# physics please HELP !

128,545 results, page 68

### PHYSICS (please help)

Three masses are connected by a string. M1 = 1.0kg M2 = 2.0kg M3 = 3.0kg Mass one and two are on a table while mass three hangs off the edge of the table (there is a pulley). Find the tension in the string connecting m1 and m2. Assume the table is frictionless and the masses ...

### physics

Please see if I am doing this problem right. A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4 X 10^-3 m^2 and is displaced inward by 7.2 X 10^-2 M. If 9.5 X 10^5 Pa of pressure is placed on the piston, how much work is done ...

### Physics

We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Typically, only about 5% of the energy goes to visible light; the rest goes largely to non-visible light infrared radiation. (a) What is the visible light intensity (in W/m^2) at the surface...

### Physics. Please help

A 3.00 kHz tone is being produced by a speaker with a diameter of 0.175 m. The air temperature changes from 0 to 29°C. Assuming air to be an ideal gas, find the change in the diffraction angle My solution v directly proportional to sqrt T v = sqrt 302 =17.382 lambda = v/f = ...

### Please physics help

A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision...

### Physics

A 0.142 kg remote control 24.0 cm long rests on a table, as shown in the figure(Figure 1) , with a length L overhanging its edge. To operate the power button on this remote requires a force of 0.355 N . How far can the remote control extend beyond the edge of the table and ...

### Physics

A flat (unbanked) curve on a highway has a radius of 200 m. A car rounds the curve at a speed of 26.0 m/s. What is the minimum coefficient of friction that will prevent sliding? Our professor didn't even go over this, and it is way more complex than anything in the book. Plus...

### Physics waves- help please

A police officer with good ears hears an approaching motorcycle. The engine sound he eats as the bike approached is 195 Hz. a) Is the actual sound the bike makes higher or lower in pitch? b) After the bike passes he hears 147 Hz as the perceived pitch. If it was a nice 20 ...

### Physics

In one of your rigorous workout sessions, you lost 140 g of water through evaporation. Assume that the amount of work done by your body was 3.8 105 J and that the heat required to evaporate the water came from your body. (a) Find the loss in internal energy of your body (due ...

### Physics, 4 short questions

VERY IMPORTANT FOR AN ESSAY ASSIGNMENT. PLEASE HELP ASAP! THANK U VERYYYYY MUCH! 1. What force is needed to give a mass of 25 kg an acceleration of 20m/s squared? 2. A force of 6N acts upon a 2-kg mass. What is the acceleration of the masS? 3. It takes a force of 50N to give a...

### Algebra

Please help me solve this problem the kinetic energy (k) energy of a moving object with varies jointy with it mass (m) and the squareo of its velocity (v). If an object has an mass of 22.5 kilograms and moving with a velocity of 20 meters per secomd has a kinetic energy energy...

### PHYSICS

An ice chest at a beach party contains 12 cans of soda at 2.69 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.05-kg watermelon at 24.1 °C to the chest. The specific heat capacity of watermelon is nearly the same ...

### Physics (please help!!!!)

A cart running on frictionless air tracks is propelled by a stream of water expelled by a gas-powered pressure washer stationed on the cart. There is a 1.00-m^3 water tank on the cart to provide the water for the pressure washer. The mass of the cart, including the operator ...

### Physics (please help!!!!)

A cart running on frictionless air tracks is propelled by a stream of water expelled by a gas-powered pressure washer stationed on the cart. There is a 1.00-m^3 water tank on the cart to provide the water for the pressure washer. The mass of the cart, including the operator ...

### Algebra-please check

Could someone please check my solution-Thank you-DRWLS helped me set it up and I solved it, I think From the top of a mountain 150 feet high, Jessie stands at the safety rail on the edge and looks below. The angle of elevation from his bike on the ground to Jessie is 38 ...

