Sunday
April 20, 2014

# Homework Help: Science: Physics

Physics URGENT!!!
Huge shoes^3
Monday, March 24, 2014 at 11:43am

Physics
Balls and weiner.
Monday, March 24, 2014 at 11:42am

Physics
A wooden crate sits on the floor of a flatbed truck that is initially at rest, and the coefficient of static friction between the crate and the floor of the truck is 0.25. The driver of the truck wants to accelerate to a velocity of 20 m/s within 4.0 s. If he does so, will the...
Monday, March 24, 2014 at 11:19am

Physics
Suppose a sled has a mass of 12 kg and a child is exerting a force of magnitude 200 N. Find the angle q at which the normal force N vanishes. What is happening physically when N = 0?
Monday, March 24, 2014 at 11:19am

Physics
An Atwood's machine consists of two crates of different masses. If the pulley is frictionless and massless along with a string of negligible mass, find the acceleration of the crates and the tension in the string
Monday, March 24, 2014 at 11:18am

physics
61
Monday, March 24, 2014 at 10:34am

physics
A 41.0-kg body is moving in the direction of the positive x axis with a speed of 306 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.0 kg, moves away from the point of explosion with a speed of 326 m/s along the positive y axis...
Monday, March 24, 2014 at 9:57am

physics
Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...
Monday, March 24, 2014 at 9:47am

physics
A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original speed. Calculate the final speed of the second...
Monday, March 24, 2014 at 9:45am

Math? Physics??

Monday, March 24, 2014 at 8:14am

physics concepts (please check over my work)
30kgm 6kg 3m/s
Monday, March 24, 2014 at 6:09am

PHYSICS
A subway train is traveling at 80km/h when it approaches a slower train 49m ahead traveling in the same direction at 24km/h
Monday, March 24, 2014 at 12:59am

College Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
Monday, March 24, 2014 at 12:25am

College Physics
The point charges in Figure 17.41 are located at the corners of an equilateral triangle 25.0 cm on a side, where qb = +12.0 µC and qc = -4.50 µC. (Assume that the +x-axis is directed to the right.) (a) Find the electric field at the location of qa. Magnitude ? N/C ...
Monday, March 24, 2014 at 12:18am

college physics
During a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him. The cannon ball has a mass of 10.0 kg and the horizontal component of its velocity is 8.00 m/s when the 65.0-kg performer catches it. If the performer is on nearly frictionless ...
Monday, March 24, 2014 at 12:10am

Physics, Capacitance
The capacitance of a sphere is, C = 4pe0 R = 4p(8.8510-12 F/m * 7108m = 0.078 F. there you go man <3
Monday, March 24, 2014 at 12:07am

Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
Sunday, March 23, 2014 at 11:45pm

physics
during a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him the ball mass is 10.0 kg and ball velocity is 8 m/s while the performer mass is 65 kg. if the performer is on nearly friction-less roller skates, what is his recoil velocity.
Sunday, March 23, 2014 at 11:35pm

Physics
Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 540 V? (b) What is the voltage between...
Sunday, March 23, 2014 at 11:35pm

physics
Two charged bodies exert a force of 0.225 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?
Sunday, March 23, 2014 at 10:40pm

physics
A bicyclist wants to make it from one building to the next. The first building he is standing on is 20 m tall. The building he wants to reach is 12 m tall. He is moving at 4 m/s and the gap between both buildings is 5 m. Will he make it? Please just show me how to break down ...
Sunday, March 23, 2014 at 10:35pm

physics
m*g = 50 * 9.8 = 490 N. = Wt. of crate = Normal force (Fn). a. Fs = u*Fn + u*F*sin30 Fs = 0.75*490 + 0.375F = 367.5 + 0.375F F*cosA-Fs = m*a F*cos30-(367.5+0.375F) = m*0 = 0 0.866F-367.5-0.375F = 0 0.866F-0.375F = 367.5 0.491F = 367.5 F = 748.5 N b. Fs = 0.75*490 - 0.75*F*...
Sunday, March 23, 2014 at 10:33pm

physics
A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it and the concrete is 0....
Sunday, March 23, 2014 at 9:27pm

Physics
you have the initial bullet KE (from initial speed0. You have the spring final energy. energy lost= iniial KE-finalPEspring fraction=energy.lost/initialKE
Sunday, March 23, 2014 at 9:09pm

physics
conservation of momentum; M1V1+M2V2=(M1+M2)V solve for V
Sunday, March 23, 2014 at 9:07pm

