# physics please HELP !

128,227 results, page 9

### College Physics

Construct & solve a problem involving a person swimming across a river which has a waterfall some distance downstream. Please help, I have no idea where to start.

### physics multiple choice MCQ 3- i need help please @all respective sir & bro

q3= The unit of temperature in S.I units is? a. Centigrade b. Celsius c. Fahrenheit d. kelvin e. Rankin

### physics multiple choice MCQ 5- i need help please @all respective sir & bro

The unit of time in S.I. units is? a. second b. minute c. hour d. day e. year

### Plz help Physics-bobpursley

Bob, please confirm if I got this right and if not, please help to solve 1)A wire has a resistance of 10 ohm at 20 deg celsius and 13.1 ohm at 100 deg celsius. Obtain a value for its temperature coefficient of resistance. ans I got is this= using Rt = Ro (1 + alpha(T-To)) 13.1...

### PLEASE COULD SOMEONE HELP ME OUT Physics

Two long straight aluminum wires, each of diameter 0.30mm, carry the same current but in opposite directions. They are suspended by 0.50m long strings...If the suspension strings make an angle of 3.0 degree with the vertical, what is the current in the wires? Thank you......

### please, please help

can someone please help me on my earlier post?

### math please help me

18n-20 = 36-10n then what is n? please please help me

### Geometry proving quadrilaterals

Proving quadrilaterals PLEASE PLEASE PLEASE HELP *the diagonals of a square bisect the vertex angle * the diagonal of a rhombus are perpendicular *each diagonal of a rhombus bisects the opposite angles of the rhombus help me prove please how ? tell me

### Physics

question: img75.imageshack.us/my.php?image=dsc00702gn9.jpg The answer key said the answer is "C"...HOW!?!??!?!!? Please explain to me why it's 'C'

### Physics

Find the resultant of these two vectors: 2.00 * 10^2 units due east and 4.00 * 10^2 units 30.0degrees north of west. please SHOW me how to do this

### Physics

I need to find some information about the 'wave packet' thoery about light. Can you please tell me how I should do this.

### Physics

Please Help! In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this true?

### Physics

Please Help!!!: How many seconds will it take a 12hp motor to lift a 1500lb elevator at a distance of 9ft? what was the average velocity of the elevator?

### physics

for a science project about ten forms of energy,how do you convert or change one energy to another. can you give me an example please?

### physics

A shiny metallic Christmas ball ornament 5.10 cm in diameter is used as a mirror. What is the mirror's focal length? please answer in cm. thanks.

### Physics

I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,

### Physics

I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,

### Physics

I don't understand anything about the centripital force and torque please HELP me to understand hoe to solve problems relsted to this topics,

### Physics help ASAP please

An airplane is flying south at 500 km/hr and is being blown by a crosswind of 75 km/hr east. What is the resultant velocity of the airplane?

### Physics

Work of 730 J is done by stirring an insulated beaker containing 80 g of water. What is the change in the temperature of the water? Please show calculation

### Physics

An object moving to the right has a positive acceleration which is decreasing. Is this object speeding up or slowing down? Explain why? Please helppp

### help help helppppp pleasee

ý posted some question of physics... please any one answer me.... qyestions are bellow ý posted before 3 hours...

### Physics

What visible wavelengths will eject electrons from a a metal with a work function of 2.6 eV? Please show all work I am a little confused :)

### Physics

The acceleration of gravity at the surface of a newly discovered planet is 5.2 m/s^2. An astronaut throws a rock straight up at 10.5 m/s on this planet. How high will it go? Please help!!!

### Physics

How close would the masses 0.545 kg and 0.109 kg have to be in order for the gravitational force between them to have a magnitude of 1.03 N? Please Help!

### physics

In order for me to fill the table of equilibrium, how do I calculate change(mol) Please give me in detail about filling the table

### physics

The electric potential in a certain region is V = a x2 + b x + c, where a = 14 V/m2, b = −19 V/m, and c = 61 V. Determine the position where the electric field is zero. Answer in units of m Please help!

### physics

1. How many clories will be needed to change the temperature of 3kg of water from 30degree celsius to 100degree celsius? please show me how to compute this,

### Physics

A= 2i + 3j - k, B= 4i + 2j - 2k, Find a vector x parallel to A but has magnitude of B ? Answer is √12/7 (2i+3j) - K solve it , i have mcat admission test please solve it

### Physics

What is the mass of a copper wire that will give a wire, 0.20mm in diameter, a resistance of 400 ohms can you please show me the formulas

### physics

A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

### physics

A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

### PHYSICS

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is: A skier with a mass of 60.0 kg pushes...

