Wednesday
April 16, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

Post a New Question | Current Questions

PHYSICS HELP
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis
Tuesday, April 8, 2014 at 3:47pm

physics
A 4.0-m-long steel wire has a cross-sectional area of 0.050cm2. Its proportional limit has a value of 0.0016 times its Young's modulus. Its breaking stress has a value of 0.0065 times its Young's modulus. The wire is fastened at its upper end and hangs vertically. A. ...
Tuesday, April 8, 2014 at 3:15pm

physics
4
Tuesday, April 8, 2014 at 2:48pm

physics
4
Tuesday, April 8, 2014 at 2:45pm

Physics
i dont know
Tuesday, April 8, 2014 at 2:21pm

Physics
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...
Tuesday, April 8, 2014 at 1:58pm

Physics
An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no ...
Tuesday, April 8, 2014 at 1:57pm

physics
A golfer can generate a peak angular velocity of 3.89 rev/s. If the distance from the club head to it's axis of rotation is 0.96 meters, calculate the peak linear velocity with which he can hit the ball in meters per second.
Tuesday, April 8, 2014 at 1:56pm

Physics
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...
Tuesday, April 8, 2014 at 1:54pm

Physics multiple choice questions
Ah, first you try and it is too late because I have to go to sailing practice. Maybe Steve will help.
Tuesday, April 8, 2014 at 1:34pm

Physics multiple choice questions
1. Which of the following energy transformations best describes the operation of a solar powered battery charger? (a) electrical energy --> thermal energy --> kinetic energy (b) nuclear energy --> potential energy --> chemical energy (c) thermal energy --> ...
Tuesday, April 8, 2014 at 1:22pm

Physics
east is + 1500 * 25 - 2000 * 0 = 3500 v
Tuesday, April 8, 2014 at 1:08pm

Physics
change in momentum of car A = 1250 (40) = 50,000 toward the west so change in momentum of car B is 50,000 toward the east 50,000 = 2000 (east velocity - -25) 25 = east velocity + 25 east velocity = 0 stopped it dead in the water :)
Tuesday, April 8, 2014 at 1:07pm

physics
change in temp = 90 - 15 = 75 deg C heat in = mass * specific heat * change in temp = 12 kg * specific heat * 75 deg C I do not know specific heat in Joules or calories or kilocalories or whatever you are using in your class / kilogram deg C
Tuesday, April 8, 2014 at 1:00pm

Physics
2. Boxcar A, with mass of 1500 kg, is travelling at 25 m/s to the east. Boxcar B has a mass of 2000 kg, and is initially at rest. The box cars collide inelastically and move together after they get stuck. What is their combined velocity?
Tuesday, April 8, 2014 at 12:41pm

Physics
1. Car A, with mass of 1250 kg, is travelling at 30 m/s to the east. Car B is a truck with mass of 2000 kg, travelling to the west at 25 m/s. Assume these two vehicles experience an inelastic collision but do not stick together, and Car A goes off 10 m/s to the west. What will...
Tuesday, April 8, 2014 at 12:40pm

physics
the man changed his velocity by 6.59 m/s in 3.92 ms, so his deceleration was a = 6.59m/s / 0.00659s = 1000m/s^2 and, since F = ma, the force should now be obvious.
Tuesday, April 8, 2014 at 12:31pm

physics
A technician needs to determine the amount of energy required to increase the temp. of a vat containing 12 kg of water. The water enters the vat from the water mains at a temp. of 15 deg C. The technician knows that the final temp. required is 90 deg C. How much energy is ...
Tuesday, April 8, 2014 at 12:11pm

physics
I considered it. Thanks. Do you have a question?
Tuesday, April 8, 2014 at 9:56am

physics
Hmmm. And where exacly is the rope placed?
Tuesday, April 8, 2014 at 9:51am

physics
How to calculate the maximum vertical component of the force in rope BC when the force in rope is 400N
Tuesday, April 8, 2014 at 5:24am

