physics please HELP !

128,227 results, page 18

Physics(Please respond)

1) A penny is dropped from rest from the top of a very tall building. Assuming the height of the building is 407 m and ignoring air resistance, find the speed with which the penny strikes the ground. I am not sure how to start this. Thank you!

Physics(Please help)

A jet flying at 106 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 2.40 × 105 kg. Calculate the magnitude of the necessary lifting force. Would I use the equation Fc=mv^2 / r ??


On the moon, the downward acceleration dur to gravity is only about one-sixth as large as it is on earth. if a 16 kg rock is put on a spring scale on the moon. What would the scale read? Give your answer in newtons.


A solenoid is 3.2 m long and has 500 turns per meter. What is the cross-sectional area of this solenoid if it stores 0.32 J of energy when it carries a current of 12 A? So I used L = 2*E / I^2; and then I used A = L*l / (uo * N^2) but my answer isn't coming out right at all. ...


A 500kV power line has a maximum Voltage drop of 3% and is design to carry 1000 Amps. If the conductor has a 0.026 ohms/km resistance, what is the maximum distance the conductor can be run (to the nearest complete km)? Hint: P=IE, E=IR How do you solve this? Please help and ...

quantum physics

Can anyone help me to solve this problem? Suppose we have a particle in 1-dimension, with wavefunction Ae^(−|x|2d). What is the probability to find the particle in the interval [0,d]? Please provide your answer in terms of A, d, mathematical constants such as π (...

Quantum Physics

Suppose we have a particle in 1-dimension, with wavefunction Ae−|x|2d. What is the probability to find the particle in the interval [0,d]? Please provide your answer in terms of A, d, mathematical constants such as π (entered as pi) or e (entered as e). (Assume that...

Physics Please help!

If it requires 5.5J of work to stretch a particular spring by 2.3cm from its equilibrium length, how much more work will be required to stretch it an additional 4.5cm ? Express your answer using two significant figures. W=_____ J?


A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 180 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle? Okay so this is my work for this problem. please help If I did something wrong. Thanks! 40=1/2(9.8...


A woman on a bicycle traveling at 10m/s on a horizontal road stops pedaling as she starts up a hill inclined at an angle of 10° to the horizontal. How far up the hill does she travel before coming to rest? I really don't understand this question. Please help!


A train moving at a constant speed of 100km/h travels east for 40min, then 30o east of north for 20 min, and finally west for 30min. What is the train's average velocity for the trip? The answer is 30 km/h (E 40 N) but I keep getting 66.6 km/h (E 30 N) help please!


A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to the flatcar. What is ...

Physics please check

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...

Physics/ Chemistry please help

Hemoglobin has a molecular mass of 64 500 u. Find the mass (in kg) of one molecule of hemoglobin. Thanks for your help, but I figured this one out on my own.


Most housewives use spin dryers to dry their clothes. Explain how water is removed from the clothes in a spin dryer. PLEASE EXPLAIN! :)

Physics-please help

You're given a ramp 0.5m in height with a 3m incline. A mass of 1kg is at the top of the ramp and there is a friction of 2N. If the ramp has a force of friction of 2N, what will the speed at the bottom of the ramp be?

Physics(Please respond)

A 12-kg crate is pushed up an incline from point A to point B. What is the change in the gravitational potential energy of the crate? Point A is 2.0m and point b is 7.0m I am not sure how to start this.

Physics -- check answer please

Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees


A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6.0m^3. How much work is done by the gas if it expands at constant pressure to twice its initial volume? Please help ;_;


a penny is placed .1 m from the center of a turntable. if the coefficient of static friction between the penny and the turntable is .5, the maximum linear speed at which the penny can travel without slipping is approximately a) .49m/s b) .7 m/s c) 1.3 m/s d) 1.4 m/s e) .2 km/s...


Keplers third law I understand. T^2/a^3 of one planet = T^2/a^3 second planet. But I can't do the algebra to solve for the second planet's a^3 (semimajor axis) Would someone walk me through the steps please? Thanks.


. A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Please...

Physics URGENT

I did a lab on DC circuits, and we calculated the resistance of multiple resistors in parallel. Resistance of Resistor 1 & 2 = 1000 +/- 5% so R1 =1000+/- 50 R2= 1000 +/1 50 i need to calculate R using the equation... R= 1/R1 + 1/R2 I am confused as to what the uncertainty ...

Physics(Please help)

A fan blade is rotating with a constant angular acceleration of +12.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity? I do not know how to start this.

Physics(Please help)

A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial volume is 1.70 x 10-3 m3. What is the final volume of the gas? Would I multiply the two values?


Find the electric field on the axis of a uniformly charged solid cylinder, at a  distance z from the center of the cylinder. The length of the cylinder is H, its  radius is “a”, and the charge density is ρ. (Assume that z > H/2).


