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April 23, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics please help?????
The figure shows three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; ...
Wednesday, April 16, 2014 at 7:35am

national academy physics
a circular track is made on which an athlete has to cover three rounds to complete a 1000m run.during the run find the distance and magnitude of displacement of the athlete
Wednesday, April 16, 2014 at 7:21am

Physics
Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?
Wednesday, April 16, 2014 at 4:32am

Physics
An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
Wednesday, April 16, 2014 at 4:31am

physics
An object floats on water with 84% of its volume below the surface. The same object when placed in another liquid floats on that liquid with 74% of its volume below the surface. Determine the density of the unknown fluid
Wednesday, April 16, 2014 at 2:41am

Math/Physics
Why the 1/2 in 1/2*a*time^2?
Wednesday, April 16, 2014 at 1:22am

Math/Physics
John distance=20*time Jane distance=15*time+1/2 a time^2 set them equal, solve for time then solve for either distance in that time.
Wednesday, April 16, 2014 at 12:20am

Math/Physics
John is driving at a constant speed of 20.0 m/s when he passes Jane, who is traveling in the same direction at 15.0 m/s at the moment that John passes her. If Jane is accelerating at 2.0 m/s2, how far will Jane drive before she catches up to John? How much time passes from ...
Tuesday, April 15, 2014 at 11:13pm

Physics
fdsafsdafdas
Tuesday, April 15, 2014 at 10:35pm

physics
4
Tuesday, April 15, 2014 at 10:09pm

physics
k
Tuesday, April 15, 2014 at 9:12pm

Physics
A crate begins sliding down a frictionless incline of 25.0o. If the objects begins sliding from rest and takes 1.50 sec to slide down the incline, what is the speed of the crate as it leaves the incline? How long is the incline?
Tuesday, April 15, 2014 at 7:54pm

Physics
John is driving at a constant speed of 20.0 m/s when he passes Jane, who is traveling in the same direction at 15.0 m/s at the moment that John passes her. If Jane is accelerating at 2.0 m/s2, how far will Jane drive before she catches up to John? How much time passes from ...
Tuesday, April 15, 2014 at 7:54pm

Physics
0 idk
Tuesday, April 15, 2014 at 7:24pm

Physics
ignoring air friction, the acceleration of the ball is due to gravity, always pointed downward.
Tuesday, April 15, 2014 at 6:56pm

physics
A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s. distance=time*speedsound solve for distance. Then, well depth is one half distance.
Tuesday, April 15, 2014 at 5:48pm

Physics
C(-1.5,0.5), P(x,y) r^2 = (x+1.5)^2 + (y-0.5)^2 = 3^2 x^2+3x+2.25 + y^2-y+0.25 = 9 x^2+3x + y^2-y = 9-2.25-0.25 = 6.5 x^2+3x=(3/2)^2 + y^2-y+(-1/2)^2 = 6.5 x^2+3x+9/4 + y^2-y+1/4 = 26/4+9/4+1/4 x^2+3x+9/4 + Y^2-y+1/4 = 36/4 Multiply both sides by 4: 4x^2+12x+9 + 4y^2-4y+1 = 36...
Tuesday, April 15, 2014 at 5:46pm

college physics
A reflecting telescope has a radius of curvature of 3m for its objective mirror and a radius of curvature of -1.5 for its eyepiece mirror. If the distance between the two mirrors is 0.90 m, how far in front of the eyepiece should you place the electronic sensor to record the ...
Tuesday, April 15, 2014 at 4:06pm

Physics
The figure shows three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; ...
Tuesday, April 15, 2014 at 4:06pm

physics
A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s.
Tuesday, April 15, 2014 at 4:01pm

physics
This is a most flawed problem. Perhaps the author has a different understanding of friction than I.
Tuesday, April 15, 2014 at 1:59pm

physics
jabu phuses a cart that is of mass 5kg with a speed of 1m,s she suddenly increase the force acting on the cart to move 2m,s for a distance of 50m (a)calculate the force causing the cart to speed up
Tuesday, April 15, 2014 at 1:29pm

physics
What will the angle of refraction be for a ray of light passing from air into a sodium chloride crystal if the angle of incidence is 60.0°? The index of refraction of sodium chloride is 1.53.
Tuesday, April 15, 2014 at 1:20pm

Physics
A ball is kicked and flies from point P to Q following a parabolic path in which the highest point reached is T. The acceleration of the ball is
Tuesday, April 15, 2014 at 12:40pm