### college physics

Interestingly, there have been several studies using cadavers to determine the moment of inertia of human body parts by letting them swing as a pendulum about a joint. In one study, the center of gravity of a 5.0 kg lower leg was found to be 18 cm from the knee. When pivoted ...

### Physics

Please help me solve this, most likely simple, problem. I am just starting to learn physics and am finding it very confusing. If you could include a key to explain any formulas used it would be very helpful thank you. I have calculated GPE to be 1500J but I am totally stuck, I...

### Please Help Anyone! :]

____ kg = 440 g ((Help Please)) ____ kg 1,006,000 ((Help Please)) 8.6 kg = ____ g ((8600/0.0086??)) 800 g = ____ mg ((800.000??)) 1.7 kg = ____ ((1700/0.0017??)) ____ mg = 6.2 kg ((Help please)) (((((I understand it it's just I can't get a correct answer again.Can someone help...

### PHYSICS PLEASE HELP !!!!!

A mass of 6 kg is tied to a 2 meter long rope and is swung in a vertical circle. At the bottom of the circle, the mass is moving at a speed of 16 m/s. What is the tension, in Newtons, in the rope after the mass has traveled to a point exactly halfway between the top and bottom...

### Physics *(URGENT)

Use a sentence to describe how the spacing of the dots for the accelerated motion is different from the spacing of the dots you would expect for uniform motion. In accelerated motion the dots are spaced further apart as the time increases. Would my answer be correct? If not ...

### history

what were the 5 factors that created an enviornment in Europe where dictators were able to take control of countries such as Germany and Italy? Please can you help me on this question. The subeject is history. I did put a subject. But i can not wait longer.please please help ...

### math(please help)

mr.wilson charges 215 dollars a month to board horses. if he boards a total of 25 horses,how much money will he earn? please show your work. my answer is 5,375 am i right if not please tell me why and how.

### math ergent please please...

Explain how to find the equation of the vertical asymptotes of a reciprocal function in full details. * Steve told me to look up in the web, and did, but still i couldn't find the correct one. someone help please....

### Physic please help!

In the photoelectric effect, suppose that the intensity of the light is increased, while the frequency is kept constant. The frequency is greater than the minimum frequency f0. State whether each of the following will increase, decrease, or remain constant, and explain your ...

### DrRuss/bobpursley/drwls please help!!!

Can you please clarify your response to my post Wednesday April 4th at 8:53pm and 8:54pm. Thanks for all of your help!!! pleasde repost it. Yes, repost it. Go to it, copy, and paste it here. Thanks. A vertical spring with a spring constant of 450 N/m is mounted on the floor. ...

### Physics PLEASE

Of course you have to rearrange it X -Xo = (V-Vo)(V+Vo)/2a (X-Xo)2a = (V-Vo)(V+Vo) 2 a (X-Xo) = V^2-Vo^2 ok to go from the first line to the second line you multiply by 2a I agree but what allows you to just put parenthsess around the X-Xo Thank You!

### physics

A bus traveling 85 km/hr is brought to a stop in 135 m. If the mass of the bus is 2250 kg, what was the retarding force provided by the brakes? Formula please

### To drwls

I posted some Physics questions yesterday, but no one got the chance to look at them, so can u please go to 2nd page and look through them.

### Physics

The Bob of a simple pendulm oscillates with an amplitude of 0.02m and a period of 0.5s, calculate the speed of the bob through the equilibrium position?. Please help

### Physics

A Spring of force constant 300N/m is compressed such that its length shortens by 3cm. calculate the energy stored in the spring?. please Help

### Physics-Could someone please help me?

Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object

### physics

How does a wavelength of the fourth harmonic on a rope with both ends fixed compare with that of the second harmonic? Please show all work Thank you

### Physics

In the radioactive formula 235 U → 235 Np + X, what does X represent 92 93 A. An Alpha Particle B. A positron C. An electron D. A gamma ray Please help ASAP!!! Thank you :D

### PHYSICS

A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP

### PHYSICS

A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP

### Physics

A net force of 150 lbs acts on a body whose weight is 96 lbs. What is its acceleration? Please indicate the formula used.