college physics
191.1
Tuesday, April 8, 2014 at 5:04am

physics
610 J
Tuesday, April 8, 2014 at 1:02am

Physics
a;lsdkfj
Monday, April 7, 2014 at 11:44pm

physics
Freq. = 5*10^6rad/s * 1rev/6.28rad = 7.958*10^5 rev/s = 7.958*10^5 Hz. Xl = WL = (6.28*7.958*10^5)*100*10^-6 = 500 Ohms. Xc=1/WC = 1/(6.28*7.958*10^5)*100*10^-12 = 2000 Ohms. Z = R + j(Xl-Xc) = 30 + j(500-2000) = 30 - j1500 = 1500.3Ohms [-88.9o] I = V/Z = 1.0[0o]/1500.3[-88.9...
Monday, April 7, 2014 at 11:43pm

PHYSICS
sdfsafd
Monday, April 7, 2014 at 11:40pm

physics
Consider the rotational motion of two compact discs (CD). Disc A undergoes a rotation of 540 degrees in 1.50 secs, and disc B undergoes a rotation of π radians in 3.00 secs.
Monday, April 7, 2014 at 11:30pm

physics
at the bottom
Monday, April 7, 2014 at 10:41pm

Physics
My willy bird is 6 inches and has a mass, M, of 2.1kg. During penetration, it reaches a force or 15.0 N with a coefficient of friction 0.75. Calculate its rotational velocity given no respect to time. How much work is done in a thirty second period?
Monday, April 7, 2014 at 9:46pm

physics
af = mc#2
Monday, April 7, 2014 at 9:39pm

physics
af
Monday, April 7, 2014 at 9:38pm

Physics
What is the critical angle (in degrees) for a ray of light coming from a medium with an index of refraction of 1.4 to a medium with an index of refraction of 1.2? label the unit.
Monday, April 7, 2014 at 9:07pm

Physics
A fish swimming in a pond looks up at a dragonfly flying 45 cm above the surface of the water. How far does the dragonfly appear to the fish if the indices of refraction of water and air are 1.33 and 1, respectively? Enter your answer in cm.
Monday, April 7, 2014 at 9:06pm

Physics
Or approximate in your head 1 atm = 10^5 Pascals approx so 2.38 atm = about 2.3 *10^5 pascals which is 2.3 * 10^2 kilopascals or 230
Monday, April 7, 2014 at 8:41pm

Physics
use Google type 2.38 atm = Pascal get 2.38 atm = 241 153.5 pascals which is 241 Kilopascals
Monday, April 7, 2014 at 8:38pm

Physics
The air pressure in a tire is 2.38 atm. What is this pressure in kilopascals?
Monday, April 7, 2014 at 8:35pm

physics
1) 90 - 42 2) 27 * 2
Monday, April 7, 2014 at 8:31pm

physics
1. A light ray strikes a mirror at an angle of 42° from the surface of the mirror. What angle does the reflected ray make with the normal Ans. 42° 2. A ray of light hits a mirror at 27° from the normal. What is the angle between the reflected ray and the normal. ...
Monday, April 7, 2014 at 8:03pm

physics
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 2.2cm from the solenoid's axis (so at a point inside the ...
Monday, April 7, 2014 at 7:29pm

Physics
a) Vx = 65 cos 30, Vy = 65 sin 30 b) Vx =125 cos 40, Vy = -125 sin 40 c) Vx = 5.3 sin 30 , Vy = 5.3 cos 30 of course sin 30 = 1/2 and cos 30 = sqrt3/2
Monday, April 7, 2014 at 7:23pm

