for the conservation of the mechanical energy , in sport , arts or in technique , or just give me a site to find these examples, but please xamples must ...

### Physics

A plutonium- 239 nucleus initially at rest undergoes alpha decay to produce a uranium-235 nucleus. The uranium-235 nucleus has a mass of 3.90 x 10^-25 kg and moves away with a speed of 2.62 x 10^5 m/s. Determine the minimum wage electric potential difference that is required ...

### science(physics)

A 2kg stone is droped from the top of a 20m building a)what potential energy does it posses b)At what height does its potential energy become equal to its kinetic energy? c)what is its kinetic energy just before it hits the ground? d)With what velocity does it reach the ground...

### History

Which statement best evaluates the connections between water conservation and land conservation projects? A.Water and land conservation are both nice efforts but have little practical use. B.Water conservation is more important than land conservation because water is scarcer. ...

### Chemistry

The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. definite proportions. B. atomic disintegration. C. conservation of energy. D. conservation of matter. im not sure if its c or...

### Physics - Rube Goldberg Project

I need to make a Rube Goldberg Machine and it must demonstrate projectile motion, conservation of energy and conservation momentum, any idea on what to make and how to make it? Help please

### physics-energy conservation

when you apply the brakes of a car its kinetic energy or energy of motion decreases. a)to what form of energy is the kinetic energy converted? b)where does the resulting energy end up? Do the brake drums on the wheels heat up? so does it convert into heat energy?and the ...

### physics

A 0.200 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (KE/KE) gets ...

### science!

What is the value of resource conservation and what are some strategies for conservation? What are some alternative energy sources that could become more mainstream?

### Geological Science

What is the value of resource conservation and some strategies for conservation? What are some alternative energy resources that could become more mainstream?

### physics-energy conservation

some people refer to heat as "low grade energy. a)how is low grade energy different from high grade energy? b)give two example of high grade energy When heating a cup of tea, which would be preferable...a stove with a burner on top, or a heating pad? High grade energy is ...

### Physics

Blocks of mass m1 and m2 are connected by a massless string that passes over a frictionless pulley. Mass m1 slides on a frictionless surface. Mass m2 is released while the blocks are at rest. The pulley is a solid disk with a mass mp and a radius R. Use conservation of energy ...

### physics

The principle of conservation of heat energy states that

### physics

A cart of mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision the first cart continues in its original direction at .66m/s. a) what is the mass...

### PHYSICS HELP!!

A drop hammer of mass 120 kg falls 2.5 m onto a pile of mass 250 kg and drives it 70 mm into the ground. Calculate: a.The velocity with which the hammer strikes the pile (use the conservation of energy principle) b.The velocity immediately after the impact(use the conservation...

### PHYSICS HELP!!

A drop hammer of mass 120 kg falls 2.5 m onto a pile of mass 250 kg and drives it 70 mm into the ground. Calculate: a.The velocity with which the hammer strikes the pile (use the conservation of energy principle) b.The velocity immediately after the impact(use the conservation...

### Science:Earth Science

Explain how energy conservation can help with decreasing air, water and land pollution. This is an essay question. This is my answer. Answer: Energy conservation can help with decreasing air, water, and land pollution because of the different alternatives we have for energy. ...

### Physics

A boy weighing 40kg runs at 8.0m/s grabs a rope and swings of level ground. What maximum height does the child reach? How do I solve this?? it is under the conservation of energy section of work, power and energy. any help would be great! thanks

### Physics Work and Energy, Momentum

Let g be the acceleration due to gravity at the surface of a planet of radius R. Which of the following is a dimensionally correct formula for the minimum kinetic energy K that a projectile of mass m must have at the planet's surface if the projectile is to escape from the ...

### Physics ~Conservation of Energy~

1.) At one point in its fall, an object (m=2.5 kg.) has a kinetic energy of 5 J(joule) and a potential energy of 10 J. a) what is the total energy of the system? b) what is the velocity at this point? The object continues to another point where its potential energy is 3J(joule...

### PHYSICS

A body of mass 100.0g is attached to a hanging spring whose force constant is 10.0 kN/m. The body is lifted until the spring is in its unstretched state. The body is then released. Using the law of conservation of energy, calculate the speed of the body when it strikes a table...

### sci

You are a board member of your Home Owner’s Association. At your next meeting, your goal is to educate other homeowners about energy conservation. Review the following Energy Resource Plan outline: Introduction: Provide information about why conserving energy is important. ...

### Physics

A force of 800 N stretches a spring a distance 0.200 m horizontally. a) What is the potential energy of the spring when it is stretched 0.200m b) What is its potential energy when it is compressed 5.00cm This is a conservation of energy problems. The potential is elastic and ...

### physic

Can someone give me 4 or 5 examples of the conservation of the impulse in sports and 4 or 5 examples of the conservation of the mechanical energy also in sports

### Physics

How does the conservation of mechanical energy explain why a planet in an elliptical orbit changes speed?