### Physics. PLEASE HELP!!

A Ferris wheel rotates 4 times each minute and has a diameter of 17 m. The acceleration of gravity is 9.8 m/s2. What is the centripetal acceleration of a rider? Answer in units of m/s2

### Physics. PLEASE HELP!!

A Ferris wheel rotates 4 times each minute and has a diameter of 17 m. The acceleration of gravity is 9.8 m/s2. What is the centripetal acceleration of a rider? Answer in units of m/s2

### Physics

I don't get this problem! Please show work. Thanks!! The de Broglie wavelength of a proton in a particle accelerator is 3.60 x 10^-14 m. Determine the kinetic energy (in joules) of the proton.

### physics help!

I don't get this problem! Please show work. Thanks!! The de Broglie wavelength of a proton in a particle accelerator is 3.60 x 10^-14 m. Determine the kinetic energy (in joules) of the proton.

### Physics

The total charge in an electrical circuit as a function of time is given by q=t/t^2+1 coulombs. Find the maximum charge q. Please provide your reasoning.

### Physics(Please check thanks)

Two vectors have magnitudes 4m and 3m. Which choice is not a possible magnitude for their resultant? 3m, 1m, 7m, 12m I chose 12m. Is this correct?

### Physics

A 11-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 5.3 µF, 10.7 µF, and 31.8 µF. Find the voltage across the 31.8-µF capacitor. Please Help!

### Physics 130

you push a 15kg cart with a force of 20N, 30 degrees below the horizontal. what is the normal force? Please help test tomorrow.

### Physics

PLEASE HELP. a 1000 kg car is coasting down the highway at 20 m/s. How much work do friction and air resistance do in bringing the car to rest?

### Physics help please

Rutherford Scattering Calculate the impact parameter for scattering a 7.7 MeV alpha particle from gold at an angle of (a) 1 degree and (b) 90 degrees?

### please help! physics

A block of mass m is pushed along a horizontal table by a force F= 70 N at an angle 55 degrees with the horizontal. The coefficient of kinetic friction is 0.3

### Physics

An automobile travels a distance of 12 km in 4 minutes. It then moves the next 12 km in 2 minutes. Please help me to calculate its acceleration which is constant throughout the motion. Thanks in advance ))))

### physics(Please respond)

if a rock is dropped into a well and it takes 17 seconds to hit the water how far down is the water level from the top of the well

### Physics

Estimate the increase in rest energy of a copper sample [100 kg, c = 387 J/(kg · °C)] if its temperature is increased 100°C. -answer needs to be in kg please.

### Physics

I have an ice cube :3000 KG,the tempereture is about 50 (cel).would you please let me know how much does it take long for it to change into water ,Hourly Basis ? Regards

### Physics please help!

Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed?

### physics HELP!!!

If the coefficient of kinetic friction is .25, how much horizontal force is needed to pull each of the following masses along a rough desk at a constant speed? a. 25 kg b. 15 kg c. 250 g explain please!!

### Physics

A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity ahs a magnitude of 9.81 m/s^2. To what height does it rise? please walk me through this problem:)

### physics

A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s^2. To what height does it rise? i got 4.7 can you please show me how to solve for this last one

### Physics

With an average acceleration of negative 1.2m/s squared, how long will it take a cyclist to bring a bicylcle with an initial speed of 6.5 m/s to a complete stop? answers are: either 2.0, 5.4. 0.18 or -1.8s Please help-I am totally confused

### physics

Please show work to how you find this answer. A baseball is thrown with an initial velocity of 30 m/s at an angle of 45 degrees. Neglecting air resistance, how far away will the ball land?

### Physics

You're on planet YZ and an astronaut observes that a 1.0 m long pendulum has a period of 1.50s. What is the free-fall accerlerttion on YZ? Answers: 1.003 m/s^2 26.4 m/s^2 17.6 m/s^2 0.23 m/s^2 Could someone direct me how to set this up or give me any assistance, please?

### physics

What is the change in the gravitational potential energy of a Boeing 767 jet as it soars from the runway up to a cruising altitude of 10.2 km? Assume its mass is a constant 2.04×105 kg. answer please in joules. thanks

### physics help please

A long jumper leaves the ground at an angle of 25.2 to the horizontal and at a speed of 11.2 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m What maximum height does he reach?

### Physics-PLEASE HELP ASAP

A tungsten target is struck by electrons that have been accelerated from rest through a 38.9-kV potential difference. Find the shortest wavelength of the radiation emitted.

