Monday
April 21, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

Post a New Question | Current Questions

physics
A uniform magnetic field makes an angle of 30 degrees with the axis of a circular loop of 300 turns and radius of 4 cm. The magnetic field changes at a rate of 85 T/s. Determine the magnitude of the induced emf in the loop.
Sunday, March 30, 2014 at 9:48pm

physics
dsdf
Sunday, March 30, 2014 at 9:42pm

Physics
What is the mass of the crate?
Sunday, March 30, 2014 at 8:18pm

Physics
ok. Should I post it again?
Sunday, March 30, 2014 at 8:17pm

Physics
You are welcome :) Good luck. Come back and tell me when you find out.
Sunday, March 30, 2014 at 8:15pm

Physics
I know the flow rate is the speed times the area. That is my field :)
Sunday, March 30, 2014 at 8:12pm

Physics
Thanks for helping!!
Sunday, March 30, 2014 at 8:11pm

Physics
I can not find an error. I hope one of the other math/physics teachers finds something.
Sunday, March 30, 2014 at 8:10pm

Physics 112
a) as t--> oo inductor is a short circuit, no reactance so V = i at big t * R V = (8.4)(.26) = 2.14 Volts b) at t = 0, i = 0, so all voltage across L 2.14 = L di/dt let i = 8.4 [ 1 - e^-t/tau ] given tau = .1 s i = 8.4 [ 1 - e^-10 t ] di/dt = 8.4 (10 e^-10 t) di/dt = 84 at ...
Sunday, March 30, 2014 at 8:08pm

Physics
The conversions are correct and I'm getting the same answer using your method, but it's still saying that they are incorrect. Sorry for bothering you so much...
Sunday, March 30, 2014 at 7:58pm

Physics 112
A battery is connected in series with a R = 0.26 Ω resistor and an inductor, as shown in the figure below. The switch is closed at t = 0. The time constant of the circuit is τ = 0.10 s, and the maximum current in the circuit is I = 8.4 A. Find the following. (a) the ...
Sunday, March 30, 2014 at 7:51pm

Physics
call 41.18 41.2 maybe, sometimes they fuss about their round off rules.
Sunday, March 30, 2014 at 7:50pm

Physics
Well, it is their word against mine I guess, but check my arithmetic and units carefully Physics - Damon, Sunday, March 30, 2014 at 7:21pm 25 L = 25 * 10^-3 m^3 2.77 cm = .0277 m 1.4 min = 84 seconds flow rate * time = amount pi r^2 v * 84 = .025 m^3 pi (.0139)^2 v = .025 v = ...
Sunday, March 30, 2014 at 7:48pm

Physics
I'm not trying to be mean or anything. The WebAssign website said the answers was wrong.
Sunday, March 30, 2014 at 7:46pm

Physics
Well, figure out what I did wrong. (I think nothing)
Sunday, March 30, 2014 at 7:39pm

Physics
Water flowing through a garden hose of diameter 2.77 cm fills a 25.0-L bucket in 1.40 min. (a) What is the speed of the water leaving the end of the hose? Answer in m/s (b) A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the...
Sunday, March 30, 2014 at 7:29pm

Physics
25 L = 25 * 10^-3 m^3 2.77 cm = .0277 m 1.4 min = 84 seconds flow rate * time = amount pi r^2 v * 84 = .025 m^3 pi (.0139)^2 v = .025 v = 41.18 m/s if 1/3 diameter then 1/9 of area so speed is nine times original 371 m/s
Sunday, March 30, 2014 at 7:21pm

Physics
Water flowing through a garden hose of diameter 2.77 cm fills a 25.0-L bucket in 1.40 min. (a) What is the speed of the water leaving the end of the hose? Answer in m/s (b) A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the...
Sunday, March 30, 2014 at 7:13pm

Physics
vertical ? I thought table was level. I will assume you mean from the y axis. final momentum y component = m (5) cos 28 + m (4) cos 32 = 7.81 m final momentum x component (I will assume one + and the other -) = m (5) sin 28 - m(4) sin 32 = 2.18 m Now I will have to assume ...
Sunday, March 30, 2014 at 6:36pm

Physics
inelastic, energy was radiated in sound waves
Sunday, March 30, 2014 at 6:15pm