### Physics

In a physics experiment with an inclined air track, what do you predict about the following: a) Position graph b) Velocity c) Acceleration My ans: For a i predicted there would be a curve and i didn't know why b) velocity will decrease with time but why? c) acceleration is 0 m...

### Physics

solve physics question. a train moves 3.6km from rest to rest in 3minutes. the greatest speed is 90km/h, and the acceleration and retardation are uniform. find the distance travelled at full speed.

### Physics

In our physics class we launched a rocket up into the air. We measured the time it took to go up to the point it reached the ground once again. How do I find the maximum height the rocket reached?

### Physics

PHYSICS HELP PLS!!How does the equation of a displacement v. speed graph (cart moving down an incline through a speed gate) relate to the work-energy principle. Pls answer asap! Thanks!

### Physics - Electric force, field, and potential

A 2μC charge is positioned at x = -0.8m and another 2μC charge is positioned at x = 0.8m. A positive test charge of q = 1.28*10^-18C is positioned at the origin x = 0m. Find (a) the electric force exerted on q, (b) the electric field at the origin, and (c) the electric ...

### Physics please help ASAP!

If you know the mass of a star and a planet’s radius and speed at perihelion (closest approach to the star), then using conservation of energy and angular momentum you can solve for the radius and speed of that planet at aphelion (farthest point from the star). Encke’s ...

### physics

a race car completes 10 laps around an oval track. which of the following pairs of quantities concerning its motion would both have values of zero? a)displacement, avg velocity B)avg speed, avg acceleration c)distance, avg speed d)avg speed, avg velocity e) displacement, avg ...

### Sociology

Please help me on this question. I am very stuck! 1. Prepare a chart which compares the basic characteristics of the pure capitalist and pure socialist economic models. Please help me; compare characteristics of pure capitalist and pure socialist. Thanks

### Government

I am working on a test review for Gov't and I cant find any information whatsoever in the text book. The question is... Identify and explain why the following is important... 2. Events leading to the American Revolution: French & Indian War, Albany Plan, Stamp Act Congress, ...

### please help math

$9500 is invested, part of it at 12% and part of it at 7%. For a certain year, the total yield is $960.00. How much was invested at each rate? PLEASE HELP

### physics

an 6lb object is hanging from a 10lb object which in turn is hanging from a ceiling. need to find tension(T1) of rope from ceiling to 10lb object and tension(T2) from the 10lb object to the 6lb object. please, need assitance in trying to set up the problem. thanks Tension is a...

### physics

I keep geting this question wrong and cant figure out what i am doing wrong. Help please. When you push a 1.75- book resting on a tabletop, it takes 2.23 to start the book sliding. Once it is sliding, however, it takes only 1.45 to keep the book moving with constant speed. ...

### PHYSICS Urgent help please

A red ball is thrown up off the edge of a building 10 m tall with an initial speed of 4 m/s. A) how long does it take for the red ball to strike the ground below? B) If a black ball is dropped off the edge of the same building, how many seconds after the release of the red ...

### physics

in low temperature physics,at joule thomson effect hydrogen does not show cooling effect at room temperature why?

### Physics

Physics :adaobi walked 2km due west and then 2km due south. Calculate the displacement of the girl.

### science

2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...

### Please check-Reiny

Could you check these two problems? 3sqrt (y+2) = 3 is y = 25 Answers were: true or false I said true because I did it like this Square both sides=y + 2 = 3^3 y+2 = 27 y = 25 and sqrt (2y-6) = 3-y for y answes are: no solution 5 3,5 3 I said 3 because I did it like this: 8y -...

### Math-PLEASE help!!

An executive committee of three is selected from a group of ten. Which expression best describes the number of combinations? These are my choices. I have to have one of these as the answer. I am stuck. My answer was B. 10!, but I am still not sure. Can anyone help me please? A...