Physics
Draw each of the following vectors on graph paper, then find the x- and y- components. Make sure to include units in your answers for the components. a) ⃑r = (65 m, 30degrees above the positive x-axis) b) ⃑v = (125 m/s, 40degrees below the negative x-axis) c) &#...
Monday, April 7, 2014 at 6:44pm

physics
100turns of insulated wire are wraped around a wooden cylindrical core of cross-sectional area 12cm2. The two ends of the wire are connected to a resistor. The total circuit resistance is 13Ω. If an externally applied uniform magnetic field along the core changes from 1....
Monday, April 7, 2014 at 6:27pm

physics HELP
is the radius of the cable or of the axis to the point p?
Monday, April 7, 2014 at 6:13pm

College Physics
F1 = 8.2N[125o] F2 = 6.40N[233.4o] A. Fx = 8.2*cos125 + 6.40*cos233.4 = -8.519 N. B. Fy = 8.2*sin125 + 6.40*sin233.4 = 1.579 N. C. F^2 = -8.519^2 + 1.579^2 = 75.07 F = 8.66 N. D. Tan Ar=Fy/Fx = 1.579/-8.519=-0.18535 Ar = -10.5o = Reference angle. A = -10.5 + 180 = 169.5o = 10....
Monday, April 7, 2014 at 5:59pm

physics
dp=v*t=7800*t ds=4400(t+2.1) but dp=ds set the equations equal, solve for t. then put it in either equation, and solve for the distance.
Monday, April 7, 2014 at 5:56pm

physics
I agree with the hint! What is the question here? Here is an MIT solution.. http://ocw.mit.edu/courses/physics/8-02-​electricity-and-magnetism-spring-2002/as​signments/pss5.pdf see prob 5.3
Monday, April 7, 2014 at 5:48pm

physics HELP
http://www.jiskha.com/display.cgi?id=122​3804401 which is the same as i gave you ..
Monday, April 7, 2014 at 5:41pm

physics HELP
What was wrong with the answer I gave you earlier?
Monday, April 7, 2014 at 5:38pm

physics
1 electron= 1.6E-19C 1C= 1/1.6E-19 = 6.25 E18 electrons so then 16 times that is ....
Monday, April 7, 2014 at 5:37pm

physics
Wondering where P1 is?
Monday, April 7, 2014 at 5:34pm

physics
If for the pipe carrying water in a building, h = 220 meters, v_1 = 3.8 m/s, and the cross-sectional area at 1 is twice that at 2. What must P_1 be in order that P_2 = 135000 Pa? P_1 =
Monday, April 7, 2014 at 5:03pm

physics
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis (so at a point outside the ...
Monday, April 7, 2014 at 5:02pm

physics
How many excess electrons are there in a typical lightning bolt that has about 16 C of charge? Answer 1 x 1020 1 x 1019 10 1 x 1016
Monday, April 7, 2014 at 5:01pm

physics
An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip as shown? This one requires some integration! I suggest ...
Monday, April 7, 2014 at 5:01pm

physics HELP
Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter radius is 3mm...
Monday, April 7, 2014 at 5:01pm

physics
The figure shows a nozzle on a hose carrying water. If the pressure at Point 1 is 290 x 10^3 Pa, the velocity 0.64 m/s, and the diameter 20 cm. Given that the diameter at point 2 is 1.4 cm, what is the velocity at point 2? v_2 = What is the pressure at point 2? P_2 =
Monday, April 7, 2014 at 4:57pm

physics
Water is in the big beaker in the figure on the left. Scale 1 reads 87 Newtons, scale 2 reads 544 newtons, and scale 3 reads 0 newtons. The hanging block has a density of 15 x 10^3 kg/m^3. What does scale 1 read after the block is fully lowered into the beaker of water? Scale...
Monday, April 7, 2014 at 4:55pm

physics
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...
Monday, April 7, 2014 at 4:36pm

physics HELP
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis (so at a point outside the ...
Monday, April 7, 2014 at 3:58pm

physics
jhklghil
Monday, April 7, 2014 at 3:33pm

Physics multiple choice questions
1. Which of the following energy transformations best describes the operation of a solar powered battery charger? (a) electrical energy --> thermal energy --> kinetic energy (b) nuclear energy --> potential energy --> chemical energy (c) thermal energy --> ...
Monday, April 7, 2014 at 12:39pm