Physics
If Vector A + Vector B = Vector C then orthogonal components of the vectors also add. If V = A + B then Vx = Ax + Bx and Vy = Ay + By and Vz = Az + Bz and as many more dimensions as our tensor occupies ") (b) NO !!!!! It is only conserved in an elastic collision Energy is...
Sunday, March 30, 2014 at 6:14pm

Physics
Two identical pucks are set on a collision course on an air table. After the collision, puck A has a final velocity of 5.00cm/s at an angle of 28 degrees from the vertical and puck B has a final velocity of 4.00cm/s at an angle of 32 degrees from the vertical. Determine the ...
Sunday, March 30, 2014 at 6:06pm

Physics
Two pucks with similar masses collide with each other over a nearly frictionless surface. At the moment of collision, a sharp knocking sound is produced. Is this collision elastic or inelastic? Explain.
Sunday, March 30, 2014 at 6:05pm

Physics
Consider an isolated system consisting of two masses, each of which has a velocity vector in two dimensions. When these two masses collide the total momentum of the system is conserved. (a) Show that if the total momentum of the system is conserved then the component momenta ...
Sunday, March 30, 2014 at 6:04pm

physics
BUT they want miles/ hr so 29.4 m/s * 1 mile/1609 m * 3600 s/h = 65.8 miles/hour
Sunday, March 30, 2014 at 5:27pm

physics
the ground is 3 seconds down d = (1/2) (9.81) (3)^2 correct d = 44.1 METERS (THAT IS PART B) (that is 9.81 m/s^2 * 9 s^2 so just m or meters) NOW THE SPEED (Part A) v = g t v = 9.81 m/s^2 * 3 s = 29.4 m/s (THAT IS PART A)
Sunday, March 30, 2014 at 5:25pm

physics
You are terrribly fouled up with units. Give me a minute
Sunday, March 30, 2014 at 5:21pm

physics
is it d = 1/2 (9.8) (3)^2 = 44.1 m/s^2/3s =14.7 m/s x 2 = 32.87 = 32.87 mi/h? and b) d= 1/2 (9.8) (3)^2 =44.1 m/s^2/35 = 14.7 m/s
Sunday, March 30, 2014 at 5:17pm

physics
WORK IN METRIC convert later if dealing with carpenters.
Sunday, March 30, 2014 at 5:16pm

physics
5/20=4 km/min = 4,000 m/min = 66.67 m/s? BECAUSE 5/20 = 1/4 not 4
Sunday, March 30, 2014 at 5:16pm

physics
come on now, use what we have done v = g t but to go from m/s to mi/hr use 3600 seconds / hour and 1609 meters/mile a floor is about 3 meters
Sunday, March 30, 2014 at 5:13pm

physics
What speed does the ball in the first question have in falling 3.5 s? ------------------- I told you in the first line, 34.3 m/s ------------------- in 4 sec d = .5 * 9.81 *16 = 78.5 meters so no
Sunday, March 30, 2014 at 5:09pm

physics
a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how far, in meters, does ...
Sunday, March 30, 2014 at 5:09pm

physics
why is it not 30-0/20=1.5 and 5/20=4 km/min = 4,000 m/min = 66.67 m/s?
Sunday, March 30, 2014 at 5:03pm

physics
does this change the answer... the ball is dropped from the top of an 80-m-high building. does the ball reach the ground in 4.0 s? I got no, it falls only 78 m in 4.0 s What speed does the ball in the first question have in falling 3.5 s?
Sunday, March 30, 2014 at 4:59pm

physics
idk
Sunday, March 30, 2014 at 4:46pm

physics
v = g t = 9.81 * 3.5 = 34.3 m/s but what if it hit the ground? d = (1/2) g t^2 = 60 meters so it has not hit ground yet, whew
Sunday, March 30, 2014 at 4:37pm

Physics.
POST ANSWER! :3 TROLLING ON EVERY WEBSITE IN THE WORLD
Sunday, March 30, 2014 at 4:37pm