### physics

Two Bals. of masses mA = 45 grams and mB = 65 grams are suspended as shown. The lighter ball is pulled away to a 66 degree angle with the vertical and released: ----------------------------- /| | - /è| | | / | | | 30 cm / | | | mA | | | mA mB - where è = 66 degrees, and the ...

### Physics

Two sources of equal amplitude undergo interference the energy at maxima is four times that due to either source is this a violation of the principle of conservation of energy. Explain. Can someone help me summarize a good model answer and further explanation of the answer? ...

### Physics

Trying to find escape speed from a planet and I am given the radius and gravitational field - g = 18 m/s^2. I have the conservation of energy, final energy is zero, I have the formula for V = sqrt 2GM/r, u = mgy. I have too many unknowns...I can't solve anything. What am I ...

### AP Physics - Work and Energy

A projectile is fired at an upward angle of 45 degrees from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when strikes the ground below? (Use conservation of energy.) I have a diagram of it but I don't know what equations to use. Help?

### physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages.

### Physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages.

### Physics Conservation of Energy

During a rockslide, a 740 kg rock slides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the rock and the hill surface is 0.18. (a) If the gravitational potential energy U of the rock-Earth system is set to zero at the ...

### Physics Conservation of Energy

During a rockslide, a 740 kg rock slides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the rock and the hill surface is 0.18. (a) If the gravitational potential energy U of the rock-Earth system is set to zero at the ...

### physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights and hot water when they are not being used, and keeping thermostats at a moderate level. In this chapter, we also speak of “energy conservation.” Distinguish between ...

### Physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages. Please ...

### science

the law of ? of energy states that energy can never be destroyed or created Law of conservation of energy.

### science

Describe a fourth scenario in which either the Law of Conservation of Matter or the Law of Conservation of Energy could be observed. Using as many sentences as needed, describe how an experiment could be set up to further explore your recorded observation. The goal is to show ...

### Physics - URGENT

A small block of mass 5 kg initially rests on a track at the bottom of a circular, vertical loop-the-loop, which has a radius of 0.8 m. The surface contact between the block and the loop is frictionless. A bullet of mass 0.7 kg strikes the block horizontally with initial speed...

### Physics-half way fin.

A person was shot vertically upward from a cannon with a mass 52 kg and a speed of 35 m/s. a) what was the height according to conservation of energy and b) what was the person's total energy? (TME never changes!) a) used TMEo=TMEf height= 63 m. b.)Would I use PE=mgh

### Physics

Alcohol flows smoothly through a horizontal pipe that tapers in cross-sectional area from A1 = 41.9 cm2 to A2= A1/3. The pressure difference Δp between the wide and the narrow sections of the pipe is 11.1 kPa. What is the volume flow rate ΔV/Δt of the alcohol? ...

### ipc

According to the law of conservation of mechanical energy, if the only force acting on this pendulum is gravity, the total energy of the system is

### Physics

A simple pendulum has a bob of mass M. The bob is on a light string of length l. The string is fixed at C. At position A, the string if horizontal and the bob is at rest. The bob is released from A and swings to B, where the string is vertical. The tension in the string when ...

### physics

A 0.240 kg ball moves at a speed of 3.0m/s strikes a wall and bounces straight back at 2.40m/s. The collision lasts 0.0150s. How much kinetice energy in joules is lost during the collision? Wouln't you just subtract the final KE from the initial KE? That is my understanding of...

### Physics

A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not.

### Physics

A 64.1-kg athlete leaps straight up into the air from a trampoline with an initial speed of 7.4 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. Write the general equation for energy conservation and solve for the ...

### Physics

A 3.4 kg mass is shot by a sling shot with an initial velocity of 4.5 m/s. When the mass is in the air at a height of 50m, it is still traveling upwards. What is its velocity at that height? Draw energy pie graphs for the initial and final state. (Hint: You will have to use ...

### new Q science

Give an example of how you've seen the law of conservation of matter in action today. Since we don't know what "you've seen," it is impossible to answer this question. You need to review the law of conservation of matter in your textbook to compare your experiences. However, I...

### physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights and hot energy,” by which we mean turning off lights and hot water when they are not being used, and keeping thermostats at a moderate level. In this chapter, we also ...

### physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights and hot energy,” by which we mean turning off lights and hot water when they are not being used, and keeping thermostats at a moderate level. In this chapter, we also ...

### SCIENCE .

why conserving energy is important? What can each person do to conserve energy and help the environment at the sametime? (Provide at least three methods) How can the government be involved in conservation efforts?

### Physics

A 500.0 g bird is flying horizontally at 2.25 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it two-thirds of the way up from the bottom. The bar is uniform and very thin, is 0.750 m long, has a mass of 1.50 kg, and is hinged at ...

### physics-energy conservation

a mordern power station,or, more correctly, an energy station, converts heat energy into electrical energy at an efficiency od 50% if the station produces electrical energy at a rate of 1.00GW from burning coal, calculate the mass of coal it burns each day. the coal it uses ...

