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April 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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
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

physics
A special train is traveling down a long, straight track with a constant acceleration of 9m/s^2 in the forward direction. The train is located on Mars where the acceleration due to gravity is 9 m/s^2. If a passenger drops a ball and measures the acceleration of the ball, the ...
Sunday, April 6, 2014 at 8:43pm

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 8:43pm

college physics
dsf
Sunday, April 6, 2014 at 8:42pm

physics
z = 5 * 10^5 ohms i = 1/(5*`10^6) = .2 *10^-6 = 2 *10^-7
Sunday, April 6, 2014 at 8:18pm

physics
http://hyperphysics.phy-astr.gsu.edu/hba​se/electric/rlcser.html
Sunday, April 6, 2014 at 8:08pm

Physics
Va=63rev/min * 6.28rad/rev * 1min/60s= 6.594 rad/s. Angle=0.57 + 6.594rad/s*9.5s=63.21 rad. or 0.4132 rad.
Sunday, April 6, 2014 at 7:46pm

College Physics
A
Sunday, April 6, 2014 at 7:36pm

physics
A series RLC circuit is made with a C=100pF capacitor, an L=100μH inductor, and an R=30Ω resistor. The circuit is driven at 5×106rad/s with a 1V amplitude. What is the current oscillation amplitude in amps
Sunday, April 6, 2014 at 5:04pm

Physics
In the device a 50g mass is hung from a pulley and released. A disk is placed on the platform. The platform has a radius of 5cm. The disk and platform go from rest to an angular velocity of 8.5rad/s in 2.5 seconds. What is the moment of inertia of the disk? What is its mass? ...
Sunday, April 6, 2014 at 4:56pm

Physics
8
Sunday, April 6, 2014 at 4:50pm

Physics
conservation of momentum initial=final 1500*25East=(1500+2000)V solve for V
Sunday, April 6, 2014 at 3:42pm

Physics
Boxcar A, with a 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 boxcars collide inelastically and move together after they get stuck. What is their combined velocity?
Sunday, April 6, 2014 at 3:41pm

physics
Isn't this Biot-Savat law? http://dev.physicslab.org/Document.aspx?​doctype=3&filename=Magnetism_BiotSavartL​aw.xml
Sunday, April 6, 2014 at 3:40pm

Physics
it takes time=.2 seconds to get there, so it falls h=1/2 g t^2=4.9*.04 meters
Sunday, April 6, 2014 at 3:29pm

Physics
A bullet is fired horizontally with a speed of 100 m/s aiming at a target 20m away. It misses the target by??
Sunday, April 6, 2014 at 2:58pm

physics
9.8/8.4 answer: 1.16666
Sunday, April 6, 2014 at 2:34pm

physics
adfasdfasdfawerwefasefaseasefasefasdfase​fasefasefaefa
Sunday, April 6, 2014 at 2:27pm

physics
ghf
Sunday, April 6, 2014 at 1:31pm

Math/Physics
when Tyson left at 11:00, Rashad had already gone 200km, so the two were 580 km apart. They approached each other at 180 km/hr, meaning they met in 3 2/9 hours. So, by the time they met at 2:13:20, Tyson had gone 257.8 km.
Sunday, April 6, 2014 at 1:18pm

cape1 physics
thanks for the example.
Sunday, April 6, 2014 at 1:13pm

cape1 physics
a hammer is often used to force a nail into wood.the faster the hammer moves,the deeper the nail moves into the wood.
Sunday, April 6, 2014 at 12:56pm

Math/Physics
Problem Question: Rashad started The 780km drive from Sault st. Marie to Ottawa at 09:00. His average speed was 100km/h. Two hours later Tyson left Ottawa for Sault St. Marie. He drove at 80km/h on the same highway. How far from Ottawa, and what time of day did they meet?
Sunday, April 6, 2014 at 12:26pm

physics
A lightning bolt may carry a current of 1.00 ✕ 104 A for a short time interval. What is the resulting magnetic field 134 m from the bolt? Assume that the bolt extends far above and below the point of observation.
Sunday, April 6, 2014 at 12:14pm

physics
A series RLC circuit is made with a C=100pF capacitor, an L=100μH inductor, and an R=30Ω resistor. The circuit is driven at 5×106rad/s with a 1V amplitude. What is the current oscillation amplitude in amps
Sunday, April 6, 2014 at 10:40am