Physics
Man stands out on the street with a frequency meter. A police car drives by with the sirens on and the frequency of the sounds measures 800 Hz when it get close but 600 Hz when the car goes away. a) What is the speed of the police car? b) What is the actual frequency of the ...
Tuesday, April 15, 2014 at 8:29am

physics
Propeller blade in aeroplane is 2m long if propeller rotates 1800rev/min compute tangential velocity.
Tuesday, April 15, 2014 at 6:07am

statistics
z-score for chemistry = (82-75)/6.25 = 1.12 z-score for physics = (63-59)/3.57 = 1.12044 I would consider the difference insignificant, so the two scores would be equivalent.
Monday, April 14, 2014 at 11:00pm

statistics
Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...
Monday, April 14, 2014 at 10:27pm

Physics
Vo = 210m/s[70o] Xo = 210*cos70 = 71.82 m/s. Yo = 210*sin70 = 197.3 m/s. 1. h = (Y^2-Yo^2)/2g=(0-197.3^2)/-19.6 = 1986 m.
Monday, April 14, 2014 at 10:20pm

Physics
A "reference ring" with moment of inertia Ic rests on a solid disk torsion pendulum with a moment of inertia I0. a) What is the period T0 for the motion with the disk alone? b) What is the period T1 for motion with the combined system? c) Use the expressions from a) ...
Monday, April 14, 2014 at 9:22pm

physics
Henry, you didnt account for the vertical pull of the boy. therefore friction is less than 18.8.
Monday, April 14, 2014 at 8:33pm

Physics
The graph below shows the force applied to a 4.0 kg cart initially at rest but free to move on a horizontal track. Forces (in N) are measured on the ordinate and times (in s) are measured on the abscissa. Use the following values for the graph: a = 4.9 and x = 2.0. Assume the ...
Monday, April 14, 2014 at 8:22pm

physics
d = 0.5a*t^2 = 6 m. 0.5a*3.3^2 = 6 5.445a = 6 a = 1.102 m/s^2. V^2 = Vo^2 + 2a*d = 0 + 2.204*6 = 13.22 V = 3.64 m/s.
Monday, April 14, 2014 at 8:14pm

PHYSICS
The image is 4.4 m from the dog. b. rate relative to the dog, or surroundings? Relative to the dog, .56m/s, relative to wall, .28m/s
Monday, April 14, 2014 at 6:48pm

PHYSICS
A dog sitting 2.2m from a vertical mirror thinks its image is another dog. A)How far is the image from the dog? B)To investigate, the dog walks directly toward the mirror at 0.28m/s . At what rate does the dog approach its image?
Monday, April 14, 2014 at 6:19pm

PHYSICS
A laser is mounted on a table 1.04m above the ground, pointed at a vertical mirror a horizontal distance 3.46m away. The laser beam strikes the mirror 1.52m above the ground. Behind the laser is a wall, 2.80m from the aperture where the laser light emerges. At what height does...
Monday, April 14, 2014 at 6:18pm

Physics
11 s
Monday, April 14, 2014 at 6:00pm

physics
but what is the tension of the wire
Monday, April 14, 2014 at 5:52pm

physics
massdeficit=energy/speedlight convert MeV to joules first.
Monday, April 14, 2014 at 5:42pm

physics
I will be happy to critique your thinking. Giving you the answers is less appealing to me.
Monday, April 14, 2014 at 5:41pm

physics
YOu are given mass/length. You are given half wavlength length of 6.9m, and 20 m. wire 1 has a third harmonic wavelength of 30 m. First overtone of wire2 has a wavlength of 2*6.9m
Monday, April 14, 2014 at 5:36pm

physics
that is what i thought
Monday, April 14, 2014 at 5:34pm

physics
It is not reasonable to assume conservation of energy. There is not enough information to do this without the conservation of energy.
Monday, April 14, 2014 at 5:31pm

physics
A 15.4g bullet traveling at 270 m/s is fired into a 0.488kg wooden block anchored to a 100 N/m spring. How far is the spring compressed? x_{compressed} = If the speed of the bullet is not known but it is observed that the spring is compressed 43.9 cm, what was the speed of ...
Monday, April 14, 2014 at 5:28pm

physics
Two wires are anchored at both ends. Wire 1 has a mass of 105 grams and a length of 6.9 m. Wire 2 has a mass of 60 grams, a length of 20 m, and a tension of 143 N. What must be the tension in Wire 1 if its third harmonic is to equal the first overtone of Wire 2? T_{wire1} =
Monday, April 14, 2014 at 5:20pm

physics
The velocity of a simple harmonic oscillator is given by; v = + 6.92*sin(10.5*t) (mks units) What is its angular frequency? omega = What is the amplitude of the motion? A = Where is the mass at the time t = 86.08 seconds? x = If the mass is 0.53 kg, what is the spring's ...
Monday, April 14, 2014 at 5:02pm

physics
the binding energy of a nucleus is 240.0 MeV. What is the mass defect of the nucleus in atomic mass units?
Monday, April 14, 2014 at 4:29pm

physics
V=110km/h = 110,000m/3600s = 30.56 m/s. a=(V-Vo)/t = (30.56-0)/0.005=6111 m/s^2. F = m*a = 0.35 * 6111 = 2139 N.
Monday, April 14, 2014 at 4:29pm