### Physics

The Roller Coaster interactive is designed to give users an entertaining way of examining the principle of Conservation of Energy. Build your roller coaster, let it go, and watch the interplay between potential and kinetic energy. See if you have what it takes to build a ...

### physics

A 17.0 kg child travels down a playground slide 3.50 m high and reaches the bottom with a speed of 2.50 m/s. How much heat was generated due to friction as a result of this process? my teacher hadn't taught anything about heat..but he did give us this question, thus, i got no ...

### Physics

To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages. Please ...

### physics

suppose the diver vaults off the springboard, leaving it with an initial speed of 3.50 m/s upward. use energy conservation to find his spped when he strikes the water.

### Physics

Two particles A and B has the same mass and are being kept on a rough horizontal table "d" distance apart.B is kept still and A is given a velocity of u towards B.After the collision,if A comes to its previous point show that, u^2 = 2agd[1+(1/e^2)] a- coefficient of friction I...

I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved but then when ...

### English

I have an test on these and I do not want to fall the test. Please tell me a ways I can study, online tests etc so that I can pass it. Thank you and I appreciate for your help! They are: They will be fill in the blanks, multiply choices. (1)Petroleum (2) Solar Energy resources...

### science

how should each form of energy be identified? A) energy A:gravitational energy /energy B:chemical energy B) energy A: nuclear energy/ energy B: electrical energy C) energy A: electromagnetic energy energy B:sound energy D) energy A: mechanical energy /energy B: thermal energy

### biology

Apply the Law of Conservation of Energy to food. Trace the energy from its beginning point, to the point where it was stored or used.

### physics

A rocket is fired upwards with 200.0 J of kinetic energy. How high does the rocket get at its highest point? Use the conservation formula.

### Physics

A ball is thrown straight up in the air at an initial speed of 30 m/s. Using conservation of energy, find the maximum height of the ball.

### mechanics

A string is wound around a uniform disk of radius R and mass M. The disk is released from rest when the string is vertical and its top end is tied to a fixed bar. (a) Draw a free body diagram indicating all the forces acting on the disk. (b) Calculate the acceleration of the ...

### SCI 275

distinguishes between renewable and nonrenewable energy. · provides at least three methods for conserving energy and helping the environment. · discusses how the government can help with conservation efforts. I need help PLease

### Physics

Pretend the hot brick extracts heat from the cold brick and becomes hotter. Would this violate the Law of Conservation of Energy?

### Physics

A salami sandwich is dropped from the top of a 37 m tall construction crane. What is the speed of the sandwich when it is halfway to the ground? (Use conservation of energy!)

### Physics

A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not. I truly don't know what this means at all...can someone help me understand it?

### Environmental Science

True or False 30. Three alternative energy sources are tidal power, ocean thermal energy conservation (OTEC), and hydrogen. True

### Environmental Science

True or False 30. Three alternative energy sources are tidal power, ocean thermal energy conservation (OTEC), and hydrogen. True

### Science Help

Which of the following statements describes the conservation od a natural resource? A. A factory burns coal to run its machines. B. A solar energy company harvests energy from sunlight. C. Lights in a house are turned off when not in use. D. A wind energy company covers a ...

### Physics Problem

A 3.00-kg mass is fastened to a light spring that passes over a pulley. They pulley is frictionless, and its inertia may be neglected. The mass is released from rest when the spring is unstretched. If the mass drops 10.0cm before stopping, find (a) the spring constant of the ...

### physics

I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the following statements is ...

### Physics

A 3.60 kg block starts from rest and slides down a frictionless incline, dropping a vertical distance of 2.80 m, before compressing a spring of force constant 2.30*10^4 N/m. Find the maximum compression of the spring. Any help would be appreciated, this problem is to use ...

### physics

A stone is thrown vertically upward. On its way up it passes point A with speed, v and point B, 3 m higher than A, with speed 1/2v. Calculate a) the speed v and b) the max height reached by the stone above point B. I can't find the equation You need to derive the solution in ...

### Physics

Hello, I have a question and I would like to know if anyone can help me. Well I was reading about the motion of an ideal "yo-yo" and I found that mechanical energy is conserved, but there´s something that I don´t understand and it´s about the work performed by the tension. ...

### Physucs

A clerk pushes a filing cabinet of mass 22.0 kg accross the floor by exerting a horizontal force of magnitude 98 N. The magnitude of the force of kinetic friction acting on the cabinet is 87 N. The cabinet starts from rest. Use the law of conservation of energy to determine ...

### Physics

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity of non-kinetic ...

### Physics

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity of non-kinetic ...

### Physics

I'm not sure how to do this problem A .40 kg ball is thrown with a speed of 10 s^-1 m at an angle of 30 degrees. (a) What is its speed at its highest point, and (b) how high doe it go? (Use conservation of energy.)

### Physics

True or False: If a cannon fires a cannonball in an easterly direction, the tendency of the cannon to move to the west is a result of the principle of conservation of energy.