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 8:59am

Physics--PLZ HELP!
5
Sunday, April 6, 2014 at 7:11am

Physics
sfsadf
Sunday, April 6, 2014 at 2:01am

Physics
Correction: Vo = 460.6 rad/s V = 45 rad/s a = -84.3 rad/s^2
Saturday, April 5, 2014 at 9:49pm

Physics
Vo=4401rev/min * 6.28rad/rev * 1min/60s= 460.6 m/s V = 430 * 6.28/60 = 45 m/s. a=(V-Vo)/t = (45-460.6)/4.93=-84.3 m/s^2
Saturday, April 5, 2014 at 9:45pm

physics
Depth = V*T = 1530 * 3.65/2 = 2792 m.
Saturday, April 5, 2014 at 9:15pm

PHYSICS
V = Vo + g*Tr = 0 14 - 9.8Tr = 0 9.8Tr = 14 Tr = 1.43 s. = Rise time. h = ho + Vo*Tr + 0.5g*Tr^2 hmax = 70 + (14*1.43 -4.9*1.43^2)=80 m. Above gnd. hmax = 0.5g*t^2 = 80 4.9t^2 = 80 t^2 = 16.33 Tf = 4.04 s = Fall time. Tr+Tf = 1.43 + 4.04 = 5.47 s. = Time to strike gnd. V=Vo + ...
Saturday, April 5, 2014 at 9:01pm

physics
A brass ring of diameter 10.00 cm at 22.2°C is heated and slipped over an aluminum rod of diameter 10.01 cm at 22.2°C. Assume the average coefficients of linear expansion are constant. (b) What if the aluminum rod were 9.16 cm in diameter?
Saturday, April 5, 2014 at 8:53pm

physics
Incomplete.
Saturday, April 5, 2014 at 7:41pm

physics
PE = m*V^2 = 0.164 J. .0508*V^2 = 0.164 V^2 = 3.228 V = 1.80 m/s.
Saturday, April 5, 2014 at 7:33pm

Physics
delta L/L = (T/area) / E = (215*9.81 /2*10^-5) / 8*10^10 = ( 1054 * 10^5 ) / 8*10^10 = 132 * 10-5 so delta L = (3.5)(132*10^-5) = 461 * 10^-5 = .00461 meters = .461 cm
Saturday, April 5, 2014 at 6:32pm

Physics
Tension in cable = T Force up at end from cable = T sin 37 compression Force toward wall = T cos 37 max friction force = .485 T cos 37 up vertical forces on rod sum to 0 2 Fg = .485 T cos 37 + T sin 37 2 Fg = .989 T T = 2.02 Fg take moments about intersection of rod and wall ...
Saturday, April 5, 2014 at 6:26pm

Physics 141
Thank you so much for your time and help!
Saturday, April 5, 2014 at 6:16pm

physics (forces)
h
Saturday, April 5, 2014 at 6:02pm

Physics
A 215-kg load is hung on a wire of length of 3.50 m, cross-sectional area 2.000x10^-5 m2, and Young's modulus 8.00x 10^10 N/m2. What is its increase in length?
Saturday, April 5, 2014 at 5:36pm

Physics
One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the wall and the...
Saturday, April 5, 2014 at 5:35pm

physics
(1/2) L i^2 = (1/2) C V^2 i^2 = (C/L) V^2 i^2 = (3.1*10^-6 / 5.6*10^-3) (961) i^2 = 532 * 10^-3 = 53.2 * 10^-4 i = 7.3 * 10^-2 = .073 amps
Saturday, April 5, 2014 at 5:21pm

physics
period = 1/frequency = (1/7.01)*10^-18 wavelength = 3*10^8 (1/7.01)*10^-18 = .428 * 19^-10 = 4.28 * 10^-11 meters
Saturday, April 5, 2014 at 5:12pm

