Wednesday
April 16, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

Post a New Question | Current Questions

Physics
336
Friday, March 21, 2014 at 4:59pm

physics
Air friction depends on the area of a an object
Friday, March 21, 2014 at 4:49pm

Physics
A ball is traveling down a straight track at 20 m/s. How fast will the ball's speed be after it climbs a hill in the track that is 15 m high?
Friday, March 21, 2014 at 4:43pm

Physics
A bullet is fired into a block of wood with speed 250 m/s. The block is attached to a spring that has a spring of 200 N/m. The block embedded bullet compresses the spring a distance of 30.0 cm to the right. Determine the mass of the wooden block
Friday, March 21, 2014 at 4:07pm

Physics
nvm, i think my above answer is wrong i got another answer .39 J/g*k is this right???
Friday, March 21, 2014 at 3:57pm

Physics
2,340 / 0.20 / 50.0 = i got 234 as an answer?? is it right?
Friday, March 21, 2014 at 3:42pm

physics
explain why a flat sheet of paper and a sheet of paper crumpled into a ball which are dropped from a height of 2 meters will not accelerate at the same rate?
Friday, March 21, 2014 at 3:36pm

Physics
Help please A 200.0 g copper block absorbs 2.34 × 10^3 J of heat to raise its temperature by 30.0 K. What is the specific heat of copper?
Friday, March 21, 2014 at 3:33pm

physics
If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore? A, 21 km/h B, 29km/h C, 25 km/h D, 4 km/h
Friday, March 21, 2014 at 2:56pm

college physics

Friday, March 21, 2014 at 2:16pm

Physics
A train is moving at a speed of 30 m/s toward a stationary observer at a train station. The train whistle blows with an actual frequency of 336 Hz. What horn frequency is heard by the engineer (riding on the train)?
Friday, March 21, 2014 at 12:19pm

physics
There has to be more to this question.
Friday, March 21, 2014 at 9:23am

physics
Explain why voltage is constant when connecting resistance
Friday, March 21, 2014 at 7:23am

Physics
A rifle with a mass of 1.2 kg fires a bullet with a mass of 6.0 (0.006kg). The bullet moves with a muzzle velocity of 600 m/s after the rifle is fired. a. What is the momentum of the bullet after the rifle is fired? b. If external forces acting on the rifle can be ignored, ...
Friday, March 21, 2014 at 6:58am

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/...
Friday, March 21, 2014 at 6:31am

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/...
Friday, March 21, 2014 at 6:31am

physics
An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850kg traveling initially at a speed of 56.0km/h in a distance equal to the diameter of a dime, which is 1.8cm ?
Friday, March 21, 2014 at 5:06am

physics
I think it's still 550, the wind doesn't change the ground's frame of reference.
Friday, March 21, 2014 at 5:03am

physics
if an airplane is traveling at 550 km/h into a head wind with a velocity of 40km/h what is the airplanes velocity relative to the ground
Friday, March 21, 2014 at 4:55am

Physics
If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore?
Friday, March 21, 2014 at 4:31am

Physics
this question has been solved and will no longer need to be answered.
Thursday, March 20, 2014 at 10:39pm

physics
what about if the velocity is 3.5m/s?
Thursday, March 20, 2014 at 10:33pm

Physics
A Green light wave is traveling a rate of 3*10^8 m/s and a wavelength of 561 m. How fast would a red wave with a wavelength of 447m travel?
Thursday, March 20, 2014 at 10:16pm

Physics
SOLVED, no need to answer this anymore
Thursday, March 20, 2014 at 10:09pm

Physics
Answer is wrong.
Thursday, March 20, 2014 at 10:01pm

Physics
P = F*V = 2614 Watts = 2614 Joules/s. F * 32.1 = 2614 F = 81.43 N.
Thursday, March 20, 2014 at 10:00pm

Physics
An electromagnetic wave has a frequency of 2.04 x 10^12 Hz, What is the wavelength of this EM wave?
Thursday, March 20, 2014 at 9:51pm