physics
a 4kg bird is flying with a velocity of 4m/s2. what is the kinetic energy?
Monday, April 7, 2014 at 11:54am

physics
not sure how to get i
Monday, April 7, 2014 at 11:19am

physics
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis (so at a point outside the ...
Monday, April 7, 2014 at 10:43am

physics
Pick some time over which the dB/dt takes place, say t = one second. Then dB/dt = 3.2/1 = 3.2 T/s then you can get i for that dB/dt then i * t = i * one second
Monday, April 7, 2014 at 10:19am

Physics
I am not going to look at this until I see some attempt by you to balance forces and moments.
Monday, April 7, 2014 at 10:16am

Physics
You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525 m from its ...
Monday, April 7, 2014 at 9:52am

physics
100turns of insulated wire are wraped around a wooden cylindrical core of cross-sectional area 12cm2. The two ends of the wire are connected to a resistor. The total circuit resistance is 13Ω. If an externally applied uniform magnetic field along the core changes from 1....
Monday, April 7, 2014 at 9:27am

physics
If you had a 1 m^2 pipe, what height would give a weight on the bottom of 3E5N? weight water= mass*g= density*1m^2*height*9.8Nt/kg = 1041 *9.8*height N height= 3E5/(1041*9.8)= 29.4m Now, to check: you know atomospheric pressure is about 10 m water height, so 300kpa/100kpa= 3 ...
Monday, April 7, 2014 at 8:51am

physics plz help
Again, I dont know what you are doing? Is this a numerical integration issue, with setup on a specific calculator?
Monday, April 7, 2014 at 8:47am

physics
Trivial problem, come on. The E effective for ammpers' law is 1am out-2amps in= -1 amp (inward) Use ampere's law. For a more difficult version, see this: http://physics.bu.edu/~duffy/semester2/d​14_ampere_cylinder.html
Monday, April 7, 2014 at 8:44am

physics
Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter radius is 3mm...
Monday, April 7, 2014 at 7:30am

physics plz help
i tried but I am getting incorrect answer
Monday, April 7, 2014 at 7:30am

physics plz help
there were options.
Monday, April 7, 2014 at 7:29am

physics plz help
equation that i can integrate
Monday, April 7, 2014 at 7:28am

physics
pressure*area=weight area=80*9.8/pressure in m^2
Monday, April 7, 2014 at 7:23am

Physics -- check answers please
you got number 4 correct. Others wrong
Monday, April 7, 2014 at 7:22am

physics plz help
I dont understand what you need? a. the integral itself? b. the algorithm for numerical integration? c. a website?
Monday, April 7, 2014 at 6:52am

physics
So what is your question? This is an integration problem. Draw the figure, and do the integration. Use symettry.
Monday, April 7, 2014 at 6:50am

physics plz help
I need help in calculating work. following quantites are given. * G: 6.67E-11 *Mass of earth:5.98E24 *mass of satelightt:80kg *x(initial) center of the earth-7E6 m *x(final) center of the earth 12E6 m How do I make integral equation I need use 20 interval or calculate in excel...
Monday, April 7, 2014 at 5:36am

physics
An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip as shown? This one requires some integration! I suggest ...
Monday, April 7, 2014 at 5:36am

physics/calculus
I need help in calculating work. following quantites are given. * G: 6.67E-11 *Mass of earth:5.98E24 *mass of satelightt:80kg *x(initial) center of the earth-7E6 m *x(final) center of the earth 12E6 m How do I make integral equation I need use 20 interval.
Monday, April 7, 2014 at 1:04am