Physics
area = A = pi D^2/4 = pi (.0277^2)/4 = 6.03*10^-4 m^2 Q = volume/second 25 * 10^-3 m^3 / 84 s = .298 *10^-3 m^3/s A v = Q v = Q/A = .298*10^-3/6.03*10^-4 = .0494 *10^1 = .494 m/s
Sunday, March 30, 2014 at 4:35pm

physics
a = change in velocity/change in time = 44/5 = 8.8 ft/s^2 a = same formula = (88-44)/4 = 11 ft/s^2 a = (66 -88)/3 = -7.33 ft/s^2 sum of a*t / total t (8.8*5 + 11*4 - 7.33*3)/12 = 5.5 m/s^2
Sunday, March 30, 2014 at 4:29pm

physics
cffg
Sunday, March 30, 2014 at 4:28pm

physics
a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
Sunday, March 30, 2014 at 4:18pm

Physics
sdf
Sunday, March 30, 2014 at 4:11pm

Physics
Water flowing through a garden hose of diameter 2.77 cm fills a 25.0-L bucket in 1.40 min. (a) What is the speed of the water leaving the end of the hose? Answer in m/s (b) A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the...
Sunday, March 30, 2014 at 3:41pm

physics
5000 meters in 20*60 = 1200 seconds Vi = 30,000 m / 3600 s = 83.3 m/s v = Vi + a t 0 = 83.3 + a (1200) a = - .0694 = - 6.94 * 10^-2 m/s^2 average velocity with constant acceleration = (first + last)/2 = 83.3/2 = 41.7 m/s
Sunday, March 30, 2014 at 3:37pm

physics
a car travels on a straight road. a) starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s^2 b) in 4.0 more seconds, the car is going 88 ft/s (60 mi/h). what is the car's average acceleration for this...
Sunday, March 30, 2014 at 3:35pm

physics
modern oil tankers weigh more than a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h. What is the magnitude of a such a ship's ...
Sunday, March 30, 2014 at 3:30pm

physics
750 m/ 20 s 1500 m / 45 s
Sunday, March 30, 2014 at 3:14pm

physics
a race car traveling northward on a straight, level track at a constant speed travels 0.750 km in 20.0 s. the return trip over the same track is made in 25.0 s. a) what is the average velocity if the car in m/s for the first leg of the run? b) what is the average velocity for ...
Sunday, March 30, 2014 at 3:13pm

Physics
5
Sunday, March 30, 2014 at 2:45pm

Physics
The force from the car on the truck = 4420 - 1230 a So our task is to find a total m = 1230 + 2180 = 3410 kg total F = 4420 - 750 = 3670 N so a = 3670/3410 = 1.08 m/s^2 so finally F on truck = 4420 - 1230 (1.08) F on truck = 3096 Newtons
Sunday, March 30, 2014 at 2:36pm

Physics
A 1230 -kg car is pushing an out-of-gear 2180 -kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push horizontally against the ground with a force of 4420N . The rolling friction of the car can be neglected, but the heavier...
Sunday, March 30, 2014 at 2:21pm

physics
a glass lens has a convex surface with a radius 25.0 cm and a concave surface with radius 50.0 cm with the glass refraction = 1.51 calculate the focal length
Sunday, March 30, 2014 at 11:41am

Physics
PLEASE HELP! DUE TOMORROW! In a warehouse crates are placed at the top of a ramp and an employee has to slowly (at a constant velocity) lower them down the ramp. Initially the crates are stationary so the employee needs to start them moving by pulling on them and then push ...
Sunday, March 30, 2014 at 11:28am

physics
Given the atmospheric pressure is 10 5pa what is a gauge pressure of 0.55 mpa equal to?
Sunday, March 30, 2014 at 10:45am

physics
The mass of a vehicle is 4.25 tones concentrate 1.25 meters behind the front wheels what is the force required to jack up the rear wheels?
Sunday, March 30, 2014 at 10:43am

physics
without the drawing...
Sunday, March 30, 2014 at 10:16am

physics
find the difference in PE in the two locations. Hold one charge stationary. PEtotal= kQQ/.1 PE(new total)=KQQ/.06 subtract the first from the second, that must equal the work done. There are more difficult ways to work this, involving finding work in an integral calculus ...
Sunday, March 30, 2014 at 10:11am

physics
F=m*((v^2)/r) Therefore (18.1^2m/s)/80m*3800=F Therefore F=15561N
Sunday, March 30, 2014 at 7:47am

physics
12
Sunday, March 30, 2014 at 3:09am

physics
Two positive charges of 12 µC and 8 µC respectively are 10 cm apart. Find the work done in bringing them 4 cm closer, so that, they are 6 cm apart..
Sunday, March 30, 2014 at 12:45am