Physics
thank you so much!!!
Thursday, March 20, 2014 at 8:24pm

Physics
thanks!
Thursday, March 20, 2014 at 8:23pm

Language arts help!!
1–6, read the play excerpt below and answer the questions that follow. Jaws of the Water ACT TWO At rise we see DAD, TINA, and MARK rushing in and out of the living room. Each enters carrying important items—such as sleeping bags, rain gear, and gallons of water—...
Thursday, March 20, 2014 at 8:20pm

physics
Vb = (Dc/Dw)*Vc = (100/1000)*Vc = 3 m^3 0.1Vc = 3 Vc = 30 m^3. = Vol. of cylinder.
Thursday, March 20, 2014 at 7:42pm

Physics
nvm
Thursday, March 20, 2014 at 7:41pm

Physics
I don't understand this question... What is the change in entropy for a system that has 250 J of heat added to it at 25°C? (Points : 1) 10 J/K 0.84 J/K 0.84 J/K 10 J/K
Thursday, March 20, 2014 at 7:32pm

Physics
nvm.. i found this one out...
Thursday, March 20, 2014 at 7:08pm

Physics
A 4700 kg vehicle on a level surface experiences a force applied due to the engine of 3700 N forward. If the force of friction acting on the vehicle is 189 N backward: Determine the values of the other forces acting on the vehicle. Draw a free body diagram and determine the ...
Thursday, March 20, 2014 at 6:53pm

Physics
The blocks move with the same acceleration ‘a’ F(fr)= μN m₁g=W₁ => m₁=W₁/g= 77/9.8=7.86 kg m₂g=W₂ => m₂=W₂/g= 114/9.8=11.63 kg x: m₁a=m₁g•sin α -μ₁N₁-T y: 0=-m₁g...
Thursday, March 20, 2014 at 6:51pm

Physics
How much heat is required to completely boil away 0.200 kg of water (Hv = 2.26 × 10^3 kJ/kg)? (Points : 1) 4.52 × 102 kJ 2.26 × 103 kJ 4.52 × 103 kJ 1.13 × 104 kJ
Thursday, March 20, 2014 at 6:45pm

physics
Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static friction between the filing cabinet and the floor is 0.80.What is the magnitude of the friction force on the filing cabinet? Express your answer to two...
Thursday, March 20, 2014 at 6:31pm

physics
1. PE=KE PE=mgh=mg•s•sinα KE=mv²/2 mg•s•sinα=mv²/2 v=sqrt(2g•s•sinα) = =sqrt(2•9.8•1.8•sin22°​;)=3.64 m/s v=at => a=v/t s=at²/2= vt²/2t=vt/2 t=2s/v=2•1.8/3.64 =0.99 s 2. t₁=...
Thursday, March 20, 2014 at 6:30pm

Physics
T=ma=mv²/L m=TL/v²
Thursday, March 20, 2014 at 6:04pm

physics
If the electron experiences a force of 5.6 x 10-6 N, how large is the field between the deflection plates?
Thursday, March 20, 2014 at 6:03pm

Physics
An angular speed ω=v₁/R₁=v₂/R̀​2; v₁/v₂= R₁/R₂=9.8/6.6 =1.48
Thursday, March 20, 2014 at 6:02pm

Physics
T=ma=mv²/R=1.9•2.8²/2.3= 6.48 N
Thursday, March 20, 2014 at 5:58pm

Physics
B= μ₀•I/2π•d= μ₀•q•t/2π•​;d q=2π•d•B/ μ₀•t= =2π•28•7.3•10⁻​⁵/4π•10⁻⁷​49;2.2•10⁻³=4.64•10​...
Thursday, March 20, 2014 at 5:54pm

Physics
P=Fv F=P/v = 2614/32.1 =81.43 N
Thursday, March 20, 2014 at 5:48pm

Physics
Two boxes of mass 7.40 and 7.00 kg are in contact and are accelerated across a horizontal surface by an force of 51.49 N applied parallel to the surface and pushing on the lighter box. The magnitude of the frictional force between the surface and the lighter mass is 9.26 N and...
Thursday, March 20, 2014 at 5:32pm