### Algebra 2

Solve and Graph: ( i know that second part would be difficult but can you possibly explain it more) -3©¦x+4©¦-5 ¡Ý 10 Please explain. I would really appreciate it. I'm not in school, i'm homebound and mom will not allow me to attend tutuoring at school for help even ...

### Math - Literal Equations

Please help me with the following: The volume of a prism is found by multiplying the area of the base by the height. A rectangular prism has a volume of 144cm^3, and a square base with a width of 3 cm. What is the height of the prism, in cm? A. 4 B. 8 C. 48\ ......--Both of ...

### Physics..an electric field

4 charged particles are at the cornedrs of a square of side a as shown. a) determine the magnitude and direction of the electric field at the location of charge q b) what is the total electric force exerted on q? basically picture is like this below It's a square with 4 ...

### college physics

A 915 kg two-stage rocket is traveling at a speed of 5.50×10^3 m/s with respect to Earth when a pre-designed explosion separates the rocket into two sections of equal mass that then move at a speed of 4.00×10^3 m/s relative to each other along the original line of motion. ...

### Physics

In a cathode ray tube, a beam of electrons is injected horizontally into the exact center of the parallel-plate region. Here L = 3.0 cm and d = 0.20 cm. The top plate has a surface charge density of σ0 = +0.15 μC / m2, and the bottom plate has a surface charge ...

### physics help please

Considerable scientific work is currently underway to determine whether weak oscillating magnetic fields such as those found near outdoor power lines can affect human health. One study indicated that a magnetic field of magnitude 1.0 10-3 T, oscillating at 60 Hz, might ...

### Physics

Two masses m are attached to two vertices of an equilateral triangle made of three massless rods of length l. A pivot is located at the third vertex, and the triangle is free to swing back and forth in a vertical plane. If it is initially released from rest when one of the ...

### Math Breakdown/ please help!!

WAGE---$ 17.00-an hour---------ANUALLY---28,285.28 APARTMENT VALUE 17.34hrs/pay period towards an apartment value of $934/month----ANUALLY---$11,208----TOTAL-------$39,493.28. My question is: first of all, I get, 17X40= $2,720-not 28,285.28, above. ALSO, I am trying to break ...

### physics

A space station shaped like a giant wheel has a radius of 1.00 x 10^2 m and a moment of inertia of 5.00 x 10^8 kgm^2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1.0g. When 120 people move to the center ...

### physics (Simple harmonic motion)

In a horizontal block-spring system,the block mass is m=0.5kg and the spring constant is k =2N/m. At t1=0.1s the block velocity is +0.263m/s and the acceleration is -0.216m/s2. Assuming that the system is undergoing SHM.Write the expression for block displacement from ...

### Physics...Equilibrium (physics of a clothesline)

A clothesline is attached to two fixed ends which are 10.0m apart. A pulley of mass 40.0kg hangs freely in the middle of the line. The sag at the centre is 0.20m. Find the tension in each half of the clothesline.

### physics

NEEDS HELP PLEASE!! A 100kg shot putter is putting a shot 4kg. Just before he releases the shot, he is in the air (feet are off the ground). At this instant, the only force he exerts against the shot is an 800N horizontal force directed forward. a-what is his horizontal ...

### math30

A sequence has a first term of 24 and every other term is one half of the previous term. Find a recursive formula that defines this sequence. The answer of this question is: an=an-1*1/2 Somebody can help me and let me know why is 1/2 on the formula? please please!!! I am not ...

### U,S History

Please help me! I am writing this article. It is an article prior to the attack on pearl harbor. I have to choose if 1) the u.s should enter the war and help the allies or 2) The U.S should remian neurtral in world affairs and stay out of the war. I chose number 2 and I need ...

### Maths

Please help with these questions: (please show how to do) 1. How many differently shaped rectangles, with positive integer dimensions, have a perimeter equal to their area? 2. Let x be any number less than one, and let y be any number greater than one. S= x + y P= xy Prove ...