Physics
38 cm is the amplitude
Saturday, March 29, 2014 at 9:45pm

Physics
V=90mi/h * 1600m/mi * 1h/3600s.= 40 m/s. a = (V-Vo)/t = (40-0)/0.5 = 80 m/s^2.
Saturday, March 29, 2014 at 8:24pm

Physics
Work = F*h = mg * h = 6*9.8 * 4=235.2 J. Work = F*h = 12 * 5 = 60 J. Work = 5*8 = 40 J. PE = mg*h = 5 * 8 = 40 J.
Saturday, March 29, 2014 at 7:59pm

Physics
L = V/F = 199 m. F = V/199 = 300*10^6/199=1.51*10^6 cy/s= 1.51*10^6 Hz. WL = 1/WC C = 1/W^2*L C=1/(6.28*1.51*10^6)^2*785*10^-6=0.0142 nanofarads.
Saturday, March 29, 2014 at 7:40pm

Math
A physics exam consists of 9 multiple-choice questions and 6 open-ended problems in which all work must be shown. If an examinee must answer 5 of the multiple-choice questions and 2 of the open-ended problems, in how many ways can the questions and problems be chosen?
Saturday, March 29, 2014 at 7:08pm

Physics
How much is the acceleration of a baseball thrown by a pitcher in a major league baseball game, if the ball goes from 0 to 90 mph in a one-half-second time period?
Saturday, March 29, 2014 at 6:09pm

physics
The electric company is supplying energy to the room and it is heating up. We hope she is using a CFL or LED lamp to minimize heating of the room and waste of energy.
Saturday, March 29, 2014 at 6:02pm

physics
Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes. If this room is a closed system, what happens to the total amount of ...
Saturday, March 29, 2014 at 4:00pm

Physics - Torque
The method described here got me the correct answer
Saturday, March 29, 2014 at 3:47pm

Physics!!! :)
The method posted by bobpursley is wrong
Saturday, March 29, 2014 at 3:42pm

physics
The drawing shows three identical springs hanging from the ceiling. Nothing is attached to the first spring, whereas a W = 4.20-N block hangs from the second spring. A block of unknown weight hangs from the third spring. From the drawing, determine the spring constant (in N/m...
Saturday, March 29, 2014 at 3:41pm

Help!! Physics
c = speed of light = 3 * 10^8 m/s 199 = c T T =199/3*10^8 f = 1/T = 300* 10^6/199 = 1.51 * 10^6 Hz omega = 2 pi f = 9.47 * 10^6 omega^2 = 1/(LC) = 89.7*10^12 so C (785 * 10^-6) = (1/89.7) 10^-12 C = (1/70414) 10^-6 = 1.42 * 10^-5*10^-6 = 1.42 * 10-11
Saturday, March 29, 2014 at 11:18am

Help!! Physics
What capacitance in needed in series with an 785 µH inductor to form a circuit that radiates a wavelength of 199 m?
Saturday, March 29, 2014 at 10:49am

physics
If the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury, what is the total pressure of gas supply in cm of water
Saturday, March 29, 2014 at 6:58am

Physics
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 110 Hz has two strings at this frequency. If one string slips from its normal tension of 610 N to 542.00 N, what beat frequency is heard ...
Saturday, March 29, 2014 at 1:31am

Physics
The ship in the figure below travels along a straight line parallel to the shore and a distance d = 580 m from it. The ship's radio receives simultaneous signals of the same frequency from antennas A and B, separated by a distance L = 700 m apart. The signals interfere ...
Saturday, March 29, 2014 at 1:28am

PHYSICS
5 m
Saturday, March 29, 2014 at 1:18am

Physics
A) we pushed back on the snow Therefore Prof. Newton says (Law #3) that the snow pushes forward on us B) 410 forward - 187 backward = 223 N forward C) F = m a 223 = 530 (the driver evidently has no mass:) * a so a = 223/530 = .421 m/s^2 D) v = Vi + a t v = 0 + .421 (7.3) v = 3...
Friday, March 28, 2014 at 10:55pm