Physics
how do u find u1?
Sunday, March 23, 2014 at 9:06pm

physics
train car are coupled together by being bumped into one another. suppose two loaded train cars are moving toward one another, the first having a mass of 150000 kg and velocity of 0.30 m/sand the second havin a mass of 110000 kg and a velocity of (-0.12 m/s). what is their ...
Sunday, March 23, 2014 at 9:05pm

Physics
V^2 = Vo^2 + 2g*h V^2 = 20^2 - 19.6*15 = 106 V = 10.30 m/s.
Sunday, March 23, 2014 at 8:43pm

Physics
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose ...
Sunday, March 23, 2014 at 8:38pm

physics
Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.
Sunday, March 23, 2014 at 8:15pm

physics
a = (V^2-Vo^2)/2d a = (0-(56)^2)/0.036 = -87,111 m/s^2 F = m*a = 850 * (-87,111)=-74,044,444 N.
Sunday, March 23, 2014 at 7:58pm

physics
find the final speed at the end of the first 15 m... vf^2=2ad where a=force/mass solve for Vf. Then use that as Vi here vf^2=vi^2+2ad where a= (F-mu*110g)/mass and d is again 15m solve for vf.
Sunday, March 23, 2014 at 7:57pm

Physics
That's wrong
Sunday, March 23, 2014 at 7:52pm

physics
52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the final speed of the crate?
Sunday, March 23, 2014 at 7:39pm

Physics
Starting with an initial speed of 5.00 m/s at a height of 0.335 m, a 1.75-kg ball swings downward and strikes a 4.40-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.75-kg ball just before ...
Sunday, March 23, 2014 at 7:36pm

Physics
V = 25 + 4 = 29 km/h.
Sunday, March 23, 2014 at 7:19pm

physics
acceleration=v^2/r=8^2/28.2 m/s^2
Sunday, March 23, 2014 at 7:05pm

physics
A runner is moving at a constant speed of 8.00 m/s around a circular track. If the distance from the runner to the center of the track is 28.2 m, what is the centripetal acceleration of the runner?
Sunday, March 23, 2014 at 7:02pm

Physics
A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air. What would be the total distance traveled?
Sunday, March 23, 2014 at 5:53pm

Physics
What would be the total distance traveled?
Sunday, March 23, 2014 at 4:25pm

Physics
A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air.
Sunday, March 23, 2014 at 4:22pm

physics
A light bulb is placed 16.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.40 cm closer to the mirror. Calculate the focal length of the concave mirror. i know that for plane mirrors ...
Sunday, March 23, 2014 at 3:00pm

Physics
if you throw a 0.2 kg ball straight up at 8 m/s how high will it go
Sunday, March 23, 2014 at 2:14pm

Physics
explain the input energy and out put energies of two kitchen machines
Sunday, March 23, 2014 at 2:12pm

Physics
consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make
Sunday, March 23, 2014 at 2:11pm

College Physics
60 J
Sunday, March 23, 2014 at 2:09pm

College Physics
36 J
Sunday, March 23, 2014 at 2:09pm

physics
1.a man leaves the garrage in his house and drives to a neighbouring town which is twenty kilometres away from his house on sight seeing. He returns home to his garrage two hours after. What ir his average velocity from home in km/h?a.10 b.0 c.20 d.40
Sunday, March 23, 2014 at 1:33pm

physics
velocity changed by 20m/s in 10s. So that means an average acceleration of (20m/s)/(10s) = (20/10) m/s^2 = 2 m/s^2 That is, every second, the velocity increased by 2 m/s, thus going from 0 to 20 in 10 seconds.
Sunday, March 23, 2014 at 12:09pm

physics
a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration
Sunday, March 23, 2014 at 11:31am

physics
A particle moves along a straight line such that its position is defined by s = (t3 – 3 t2 + 2 ) m. Determine the velocity of the particle when t = 4 s.
Sunday, March 23, 2014 at 9:43am

physics
Hydraulic engineers in the United States often use, as a units of volume of water, the acre-foot, defined as the volume of water that will cover 1 acre (where 1 acre = 43560 ft2) of land to a depth of 1 ft. A severe thunderstorm dumped 2.6 in. of rain in 30 min on a town of ...
Sunday, March 23, 2014 at 8:02am

physics
The micrometer (1 μm) is often called the micron. (a) How many microns make up 1.5 km? (b) How many centimeters equal 1.5 μm? (c) How many microns are in 1.5 yd?
Sunday, March 23, 2014 at 8:00am

physics
A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in the publishing business is a point, defined as 1/72 inch. What is an area of 0.42 gry2 in points ...
Sunday, March 23, 2014 at 7:58am

physics
Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
Sunday, March 23, 2014 at 7:57am