### Social Studies

What percentage of the world's earthquakes and active volcanoes occur on the "Ring of Fire"? 1) *10% 2) *20% 3) *50% 4) *80% My Answer. Is It Correct? Please Be Honest. #4: 80% The name of Earth's single, huge continent from over 250 million years ago is 1) *Mega-land. 2) *...

### History

The questions below I am asking just to get an idea of what to write. 1. Why was the migration of the Aryans to India significant? 2. What do many of the political conflicts in South Asia have in common? 3. Why is the population of South Asia a concern for the region? Please ...

### Social studies

Anyone Please help me cause i am out of ideas and i have no more ways to turn to help me get the answers to this test please i need this grade I have unsupportive parents and ms sue i appreciate everything u do but dont answer if u arent going to goive me answers if anyone ...

### Math

Please help me with the following by checking my answer. The length of the hypotenuse of an isosceles right triangle is √6 inches. How long, in inches, are the legs of the triangle? A. 3 B. 6 C. √3 - (This is my answer.) D. √6 I am not sure on my answer, ...

### SOCIAL STUDIES

I need to know about current events happening in France. Please list some current events or give me some helpful sites. Thanks!!!:):):):):):):) (GuruBlue the site you gave me didn't work instead it brought me to google so please try giving me HELPFUL sites)Thanks!!!!!!!!

### HISTORY

Respond by explaining how the Berlin Wall did or did not reflect the policy of containment. Berlin Wall, U.S. Response A. Definition/description B. Background information/rationale C. Why it is or isn’t part of the policy of containment Please help! Please don't include ...

### math please help imedietely

The ice-cream cone wrapper is having the flat side on the top and the point at the bottom. Draw the shape of this ice-cream cone wrapper when it is slit from the edge to the center point and flattend out. Please tell answer and explain

### chemistry

at a given temperature and pressure 20ml of the gas diffuses through a porous membrane in 5 seconds. calculate the volume o carbon dioxide which diffuses in 10 seconds if the vapour density of the gas is 11 a)10√(2) b)20/√(2) c)40√(2) d)10/√(2) correct ...

### Physics help please!

The engine has an efficiency e1. The engine takes input heat Qh from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine, which has an efficiency e2 and delivers work W2. The overall efficiency of the two-engine ...

### physics

A wheel's uniform angular acceleration is constant. Initially its angular velocity is zero. During the first 1.0 s time interval, it rotates through an angle of 90.0°. (a) Through what angle does it rotate during the next 1.0 s time interval? (b) Through what angle during the...

### Math (PLEASE HELP!!)

Through how many degrees does the hour hand move... 1. In 3 hours? 2. In 2 hours?___________ 3. In 1 hour?___________ 4. In 1/2 hour?____________ 5. In 10 minutes?___________ Please Help!! Thank You!!

### Math please explain!!

A student got 80 percent problems correctly which is 32 problems correct. how many problems are they in total? I got 40 in a page but it did not explain can you PLEASE EXPLAIN!!!!

### physics

Fred the otter climbed to the top of an inclined plane. His friend, Giselle the giraffe, suggested that he was so small that gravity would ignore him and he would be unable to slide down. "On the contrary", said Fred, "Since this slope makes an angle of 48.4 degrees with the ...

### physics

Fred the otter climbed to the top of an inclined plane. His friend, Giselle the giraffe, suggested that he was so small that gravity would ignore him and he would be unable to slide down. "On the contrary", said Fred, "Since this slope makes an angle of 48.4 degrees with the ...

### Acceleration physics

1. A sprinter finishes the race with a velocity of 8.9 m/s. the sprinter accelerated to a stop at a rate of -2.7 m/s2. how long did it take the sprinter to come to a stop? 2. A cycllist starts from rest & reaches a velocity of 18 m/s southwest in 3.8 seconds. what was the ...