Physics 141
Hey. I just did that.
Saturday, April 5, 2014 at 5:04pm

Physics 141
Distance axle above step edge = .33 - .125 = .205 Angle T is angle between straight down from Axle and the top edge of the step so cos T = .205/.33 T = 10.58 deg sin T = .184 Take moments about the top edge of the step. F * .205 clockwise (my step is on the right) m g * .33 ...
Saturday, April 5, 2014 at 5:04pm

Physics 141
A bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude of vector F increases, there comes a ...
Saturday, April 5, 2014 at 4:54pm

Physics 141
THANK YOU SO MUCH!
Saturday, April 5, 2014 at 4:53pm

Physics 141
T = 1/4 so f = 4
Saturday, April 5, 2014 at 4:51pm

Physics 141
after one period T, (8 pi T) = 2 pi so T = 1/4 so f = 1/T = 4
Saturday, April 5, 2014 at 4:50pm

Physics 141
The drawing shows a bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude of vector F increases...
Saturday, April 5, 2014 at 4:30pm

Physics 141
x=3.5cos(8pi.t) Amplitude=3.5m Frequency?
Saturday, April 5, 2014 at 4:11pm

Physics 141
x=3.5Cos(8pi.t) Amplitude=3.5m What is the frequency?
Saturday, April 5, 2014 at 4:08pm

Physics
Acceleration due to gravity is independent of mass, but the force is not. Determine the final velocity of the following objects and the force generated by the same objects as they are dropped from the given heights. 10 kg 2.5 meters 7 kg 5.5 meters 0.5 kg 12 meters 0.7 kg 5 ...
Saturday, April 5, 2014 at 2:17pm

physics
Yes
Saturday, April 5, 2014 at 12:51pm

physics
thanks!
Saturday, April 5, 2014 at 12:06pm

physics
You can solve for Emax by this S=(1/munaught*2*speedlight)Em^2 Then solve for Bmax from Em/Bm= speedlight then the rms value of each is 1/sqrt2 * max value
Saturday, April 5, 2014 at 12:05pm

physics
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.13 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? (a) electric field (b) magnetic field
Saturday, April 5, 2014 at 11:41am

physics
A 3.1-µF capacitor has a voltage of 31 V between its plates. What must be the current in a 5.6-mH inductor so that the energy stored in the inductor equals the energy stored in the capacitor?
Saturday, April 5, 2014 at 11:36am

physics
In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 7.01 1018 Hz. What is the wavelength in vacuum of these X-rays?
Saturday, April 5, 2014 at 11:36am

Physics
I dont understand.
Saturday, April 5, 2014 at 9:18am

College Physics
Two forces, F⃗ 1 and F⃗ 2, act at a point, as shown in the picture. (Figure 1) F⃗ 1 has a magnitude of 8.20N and is directed at an angle of α = 55.0∘ above the negative x axis in the second quadrant. F⃗ 2 has a magnitude of 6.40N and is ...
Saturday, April 5, 2014 at 6:48am

physics
you need v such that 3i + 4j + 2(xi+yj) = 0 3+2x = 0 4+2y = 0 v = -3/2 i -2j now just get the magnitude and direction.
Saturday, April 5, 2014 at 5:46am

physics
A bomb of mass M at rest explodes into three pieces in the ratio 1 : 1 : 2. The smaller ones are thrown off in perpendicular directions with velocities 3 ms−1 and 4 ms−1. What is the velocity of the third piece after the explosion?
Saturday, April 5, 2014 at 1:33am

Physics
f=[fy.fx].N
Saturday, April 5, 2014 at 1:17am

Physics
..
Friday, April 4, 2014 at 10:54pm

physics.
The liquid with the highest density will have the largest percentage of its' volume above the water. Find the density of each liquid and compare them.
Friday, April 4, 2014 at 10:28pm