### Physics(Please help)

What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0800 m, length = 3.60 m) that can be used to build a raft that will carry four people, each of whom has a mass of 60.0 kg? I do not know how to start this.

### 7th Grade Physics

Given a homogenous liquid mixture of sodium chloride (salt) and water, what would be the best method to separate these substances? What is the process. Please explain.

### Physics- Difficult Please Help

If a 60N weight free falls onto a hollow ball what amounts of force are produced after 3 seconds of impact, if it lands .3m away of the center?

### Physics

Why would normal force be set to zero to calculate the minimum possible speed a rider can have at the top of a loop. Please i need help, this is due in few hours

### physics, science

What effect does friction have upon a) ball bounce angle, and b) ‘speed’ of the court? Refer to clay and grass courts to help illustrate your answer. (4 marks) please help!

### Physics

Suppose the surface (radius = r) of a cylindrical space station is rotating at 29.1 m/s to provide artificial gravity. What must be the value of r for the astronauts to weigh 1/3 of their earth weight? Don't know how to start please help.

### Physics

If it takes 5 seconds for the baseball to fall, how far from the tower will it land? I used vertical distance formula dy=1/2(g)t^2 and got 122.5 but its one of the answers in the multiple choice. Please help.

### physics PLEASE HELP

A little bumblebee accelerates uniformly at 1.5 m/s2 from rest to 22 m/s. Immediately upon reaching 22m/s, the brakes are applied and it stops 2.5 s later. Find the total distance traveled.

### physics, please help

its the second part of the question that I don't understand: according the graph shown, the net force acting on an object varies wth the object's displacement. Calculate the work down by the force on the object at the various displacements listed below (i won't bother telling ...

### Physics

Fig.19 shows a crane lifting a car of mass 850 kg at constant velocity through a height of 12m in a time of 40s. The crane has a working efficiency of 60%. i) Calculate the tension in the lifting cable (in N) ii) Calculate the total input power required by the crane to lift ...

### Math SOMEONE PLEASE PLEASE PLEASE HELP

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41. (Do not use mixed numbers in your answers.)

### Science PLEASE, PLEASE, PLEASE ANSWER DUE TOMORROW

My body is covered with bony plates, but i am a fish. I am male, but i take care of all my young. i can swim, but i prefer to be carried by ocean currents. i look like a familiar land animal. What am i?

### chemistry!

i lost my notes for Stoichiometry and have a final tomorrow. ASAP would be appreciated. im trying to find a site that can help me with balancing word equations calculations:mol,g,liters-gas and determining limiting reagent and % yields. please please please help me.

### PLease Help Me IN Math

Problem: 25-x^2 6 ------ * --- 12 5-x What I Got: 5-x --- 2 *Please Check My Work And Tell Me If I am Correct or wrong.If I am wrong please help me as much as possible.Thank you~ Wrong. When are you going to factor the 25-x^2 ? The 5-x then will divide out. oh...so then will ...

### Physics please help

An object that is 31 cm in front of a convex mirror has an image located 16 cm behind the mirror. How far behind the mirror is the image located when the object is 24 cm in front of the mirror? do I use the formula 1/f = 1/di + 1/do?? please help

### physics

A 2 kg rock is released from rest at a height of 29 m. Ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights;20m 15m 9m * physics - bobpursley, Wednesday, November 17, 2010 at 9:32am...

### English

I NEED HELP PLEASE!!! I need a 5 paragrph mini theme on " Pizza Is The Perfect Meal". For each paragrphs I need 2 references. PLEASE, PLEASE, HELP SOON.

### Physics - same ? as marina but im smarter, lol

Marina is my bf and we both attend a educational program called proyecto science. In it, when we were to attend the physics course, we had this ?: T = 2ð² L/G in this equation, T represents time, L represents Length and G represents Gravity. We are supposed to use ...

### PHYSICS. HELP!

I've been stuck on this physics homework since I got home. I think the main issue I don't get is finding the components, and adding them to find the resultant force or velocity. Here's one problem. Three forces act on a point concurrently. Force a is 80N at 220 degrees, force ...

### Physics/Boyles Law

Please confirm/tidy up my fragile understanding as follows: Boyles Law is apparently now known by another name???? If I compressed the air in a room into a cylinder obviously everything that was in the room is now in the cylinder including the heat. As the heat out of a large ...