Physics
A box of sand (initially at rest) is pulled along a horizontal floor by a cable with a breaking strength of 1090.0 N. The coefficient of static friction between the box and the ground is 0.28. What should the angle between the cable and the floor be in order to move the ...
Thursday, March 20, 2014 at 5:29pm

Physics
Two blocks of weights 77.0 and 114.0 N are connected by as massless string and slide down an inclined plane making an angle of 45.0 deg. to the horizontal. The cofficient of kinetic friction between the lighter block and the plane is 0.15 and that between the heavier block and...
Thursday, March 20, 2014 at 5:23pm

physics
Explain why voltage doesn't change when connecting resistance in series
Thursday, March 20, 2014 at 5:22pm

physics
Explain why voltage is constant when connecting resistance in series
Thursday, March 20, 2014 at 5:21pm

physics
A box of mass 5.0 kg starting from rest slides down a 1.8 m long ramp inclined at an angle of 22.0 deg. from the horizontal. If the ramp is frictionless, how long will it take the box, starting from rest, to reach the bottom of the ramp? if the frictionless ramp is replaced ...
Thursday, March 20, 2014 at 5:16pm

Physics
A 115.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 46.0 deg with the horizontal. Find the magnitude of the applied force F. what is the magnitude of the normal force between the ramp and the box?
Thursday, March 20, 2014 at 5:06pm

Physics
219 * (4.12/11.2)
Thursday, March 20, 2014 at 4:47pm

physics
the metal was moving in the direction the gas was pushing. That is positive work. As for the first part, figure out how many mols of water vapor you have and how many mols of air, Then do PV = nRT to get partial pressures of each. That final pressure inside is ten times ...
Thursday, March 20, 2014 at 4:42pm

Physics
L is the length of the solenoid N is the number of turns d is the diameter of the wire r is the radius of the solenoid (of the turn) Resistance R=ρx/A=4ρx/πd² ρ=1.6•10⁻⁸ Ω•m μ₀=4π•10⁻S​11; ...
Thursday, March 20, 2014 at 4:39pm

Physics?
Please don't type in all-caps ... it's very hard to read. And please have patience while waiting for a tutor who understands this stuff!!
Thursday, March 20, 2014 at 4:36pm

physics
I once was given a metal whiskey flask for being in my cousin’s wedding. When it got dented, I put in 1 gram of H2O (initially 21°C, just like the air filling the rest of the flask) and heated it up to boil the water. It popped the dent out. Assume the flask had a ...
Thursday, March 20, 2014 at 4:13pm

physics
9m/s
Thursday, March 20, 2014 at 4:12pm

Physics
4m/s
Thursday, March 20, 2014 at 4:03pm

physics
suck a dick
Thursday, March 20, 2014 at 3:14pm

Physics
I figured out the right equation. It is B=mu*n*I but I still don't know how to figure out what I is
Thursday, March 20, 2014 at 2:47pm

Physics
A 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days? Please show how to work this
Thursday, March 20, 2014 at 2:45pm

Physics
An ice puck of mass m revolves on an icy surface in a circle at speed v at the end of a horizontal string of length L. The tension in the string is T Find the mass of the puck when the length of the string is 2.2m , string tension is 5.0N , and the tangential speed of the puck...
Thursday, March 20, 2014 at 2:33pm

Physics
An ice puck of mass m revolves on an icy surface in a circle at speed v at the end of a horizontal string of length L. The tension in the string is T Write the equation for centripetal force, and substitute the values T and L appropriately. Then with a bit of elementary ...
Thursday, March 20, 2014 at 2:32pm

Physics
The diameter of the base of a tapered drinking cup is 6.6cm . The diameter of its mouth is 9.8cm . The path of the cup curves when you roll it on the top of a table. How much faster does the mouth move than the base? Express your answer using two significant figures.
Thursday, March 20, 2014 at 2:27pm