A 12000 kg truck strikes the back end of a 750 kg car moving at 15 m/s. If the truck loses 7500 kg-m/s of its momentum to the car, what is the car's velocity after the collision? I'm not sure how to solve this one... Help please?!


I am finding the value of the time constant in a circuit from the graph and by the CR equation. When using the graph I am getting t= 50s and when using the equation t=CR the answer is 2.09. Can someone help me please?


need help combining these vectors (if you can please show me a step by step guide of combining these two. Thank you 56m at 296 degrees, then 83m 152 degrees


Derive an expression for the vertical position of a projectile in terms of its horizontal position. This sometimes called parametric equation or path equation for the projectile. I don't know how to get it please help. Thank you.


If a car travels 60 mi. north for one-half hour, 100 mi. west for one hour, and 60 mi. south for 30 minutes, what is the total displacement of the car? PLEASE HELP ME!!!!


A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6.0m^3. How much work is done by the gas if it expands at constant pressure to twice its initial volume? Please help me I really don't know what to do,,,


1. A 38kg object is traveling down the ramp and experiences a frictional force of 180N. Calculate the angle of incline and the friction coefficient between the two surfaces. Answers: μ(mu)=0.55 Θ=28.9 degrees But please show work and all equations/variables used.


At a Grand Prix, drivers sustain lateral accelerations (sideways) about five times the acceleration due to gravity while driving around curves at speeds of 288 km/h. Assuming a circular curve, find the radius of that section of the track.


imageshack(.)(us)/photo/my-images/834/j6wv.jpg/ imageshack(.)(us)/photo/my-images/17/6n4x.jpg/ please PLEASE IM BEGGING YOU MY TEACHER WILL BE GIVING ME 79 IF I DIDN'T GET THIS .. OR ELSE LOWER THAN THAT. PLEASE


How many days does it take for a perfect blackbody cube (0.0100m on a side, 30.0 degree C)to radiate the same amount of energy that a one-hundred-watt light bulb uses in one hour? I got no idea to do it. Please give me some hints!!!Thanks!!!

11th Grade Physics

A rocket is fired vertically from the ground with a resultant vertical acceleration of 10ms^-2. The fuel is finished in 1 minute and it continues to move up. What is the maximum height reached? Solve it!!! N Please solve it as i've to copy it in my correction notebook it's my ...


Find the x- and y-coordinates of the center of mass of the flat triangular plate of height H = 87.8 cm and base B = 50.7 cm shown in the figure. x = y = I have tried this problem a multitude of times and I cannot seem to get this right, Please help! I have used the equation ...


Who is credited with inventing the fluorescent light bulb? Some resources told me it was Nikola Tesla, yet others told me it was a collaboration of Peter Cooper Hewitt, Edmund Germer, George Inman, and Richard Thayer. Can someone please clarify this for me? Thank you.


A crate of oranges slides down an inclined plane without friction. If it is released from rest and reaches a speed of 4.883 m/s after sliding a distance of 2.01 m, what is the angle of inclination of the plane with respect to the horizontal? Please note: Give your answer in ...

physics help!

When a gas follows path 123 on the PV diagram in a rectangle shape labeled 1234 cycle, 449 J of heat flows into the system and 179 J of work is done. What is the change in the internal energy of the system? * I keep coming up with 270 but this is incorrect. PLEASE HELP :)


A race car moving at 157km/hr decelerates at -7.00 m/s^2 to a speed of 75.0km/hr A) how long did this take? B) how many meters did the car travel during this deceleration? I attempted this problem many times and i don't seem to get the correct answer please show all work thank...


The figure shows an Atwood machine (a wheel suspended from the ceiling with two masses connected by a string) with m1 = 1.0 kg and m2 = 1.1 kg. If m2 descends a distance 3m from rest in 3.6 seconds, what is the strength of the gravitational field, g, at this location (N.B. it'...


# of words: 36 72 108 144 180 216 # of sec: 10 20 30 40 50 60 PLEASE HELP ME!!!!!!!

Repost PLease Help!

d+7/d^2+49= / (d+7) (d+7)*I got the bottom but I don't know what to put at the top...please help!!! answered below


Can someone please check on these for me please .Thanks Use the Quadratic Formula to solve 1.


Can someone please give me basic instructions on how to write a 10% summary please.

Calculus please help

f(x)=(x^2+2x+3)^4, find f'(x). what rule do we use and can some please show me the steps



AP U.S History

Can someone please explain what Federalism is? I don't quite get it yet. Please be specific.


Please state the DOMAIN of the following, and explain how you obtained that answer please. g(x)=5^x


What is the name of the large gulf on the northern coast of australia? please please help

Algebra (please help!)

Factor. 0.25x^2 + 0.3x + 0.09 I am having some trouble with this one. Please help if you can. Thank you! :-)

Algebra, PLEASE help!