### physics

A monoatomic ideal gas has Cp= 5R/2 a) four moles of the gas undergoes a process in which the temperature of the gas increases from 300 K to 500 K while the pressure is kept constant at 2.00 x 105 Pa. What is the change in the internal energy of the gas? b) Four moles of the ...

### Math

If you are standing near the edge of the top of a 200 feet building and throw a ball vertically upward it will be modeled by the function s(t)=-16t^2+64t+200 where s(t) is the ball's height above ground in feet and t is seconds after the ball was thrown. A) When does the ball ...

### Math

If you are standing near the edge of the top of a 200 feet building and throw a ball vertically upward it will be modeled by the function s(t)=-16t^2+64t+200 where s(t) is the ball's height above ground in feet and t is seconds after the ball was thrown. A) When does the ball ...

### physics......PLEASE HELP!!

A steam engine absorbs 1.98*10^5 J and expels 1.49*10^5 J in each cycle. Assume that all of the remaining energy is used to do work. a. What is the engine's efficiency? b. How much work is done in each cycle? If a gasoline engine has an efficiency of 21 percent and loses 780 J...

### chemistry/physics

i need to determine how many protons, neutrons, and electrons are in these but they arent just straight elements tehy are singly ionized hydrogen (positive) doubly ionized hydrogen(positive) and singly ionized oxygen (negative) these are my answers, respectively 1. one proton ...

### Physics

In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...

### Physics

In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...

### Physics

In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...

### Physics

In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...

### Health insurance please check answer

please check my answer thank you very much :) Which health insurance program is designed to complement the retirment survivor , and disability insurance enacted under the Title II of the Social Security Act? I think the answer is Medicare

### MATH PLEASE SHOW WORK

Three consecutive odd intergers are such that the sum of the squares of the first two integers is 54 more than 20 times the third integer. Determine the three integers. Please help and show all work thank you SHOW WORK SO I UNDERSTAND HOW TO DO IT THANK YOU

### physics

A pigeon in flight experiences a force of air resistance given approximately by F=bv2, where V is the flight speed and B is a constant. A) In terms of SI units, what are the units for the constant "b"? B) What is the largest possible speed of the pigeon if its maximum power ...

### Physics

Please show how you got the answers, not just the answers. A 40.0 N force stretches a vertical spring 0.250 m. (A) What mass must be suspended from the spring so that the system will oscillate with a period of 1.0 s? (B) If the amplitude of the motion is 0.050 m and the period...

### math

beads for sale: 12 cents for 15. Write an equation relating the cost (c) and the number of beads (n0 for the beads. Katie or Halida or whoever, Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your ...

### Physics-Please help

Have 2 identical cars each 1000kg at a speed of 20m/s. The yellow car is stopped by car's brakes in 25m while green car is stopped by concrete barrier in 1.2m. Drivers have same mass(70kg) Driver of yellow car is stopped by seatbelt in 0.150 sec. Compare impulse they received ...

### physics 12U

A driver parks his car on a hill but accidently leaves it in neutral. The car starts from rest and accelerates down the 45 m long hill. It take the car 12.3 seconds to reach the bottom of the hill. a) What is the final velocity of the car at the bottom of the hill? (ANS: 7.3 m...

### physics (PLEASE READ)

referring to the previous problem, if you had entered the same sandy patch with a lower speed, say 7.0 m/s, would the patch have the same effect on your speed, say 7.0 m/s, would the patch have the same effect on your speed? that is, assuming the sandy patch causes the same ...

### physics

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...

### physics

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...

### physics help!

A small 520-gram ball on the end of a thin, light rod is rotated in a horizontal circle of radius 1.5 m. Calculate the moment of inertia of the ball about the center of the circle. Then calculate the torque needed to keep the ball rotating at constant angular velocity if air ...

### Physics

One end of a cord is fixed and a small 0.470-kg object is attached to the other end, where it swings in a section of a vertical circle of radius 2.50 m as shown in the figure below. When θ = 21.0°, the speed of the object is 4.70 m/s. At this instant, find each of the ...