physics
if you throw a 0.2 kg ball strait up at 8 m/s how high will it go
Sunday, March 23, 2014 at 7:48am

physics
explain the input energy and out put energies of two kitchen machines
Sunday, March 23, 2014 at 7:46am

physics
What are the principles behind seatbelts and air bags that make passengers safer in a collision?
Sunday, March 23, 2014 at 7:43am

physics
consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make
Sunday, March 23, 2014 at 7:42am

physics
B=μ0I/2πr B1 = (4π×10^7)(8.0A)/(2π&time​s;0.030m) B2 = (4π×10^7)(-8.0A)/(2π&tim​es;0.150m) BA = B1 + B2 B1 = (4π×10^7)(8.0A)/(2π&time​s;0.060m) B2 = (4π×10^7)(-8.0A)/(2π&tim​es;-0...
Sunday, March 23, 2014 at 7:32am

physics
From t = 0 to t = 3 min 25 seconds, a man stands still, and from t = 3 min 25 seconds to t = 7 mins 35 s, he walks briskly in a straight line at a constant speed of 1.65 m/s. What is the magnitude of his average velocity vavg over this entire time interval?
Sunday, March 23, 2014 at 4:04am

physics
sdf
Sunday, March 23, 2014 at 3:02am

physics
A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it and the concrete is 0....
Sunday, March 23, 2014 at 1:04am

physics
m*g = 30 * 9.8 = 294 N. = Wt of cabinet. Fs = u*mg = 0.8 * 294 = 235.2 N.
Saturday, March 22, 2014 at 10:50pm

physics
See previous post.
Saturday, March 22, 2014 at 8:59pm

physics
When resistors are connected across a voltage source, the voltage will remain constant if the internal resistance of the source is much smaller than the total resistance connected across the source.
Saturday, March 22, 2014 at 8:57pm

Physics
1.64e12
Saturday, March 22, 2014 at 8:35pm

Physics
m*g = 115 * 9.8 = 1127 N. = Wt of box. Fp = 1127*sin46 = 810.7 N. = Force parallel to the ramp. F-Fp = m*a F - 810.7 = m*0 = 0 F = 810.7 N. Fn = 1127*cos46 = 782.9 N. = Normal force.
Saturday, March 22, 2014 at 8:07pm

Physics
Fo = ((Vs+Vo)/(Vs-Vt))*Ft = 122 Hz ((340+0)/(340-Vt))*118 = 122 (340/(340-Vt))*118 = 122 40,120/(340-Vt) = 122 41,480-122Vt = 40,120 -122Vt = 40,120 - 41,480 = -1360 Vt = 11.15 m/s. = Velocity of the train.
Saturday, March 22, 2014 at 7:37pm