Physics
Calculate the tension in a horizontal string that whirls a 1.9-kg toy in a circle of radius 2.3m when it moves at 2.8m/s on an icy surface. Express your answer to two significant figures and include the appropriate units. 1.9(2.8)^2 .. then divid by 2.3 I got 12.30 N , is this...
Thursday, March 20, 2014 at 2:25pm

Physics
to calculate turns/length, would it be N/R = 2B/mu*I? but then what is my I value? or am I going about this the completely wrong way?
Thursday, March 20, 2014 at 1:58pm

Physics
In a lightning bolt, a large amount of charge flows during a time of 2.2 10-3 s. Assume that the bolt can be treated as a long, straight line of current. At a perpendicular distance of 28 m from the bolt, a magnetic field of 7.3 10-5 T is measured. How much charge has flowed ...
Thursday, March 20, 2014 at 1:56pm

Physics
Why is using mirrors to generate electricity not a common practice?
Thursday, March 20, 2014 at 1:41pm

Physics
During a tennis serve, the ball goes from rest to approximately 32.1 m/s. The average power generated during the serve is equal to 2614 Watts. If the acceleration is constant during the serve, what is the magnitude of the force acting on the ball?(? N)
Thursday, March 20, 2014 at 1:31pm

Physics
resistance is halved, so current is doubled.
Thursday, March 20, 2014 at 1:29pm

Physics
calculete turns/length as in the hint. Then use your formula.
Thursday, March 20, 2014 at 1:29pm

Physics
you have two 30 ohms in parallel, total effective resistance 15 ohms, in a 120 battery (wow), current=120/15 amps
Thursday, March 20, 2014 at 1:28pm

Physics
V/rparallel=6.35 V/rsum=1.2 rsum=12/1.2=you do it. R1+R2=rsum=above then r2=abovesum-r1 rparallel=12/6.35 or r1r2/(r1+r2)=12/6.35 r1(abovesum-r1)=12/6.35 (r1+12-r1) and that quickly solves as a quadratic. check my math, I did it in my head.
Thursday, March 20, 2014 at 1:27pm

Physics
A solenoid is formed by winding 25.3 m of insulated silver wire around a hollow cylinder. The turns are wound as closely as possible without overlapping, and the insulating coat on the wire is negligibly thin. When the solenoid is connected to an ideal (no internal resistance...
Thursday, March 20, 2014 at 1:20pm

Physics
When two resistors are connected in series across a 12-V battery, 1.1A flows. When they are connected in parallel across the same battery, 6.3A flows. What is the smaller resistor's value?
Thursday, March 20, 2014 at 1:06pm

Physics
A 10-ohm resistor is attached to a 20-ohm resistor in series. This combination is then attached to a 30-ohm resistor in parallel. This is then connected to a 120-V battery. What is the current drawn from the battery?
Thursday, March 20, 2014 at 1:05pm

Physics
A direct current power supply is connected to a circuit containing one resistor, and 1.5 A is drawn. If a second identical resistor is connected to the power supply in parallel with the first, how much current is drawn from the battery?
Thursday, March 20, 2014 at 1:01pm

physics
two vectors A and B each have magnitude 220 and angle BETWEEN THEM IS 120 WHAT WILL BE RESULTANT?
Thursday, March 20, 2014 at 12:28pm

Physics
Ten cars at an intersection are blowing their horns simultaneously, creating a 98 decibel sound in the middle of the intersection. What is the average sound level for each car?
Thursday, March 20, 2014 at 11:06am

Physics
A train blows its horn as it approaches a crossing. The train engineer observes a frequency of 118 Hz and a stationary observer observes a frequency of 122 Hz. What is the speed of the train? Use the speed of sound as 340m/sec
Thursday, March 20, 2014 at 10:34am