Physics
d = V*t = 1500m/s * 1.5/2 = 1125 m.
Friday, April 4, 2014 at 10:03pm

PHYSICS!!!
T = d/V = 200/7 = 28.57 s.
Friday, April 4, 2014 at 9:56pm

physics
P = F * d/t = mg * d/t P = 66*9.8 * 14/44 Joules/s.
Friday, April 4, 2014 at 9:47pm

Physics Help
L = V(1/F) + 0 Slope = V. V is a constant. y-intercept = 0
Friday, April 4, 2014 at 9:26pm

physics
All of the parameters change.
Friday, April 4, 2014 at 8:51pm

Physics
A pitcher throws a 0.192-kg baseball, and it approaches the bat at a speed of 43.2 m/s. The bat does 69.8 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 32.6 m above the point of impact.
Friday, April 4, 2014 at 8:49pm

Physics
change PE= min work min work= GMm/r1-GMm/R2 M mass of moon, m is mass of lunar
Friday, April 4, 2014 at 8:35pm

Physics
Use symettry as you integrate across. Starting from one side, all you want to add is the horizontal component (the vertical component will be oposite direction when you get to the other side). So integrate the cosine/sine Theta part of the angle only (theta equals an angle ...
Friday, April 4, 2014 at 8:32pm

Physics
I'm having trouble setting up/solving this physics problem? Can someone please help me? Thank you. A 4700 kg lunar lander is in orbit 45 km above the surface of the moon. It needs to move out to a 340-km-high orbit in order to link up with the mother ship that will take ...
Friday, April 4, 2014 at 8:02pm

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? I have tried using the integration method but cannot get...
Friday, April 4, 2014 at 7:27pm

physics
Two manned satellites approaching one another at a relative speed of 0.500 m/s intend to dock. The first has a mass of 3.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. Assume that the positive direction is directed from the second satellite towards the ...
Friday, April 4, 2014 at 6:52pm

Physics
work done = increase in kinetic energy (here we have a decrease so the work is negative. The force is opposite to the direction of motion) work = (1/2)(4.5*10^4)(5000^2 - 7000^2) work = force *distance moved in direction of force so Force = work/(1.4*10^6)
Friday, April 4, 2014 at 6:45pm

physics. PLEASE HELP
If it is 50 meters high, the pressure is the weight of a one meter square column 50 meters high. Water density is about 1000 Kilograms/ cubic meter So the mass of this column is 1000 Kg/m^3 * 50 m * g or 1000 * 50 * 9.81 = 490,500 Newtons that weight is spread out over the one...
Friday, April 4, 2014 at 6:39pm

physics. PLEASE HELP
Where do I start? Calculate the water pressure at the bottom of the 50-m {\rm m}-high water tower shown in the photo. Express your answer to two significant figures and include the appropriate units. The question says to neglect the pressure due to atmosphere when doing my ...
Friday, April 4, 2014 at 6:23pm

Physics
An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7000 to 5000m/s. (a) What is the work done by the force? (b) If the ...
Friday, April 4, 2014 at 6:22pm

PHYSICS
KE= 1/2 I w^2 I for a solid disk= 1/2 m r^2 w= rad/sec= 2PI*2300rad/min*1min/60sec
Friday, April 4, 2014 at 5:50pm

Physics
energy stored in spring=PE lost bycrate 1/2 k .24^2=5*9.8*(2.0+.24)^2 solve for k
Friday, April 4, 2014 at 5:45pm

PHYSICS
A grinding wheel 0.3m in diametre has amass of 5kg is rotating at an angular velocity of 2300rev/min.what is the kinetic energy?
Friday, April 4, 2014 at 4:23pm

PHYSICS
A grinding wheel 0.3m in diametre has amass of 5kg is rotating at an angular velocity of 2300rev/min.what is the kinetic energy?
Friday, April 4, 2014 at 4:16pm

Physics
a 5 kg crate falls from a height of 2.0 m into an industrial spring scale. When the crate comes to rest the compression of the spring is 24 cm. what is the spring constant?
Friday, April 4, 2014 at 4:09pm

Algebra
I can't figure this out.. A physics student stands at the top of hill that has an elevation of 37 meters. He throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y = –...
Friday, April 4, 2014 at 3:04pm

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