Physics
30days * 24h/day = 720 Hours kW * h = (60/1000)kW * 720h = 43.2 kWh Cost = 43.2kWh * 0.10/kWh = $4.32 Saturday, March 22, 2014 at 5:00pm physics A + B = 220[0o] + 220[120o] R = 220 + 220*cos120 + (220*sin120)I = 220-110 + 190.5i = 110 + 190.5i = 220[60o]. Saturday, March 22, 2014 at 4:40pm Physics That is what the grating is all about ! Saturday, March 22, 2014 at 3:36pm physics A 2400 kg car moving at 11 m/s crashes into a tree and stops in 0.26 s. calculate the force the seat belt exerts on passenger in the car to bring him to a halt the mass of the passenger is 72 kg. Saturday, March 22, 2014 at 3:35pm college physics 2 yes For the same m (lambda) for smaller d, you need BIGGER theta so the peaks on the target will be further apart as d shrinks. Saturday, March 22, 2014 at 3:34pm Physics sin T = l / a Does this tell you anything about the angle of the central fringe, vs the width a? When a is large, T is smaller. Saturday, March 22, 2014 at 3:10pm Physics the 6000 lines/cm has the greatest dispersion Saturday, March 22, 2014 at 3:07pm PHYSICS time in air: 3000/180 seconds heightItFell=1/2 g t^2 Saturday, March 22, 2014 at 3:06pm PHYSICS A plane flying horizontally at 180 m/s drops a box just as it crosses a coastline. The box lands 3 kilometers from the coast. - At what height is the plane flying? - How long it takes to the box to reach the ground ? Saturday, March 22, 2014 at 1:38pm college physics 2 this is the d sin(theta) = m (lambda) I am confused on what its asking now, isn't is d? Saturday, March 22, 2014 at 1:26pm college physics 2 I had that the distance between interference fringes also decrease but I go it wrong Saturday, March 22, 2014 at 1:22pm college physics 2 At a fixed angle from the slits, if you decrease the distance between the slits the path length difference decreases. So, the angle needs to increase to get back to the same path length difference (half the wavelenght for a fringe). Saturday, March 22, 2014 at 1:19pm college physics 2 The first off center maximum occurs when the path lengths to the screen from the two slits differs by one wavelength. If you move the slits closer together, the angle to the screen must increase to get path lengths a wavelength different. Therefore is you decrease the spacing ... Saturday, March 22, 2014 at 1:18pm Physics Consider two diffraction gratings. One grating has 3000 lines per cm, and the other one has 6000 lines per cm. Both gratings are illuminated with a beam of the same monochromatic light. Which grating produces the greater dispersion? Both gratings produce the same dispersion. ... Saturday, March 22, 2014 at 12:46pm Physics A single-slit diffraction pattern is formed on a distant screen. If the width of the single slit through which light passes is reduced, what happens to the width of the central bright fringe? Assume the angles involved remain small. The central bright fringe becomes wider. The... Saturday, March 22, 2014 at 12:46pm college physics 2 A double-slit diffraction pattern is formed on a distant screen. If the separation between the slits decreases, what happens to the distance between interference fringes? Assume the angles involved remain small. A double-slit diffraction pattern is formed on a distant screen. ... Saturday, March 22, 2014 at 12:45pm physics Two beams of coherent light travel different paths, arriving at point P. If the maximum destructive interference is to occur at point P, what should be the path difference between the two waves? Two beams of coherent light travel different paths, arriving at point P. If the ... Saturday, March 22, 2014 at 12:44pm physics In a double-slit experiment, two beams of coherent light traveling different paths arrive on a screen some distance away. What is the path difference between the two waves corresponding to the third bright band out from the central bright band? The path difference between the ... Saturday, March 22, 2014 at 12:44pm physics Two fixed charges 1.07mC and -3.28mC are 61.8 cm apart. Where the third charge may be placed so that no net force acts on it? Saturday, March 22, 2014 at 9:29am Urgent Chemistry The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/... Saturday, March 22, 2014 at 6:42am physics since all the sticks are the same size and mass, the center is just the average of all the (x,y) midpoints: (0,(.32+1.32)/2) ((.33+1.33)/2,0) (.64/2,.768/2) so, the center of mass is at ((0+(.33+1.33)/2+.64/2)/3,((.32+1.32)/2+​0+.768/2)/3) = (0.383,0.401) Saturday, March 22, 2014 at 5:47am Calculus According to my knowledge of physics, s(t) = 135t - 16t^2 Anyway, average velocity = total.distance/total.time So, that would be (s(3)-s(1))/(3-1) Saturday, March 22, 2014 at 5:36am physics/calc An anchor weighing 110 lb in water is attached to a chain weighing 2 lb/ft in water. Find the work done to haul the anchor and chain to the surface of the water from a depth of 35 ft. Friday, March 21, 2014 at 11:14pm Physics You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if the pulling ... Friday, March 21, 2014 at 10:19pm physics Three identical uniform meter sticks are placed on the floor. The first stick lies along the y axis from y = 0.320 m to y = 1.32 m. The second stick lies along the x axis from x = 0.330 m to x = 1.33 m. The third stick is positioned so that one end is on the x axis at x = 0.... Friday, March 21, 2014 at 10:01pm physics A solid block of mass m2 = 1.0$kg\$, at rest on a horizontal frictionless surface, is connected to a relaxed spring (with spring constant k = 260 N/m whose other end is fixed. Another solid block of mass m1 = 2.4 kg and speed v1 = 3.3 m/s collides with the 1.00 kg block. If ...
Friday, March 21, 2014 at 9:54pm

Physics
I just found out for part a that you would do: 1075*9.8*230*sin(17.5) which would then equal: 726915 I still need help with part b though.
Friday, March 21, 2014 at 9:38pm

physics
Speed = 1/0.005 = 200 On-States/s.
Friday, March 21, 2014 at 9:35pm

Physics
P = F*V = F * 32.1 = 2614 J/s. = 2614 W. F = 81.43 N.
Friday, March 21, 2014 at 9:25pm

Physics
A 300 kg piano slides 4.4 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.(a) Calculate the magnitude of the force exerted by the man.(b) Calculate the work...
Friday, March 21, 2014 at 9:17pm

Physics
What is the minimum work needed to push a 1075 kg car 230 m up along a 17.5° incline? (a) Ignore friction. (b) Assume the effective coefficient of friction retarding the car is 0.30?
Friday, March 21, 2014 at 9:06pm

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