Physics
If a piano tuner hears 3 beats each second when listening to a 8 Hz tuning fork and a single string on the piano which is of higher frequency.. What is the frequency of the single string from the piano?
Thursday, March 20, 2014 at 10:33am

physics
It is hard to tell without the velocity.
Thursday, March 20, 2014 at 10:25am

physics
What is the momentum of the 200 g cart BEFORE the collision (LEAVE OUT units of kgm/s)? please help.
Thursday, March 20, 2014 at 9:31am

physics
if the cart in the last question collides INELASTICALLY with a stationary cart of mass 150 g, what is the kinetic energy of the carts after the collision (LEAVE OUT units of J)?
Thursday, March 20, 2014 at 9:29am

physics
If a cart is initially travelling at 3.5 m/s, and has a mass of 200g, what is it's kinetic energy (LEAVE OUT units of J)?
Thursday, March 20, 2014 at 9:27am

physics
If the speed of the cart at the first photogate is 2.3 m/s, and the speed of the cart at the first photogate is 1.8 m/s, what is the percentage change in the speed of the cart (LEAVE OUT the % symbol)?
Thursday, March 20, 2014 at 9:25am

physics
If the average time from one on state to the next one on the first photogate is 0.005 seconds, what is the speed of the cart at this point (LEAVE OUT the units of m/s)?
Thursday, March 20, 2014 at 9:19am

Physics
During a tennis serve, the ball goes from rest to approximately 32.1 m/s. The average power generated during the serve is equal to 2614 Watts. If the acceleration is constant during the serve, what is the magnitude of the force acting on the ball?(? N)
Thursday, March 20, 2014 at 8:23am

physics
u aint cool u dont know anything u GOT IT WRONG!!!!!!!!!!!!
Thursday, March 20, 2014 at 7:58am

Physics
If you have three waves corresponding to to the lowest three frequencies of vibrations of a 30 cm air column, what is the wavelength of the standing wave in each case? What frequency is heard in each pipe? The only information I have is that the speed of sound in air is 331 m/s
Thursday, March 20, 2014 at 6:02am

physics
sin 27=0.45=59/x => x=115.69 tan27=0.51=59/y => y=131.11 ratio=y/x => ratio= 1.1
Thursday, March 20, 2014 at 4:52am

Physics.
m v^2/r = 1.9 (2.8)^2/2.3 Newtons
Thursday, March 20, 2014 at 4:29am

Physics
Ac = v^2/r F = m Ac = m v^2/r = 80 (3.2^2)/2.4 = 341 N = 340 N to two figures
Thursday, March 20, 2014 at 4:27am

Physics
A Plane flies north at 215 km/h. A wind from the east blows at 69km/h. What is the plane's new velocity with respect to the ground in standard position
Wednesday, March 19, 2014 at 11:02pm

Science (Physics)
456
Wednesday, March 19, 2014 at 10:47pm

physics
Vo = 6.93 m/s[45.6o] Xo = 6.93*cos45.6 = 4.85 m/s Yo = 6,93*sin45.6 = 4.95 m/s. h = (Y^2-Yo^2)/2g = (0-4.95^2)/-19.6 = 1.25 m.
Wednesday, March 19, 2014 at 10:19pm

Physics
During a tennis serve, the ball goes from rest to approximately 32.1 m/s. The average power generated during the serve is equal to 2614 Watts. If the acceleration is constant during the serve, what is the magnitude of the force acting on the ball?(? N)
Wednesday, March 19, 2014 at 10:18pm

physics
A force in the +x-direction with magnitude F(x)=18.0N−(0.530N/m)x is applied to a 7.60kg box that is sitting on the horizontal, frictionless surface of a frozen lake. F(x) is the only horizontal force on the box. If the box is initially at rest at x=0, what is its speed ...
Wednesday, March 19, 2014 at 9:35pm

Physics
V^2 = Vo^2 + 2g*h = 0 at peak. Vo^2 - 19.6*16.6 = 0 Vo^2 = 325.4 Vo = 18.04 m/s = Speed at which ball was kicked.
Wednesday, March 19, 2014 at 9:03pm

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