### As physics

Image with a flat horizontal line with a curve on top (beg curve: X, top middle curve: Y, End bottom curve: Z) Describe how the vertical component of the velocity of the water varies form point X to point Z? Mark scheme Answer: decreases from x to y DON’T GET I thought it ...

### Physics

Reposted under Physics... I've tried for hours to solve for v, but can't get the rearranging right. I'm using L= Lo sqrt 1- v^2/c^2 Can anyone suggest the first couple of steps? I can get the answer by the way, by substituting values 'til I get the contracted length. Original ...

### Physics

I am totally new to physics. We are working on summation of moments and I just am not grasping this. I know the formular is M=dF, but his does not help me. I get confused about the middle of settig of euation. I am never sure which distance I should be using. Is there a step ...

### prefixes please help thax:]

these words wont show the right def. when i type it in the dictonary search bar **but i do no u ladys can not do my work for 4 sure But really need help badly i have 11-30 to do and its 9:30 please help anyone thax:] *prefixes* ante arch bi demi equi extra non omin ortho semi...

### English

Can you please check if everything is OK, please? Thank you 1) At first, the three witches prophesy to Macbeth that he will be Thane of Cowdor and then king of Scotland. In the fourth act they tell Macbeth to beware of Macduff. 2) They also tell him that no man born of woman (...

### math help please

two cards are dealt in succession from a standard deck of cards. what is the probability that the second card is red give that the first card was a heart. so i do p(R/H), then i know you go R*H/H. but how do i get the probability please explain! thanks. if 2 dice are rolled, ...

### Calculus! Please Help!!

The dollar value of a stock x weeks after a change in management is give by the function: f(x) = x²-14x+30ln(x+1)+32, 0≤x≤7. Find the intervals when the value of the sock was increasing and also determine the maximum value of the stock during this time. PLEEASEE ...

### Urgent need help on chem please someone

A researcher explores the ideal gas equation. He measures the pressure of a system at different temperatures ( keeping the volume and moles of the gas constant) and creates a plot of P versus T. What is the slope of the line that results if the volume is 1.0L when 1.0 mol of ...

### Psycholofgy

Please help! I'm having a very hard time with this question. Can someone please tell me if this the correct answer. I choose A Jake finds guns attractive and desirable, while Arthur feels that guns are threatening and destructive. Their differing feelings toward guns represent...

### english (grammar) HELP!!!

Identify the sentcence that is not punctuated correctly. A. "Did she say 'no more tickets will be sold'?" Ben wondered. B. Lucy begged,"Just don't say, "Lets do lunch,"please!" C."Why did he call you 'bug' just then? Is that your nickname?" she asked. D. "Wait," she called. ...

### Physics PLEASE

I'm trying to solve this problem Calculate (a) how long it took King Kong to fall straight down form the top of the Empire State Building (380 m high), and (b) his velocity just before "landing". My teacher said try and rearagne this equation for t X = Xo + Vo t + 2^-1 a t^2 ...

### Physics Please check my answers

1. Complete reflection is the special case of refraction at an angle of 180. True. False. 2. A resonant frequency is the same as a natural frequency. True. False. 3. For a standing wave, the number of segments is an integer equal to the number of half-wavelengths. True. False...

### Math-Decimals

Please match each number with its best example. Some values will need to be changed into a decimal format. A. Recurring Decimal B. Mixed Number C. Non-repeating Decimal D. Finite Decimal E. Decimal Examples: ½ 5½ π 0.375 ⅓ I think 5½ is B and ⅓ is A, but I ...

### Health care please check my answer

Please check my answer thank you The lateral ports were removed. Where would these ports be located ? A. Toward the back B. Toward the head C. Farthest form the median D. Toward the front My answer is B

### repost physics E&M please

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures. V_v =88.4V This is the...