Physics -- check answers please
1. Which of the following energy transformations best describes the operation of a solar powered battery charger? (a) electrical energy --> thermal energy --> kinetic energy (b) nuclear energy --> potential energy --> chemical energy (c) thermal energy --> ...
Monday, April 7, 2014 at 12:15am

physics
5x10^6 rad/s = 795774 Hz Z = √(R^2 + (Xl-Xc)^2 Xc = 1/ωC = 1/(5*10^6 * 100*10^-12) = 1/(500*10^-6) = 2000 Xl = ωL = 5*10^6 * 100*10^-6 = 500 So, now you know R and Z. Go for it, and recall that I = E/Z
Monday, April 7, 2014 at 12:09am

physics
Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of 80.0 kg, and the gauge pressure in the tires is 3.50×105 Pa
Sunday, April 6, 2014 at 11:50pm

Physics
let h = mass of hot dogs p = mass of potato salad l = mass of lemonade solve for x, position of lemonade 52/2 = (p*0 + l*x + h*52)/(p + l + h) 52/2 - x = distance from center and it will be towards the hot dogs
Sunday, April 6, 2014 at 11:37pm

Discrete Math
There are 150 students taking Discrete Mathematics II, Calculus II, and Physics I courses. Of these 51 are taking Discrete Mathematics II, 111 are taking Calculus II, and 63 are taking Physics I. There are 41 taking Discrete Mathematics II and Calculus II, 32 students taking ...
Sunday, April 6, 2014 at 11:29pm

Physics
!@#$%^&
Sunday, April 6, 2014 at 11:04pm

Physics
pls let the answer be at the end of this - sad college student
Sunday, April 6, 2014 at 11:03pm

Physics
he
Sunday, April 6, 2014 at 10:53pm

Physics/Biohemistry
If 1/C1+1/C2+1/C3=1/Ceq and Ceq=3.18 mF, then replace the given variables as such: 1/6.54+1/8.19+1/C:unknown=1/3.18 Now it becomes an algebra problem: Multiply both sides of the eqn by 3.18, then you'll have: 3.18/6.54 +3.18/8.18+3.18/Cunknown=1 Simplify: .49+.39+3.18/C=1 ...
Sunday, April 6, 2014 at 10:51pm

physics
Water towers store water above the level of consumers for times of heavy use, eliminating the need for high-speed pumps. How high above a user must the water level be to create a gauge pressure of 3.00×105 N/m2 ?
Sunday, April 6, 2014 at 10:47pm

physics
A cosmic-ray proton in interstellar space has an energy of 19.5 MeV and executes a circular orbit having a radius equal to that of Mars' orbit around the Sun (2.28 1011 m). What is the magnetic field in that region of space?
Sunday, April 6, 2014 at 10:21pm

physics
You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525 m from its ...
Sunday, April 6, 2014 at 9:47pm

physics
Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter radius is 3mm...
Sunday, April 6, 2014 at 9:32pm

physics
1 C 2 less, maybe you run over the mark from the first one on the track just as the rear can explodes, and the two marks on the track are together :)
Sunday, April 6, 2014 at 8:57pm

Physics
On earth I assume weight on first line = (86.4+20.8)(9.81) weight on second (lower) line = 20.8 (9.81)
Sunday, April 6, 2014 at 8:53pm

physics
in the horizontal direction the ball has no acceleration once let go (no horizontal force) so now it is 9 m/s^2 down by the way, g on Mars about the same as earth ? FALSE
Sunday, April 6, 2014 at 8:50pm

physics
A train is traveling along a straight, horizontal track at a constant speed of 20 mph (i.e.,a non-relativistic speed). An observer on the train places paint cans at the front and back of one of the cars. She then detonates the cans. Due to a malfunction, the can at the front ...
Sunday, April 6, 2014 at 8:45pm

Physics
Consider two masses that hang from an overhead beam. The first mass of 86.4 kg is attached to the beam using an ideal rope. The second mass of 20.8 kg is attached to the first mass with an ideal rope and hangs directly under the first mass. (a) Find the tension in the lower ...
Sunday, April 6, 2014 at 8:44pm

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members