Factor. 0.25x^2 + 0.3x + 0.09 I am having some trouble with this one. Please help if you can. Thank you! :-)


Please help with comparing and contrasting "osmoisis and diffusion" also please help with an example of each. Thank you!!!


how has technology played a role in the swine flu.............................PLEASE answer PLEASE AND THANK YOU


please please explain solve using the addition and multiplication principles 5 + 2x <21

Political Science-PLEASE HELP

What are the system's greatest strengths and weaknessess? Please help fast.


please list out 6 functions of the blood and please write the reference of it

algebra, help please

(3 x 8)-2 + (3+6)=17, I need a word problem to match the equation and am stumped, could you please help


Find the derivative of (sin(^3)x)(tan x) Please explain to me in steps please , thank you

Science 8- Please Help!

Is light transmitted through frosted glass? Explain Please!

math-algebra please help!

Please me find the points to graph for the follow equations. x+3y<9, 3x+y<9, x>0, Y>0


Please help How do I solve the quadratic equation 3x^2 + 5x + 2 =0 Please explain the steps-I really don't get this


What is a tertiary industry? Please give me a specific answer please! =3 Thank ye! -Pancake

marketing,,please help me

is anyone can help me please for this question. why are supplier an mportant uncontrollable factor for many companies?


PLEASE HELP THANK YOU. I need to evaluate this equation with the following inputs. F(x) = 5x -12 Input: 3 and 2


What is the subject of the following sentence? Please help me figure this out! a. Please b. help c. me d. You (implied)

algerba 1 math

how do i solve the equation: -2(-8-4)^2+-8-4/4 please show step by stap HELP PLEASE

math problem

Please solve using the addition principle please do check x + 3/13 = 5/13


i need help on arrays and an expanded algorithm please wright as asap please


how do you find the coordinates of the midpoint of a segment? (it gives you the endpoints) PLEASE HELP!!!! THANK YOU!!!!!

Math Help PLEASE!

Find the equation of the hyperbola whose vertices are at (-1,-5) and (-1,1) with a focus at (-1,-7). Please and thank you.

To JMartina

Please do not post your e-mail address here. Repost your question, please.

7th grade math

solve for k -4k-8k+7=-53 Please explain how you found your answer!! Please help!!


what is (14x-5)+(6x-4)simplified? Please help I would appreciate and PLEASE show the work!! Thank you!!

college algebra, Please help!!

find the f and g, so that fOg= H H(x)=sqrt x^2+17 please show work


what does the vc/v and v/cv pattern mean?????Tell me pretty please please with a cherry ontop


Write the decimal 0.079 as a percent. Please Answer Correct Please :(

math asap

I don't understand can you please help bedtime 1. (-5)-(-6)+(-1) 2. (-3.1)-(-7.5)+(+1.8) 3. (-9)+(-2)-(-6)+(-5) 4. (+5.2)+(-2.6)-(-3.7) 5. (-8)-(+7)-(+10) 6. (+4.5)-(-3.25)-(+1.5) Please answer all 6 if possible thanks!


Please for the classification of metals, their uses in the home and the care of each metal. Please help me!!!!!!

aLGEBRA 2 help please would appreciate

x+x/4=25/6 find x please show all the step thank you


could i please get help with my project please? also what does this mean: a linear function with a discrete domain?


solve using elimination please show how to come up with answer. 6x - 3y = 18 6x + 3y = -12 Please help!!!


Please can i have a list of adaptive features of terrestrial plants. Please


Multiply. (x+4)(x-2) = x^2+2x-8 Is the answer correct, if not can you please point out what I did wrong? Please and Thank you


What is been written wrong in the following sentence " i am please asking for airtime please "


Can someone please check my other answer from Saturday June 5 @ 10:29 please thank you ?!


How many arrays are there for modeling a rectangular quilt with 24 paper squares? please help


P +4- 2 (p-10)> 0 Please check, it was marked wrong P+4 -2p +20 > 0 -p+ 24> 0 -p >-24 P > 24 Answer choices are 29, 26, 24, 22 Please explain thank you


Post a New Question Current Questions Homework Help: Math (HELP PLEASE) Posted by Anonymous on Tuesday, September 17, 2013 at 8:37pm. Estimate the total precipitation in inches and in days for Asheville and Wichita. City: Inches: Days...


please,i need help on this question:a thin circular ring of radius 20cm is charged with a uniform charge density(rho),if a small section of 1cm length is removed from the ring.calculate the electric field intensity at the center of the ring


Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through your steps, don't ...


I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...


I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...

math-please help

x + 12 >or= to 1 What could x be? I think that it is -11 or less. I'm not sure though. Please help me! that is correct 11


Solve this : (8x^3 ) - (168x^2) + ( 864x) = 1120 please >>>>>>>>>> I need it >>> please

algebra- please HELP

What is the invers of: y=2log(x+1) and please explain this to me..not just an answer.


Please show me how to do this problem please. The ratio of 7 dimes to 3 quarters.

Please help with Chemistry due today

please help with the questions that I have submitted.


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