Physics
A snowmobile, with a mass of 530 kg, applied a force of 410 N backwards on the snow. a) What force is responsible for the snowmobile’s resulting forward motion? (Hint: Think action–reaction force pairs.) b) If the force of friction on the snowmobile is 187 N ...
Friday, March 28, 2014 at 10:45pm

physics
1
Friday, March 28, 2014 at 10:31pm

Physics
clockwise moments about support (ignoring g which cancels) (50 - 27) m - 27(.31) = 0 23 m = 8.37 m = 0.364
Friday, March 28, 2014 at 10:26pm

Physics
Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.
Friday, March 28, 2014 at 8:48pm

physics
mass 1 accelerates downward at a so mass 2 accelerates up at a tension = T mass 1: m g - T = m a so 3 g - T = 3 a mass 2: T - mg = m a so T = 2 (g+a) substitute T in mass 1 equation 3 g - 2(g+a) = 3 a g - 2 a = 3 a a = g/5 = 9.81/5 = 1.962 You could also use the total mass of ...
Friday, March 28, 2014 at 8:18pm

Physics
f = m a ___ a = f/m c1 ___ a = 150/46 c2 ___ a = 250/46 answers are in m/s^2
Friday, March 28, 2014 at 8:16pm

Physics
Take moment about the left end total mass = 20 + 14 + 39 = 73 kg That is force up from pivot (I am going to do force in kilograms because g will cancel everywhere.) pivot distance from left = 1.4 Distance left to 39 kg = x (our L is (x -1.4) ) moments about left end 14 * 0 - ...
Friday, March 28, 2014 at 7:36pm

Physics
Oops. I just gave the mass of the seesaw on each side. That must be multiplied by the distance of its center of mass: 20(d/4.5)(d/2)+14*1.4 = 20(1 - d/4.5)((4.5-d)/2) + 39L
Friday, March 28, 2014 at 7:28pm

physics
Two masses are hung are connected by a light cord and hung from a frictionless pulley of negligible mad are shown. Mass m1=3.00kg and mass m2=2.00kg. When the two masses are released from rest, the resulting acceleration of the two masses?
Friday, March 28, 2014 at 7:27pm

Physics
so, the mass of the seesaw can be ignored, since it is uniformly distributed. Now for the loads and their moments. They must balance on both sides, so 14*1.4 = 39*L Simple, no? Actually, since I have no diagram, I can't say that the seesaw mass may be ignored. If the pivot...
Friday, March 28, 2014 at 7:26pm

Physics
The seesaw in the figure below is 4.5 m long. Its mass of 20 kg is uniformly distributed. The child on the left end has a mass of 14 kg and is a distance of 1.4 m from the pivot point while a second child of mass 39 kg stands a distance L from the pivot point, keeping the ...
Friday, March 28, 2014 at 6:25pm

Physics
How much work is done in lifting a 6kg object from the ground to a height of 4m? A 12n object is lifted 5m how much work is done How much work is done if a 5n object is lifted from the ground to a height of 8m? How much gravitational potential energy does the object gain?
Friday, March 28, 2014 at 4:04pm

Physics
A wheel of moment of inertia 0.136 kg · m2 is spinning with an angular speed of 5000 rad/s. A torque is applied about an axis perpendicular to the spin axis. If the applied torque has a magnitude of 67.8 N · m, the angular velocity of precession will be? Please ...
Friday, March 28, 2014 at 2:47pm

Physics*
fv
Friday, March 28, 2014 at 2:13pm

Physics
How do I find the answer?
Friday, March 28, 2014 at 12:51pm

Physics
1
Friday, March 28, 2014 at 10:33am

Physics
What capacitance in needed in series with an 785 µH inductor to form a circuit that radiates a wavelength of 199 m?
Friday, March 28, 2014 at 9:51am

Another Physics
At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).
Friday, March 28, 2014 at 6:12am

physics
Thank you steve , please how do you know that each ballon occupies .01617m^3, please if possible give more precisions. I find 0,002746744 which doesn´t make sens to me. How do I make it ? thanks
Friday, March 28, 2014 at 5:09am

physics
Thank you steve , please how do you know that each ballon occupies .01617m^3, please if possible give more precisions.
Friday, March 28, 2014 at 5:05am

atomic physics
What's the difference between excited and unexcited hydrogen?
Friday, March 28, 2014 at 3:55am

Pages: <<Prev | 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