Physics
An object is 14 cm in front of a diverging lens that has a focal length of -7.9 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.9?
Monday, April 14, 2014 at 4:26pm

physics
a = (V-Vo)/t = (30-0)/4 = 7.5 m/s^2.
Monday, April 14, 2014 at 4:16pm

Physics
Magnification=f/f-do m=6/6-2 m=1.5
Monday, April 14, 2014 at 4:02pm

Physics
A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?
Monday, April 14, 2014 at 3:56pm

physics
d = 53 + 53/5 = 63.6 m. T = d/r = 63.6/5 = 12.72 s.
Monday, April 14, 2014 at 3:40pm

Physics
If the detector (radar)is at rest and the source (moving car that reflects the sound)) is moving away from the detector, the observed frequency f is less than the actual frequency f₀. The speed of sound v =343 m/s f=f₀v/(v+V) V=v(f₀-f)/f =343•(1.5-1.4)&#...
Monday, April 14, 2014 at 2:58pm

Physics
ok, thank you for explaining
Monday, April 14, 2014 at 2:45pm

Physics
v = d/t d = v*t d = 20m/s 5 waves Answer = 20meters/5
Monday, April 14, 2014 at 2:29pm

Physics
how did you get 4m?
Monday, April 14, 2014 at 2:23pm

Physics
4m
Monday, April 14, 2014 at 2:02pm

physics
KE=mv²/2 v²= 2•KE/m a= v²/2s F=ma=mv²/2s= 2m•KE/2s m= = KE/s=10/0.005 =2000 N
Monday, April 14, 2014 at 1:56pm

Physics
Thank you so much
Monday, April 14, 2014 at 1:52pm

Physics
Last question i'm stuck on please help me through this. Five waves pass a dock in 2.0 s. If the waves are traveling at 10.0 m/s, then what is the wavelength of the waves?
Monday, April 14, 2014 at 1:50pm

Physics
thank you so much :D, you really helped me out
Monday, April 14, 2014 at 1:49pm

Physics
The speed of sound at 20°C v=343 m/s s=vt=343•3=1029 m
Monday, April 14, 2014 at 1:40pm

Physics
(i) h=gt²/2 t=sqrt(2h/g)=sqrt(2•10000/9.8)=45.2​ s. (ii) v=800000/3600 = 222.2 m/s s=vt =222.2•45.2 =10044 m (iii) x=0 (since the horizontal speed of the cargo is constant)
Monday, April 14, 2014 at 1:34pm

Physics
A cue ball collides with two other snooker balls and comes to a complete stop. The angles between the centres at the point of collision are shown below. If the velocity of the incoming cue ball is 5 m/s, determine the velocities of all moving balls after the collision.
Monday, April 14, 2014 at 1:32pm

Physics
A cargo plane is flying horizontally at an altitude of 10000m with a velocity of 800km/h when a cargo pallet falls out the back ramp. (i) How long does it take to fall to the ground? (ii) How far horizontally is the pallet from where it fell off when it hits the ground? (iii) ...
Monday, April 14, 2014 at 1:25pm

Physics (ASAP)
lol
Monday, April 14, 2014 at 1:10pm

physics
Four identical masses of mass 800kg each are placed at the corners of a square whose side lengths are 15.0cm . What is the magnitude of the net gravitational force on one of the masses, due to the other three?
Monday, April 14, 2014 at 12:38pm

Physics
Help me please I'm stuck on this question 2.In a thunderstorm at 20.0°C, Karen sees a bolt of lightning and hears the thunderclap 3.00 s later. How far from Karen did the lightning strike? Show your work.
Monday, April 14, 2014 at 12:33pm

Physics
A radar sends out a sound wave of 1.50 Mhz and senses it again from a moving car at a 1.40 Mhz. What is the speed of the car ?
Monday, April 14, 2014 at 8:17am

physics
A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?
Monday, April 14, 2014 at 4:26am

Physics
An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
Monday, April 14, 2014 at 3:24am

Physics
Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?
Monday, April 14, 2014 at 3:21am

physics
1. A car travels down a straight, flat, level road. Initially, the car is traveling at 80.0 km/hr Northward . After traveling 0.50 0 km , the car is traveling at 95 .0 km/hr. What is the magn i tude of the car ’ s acceleration during this interval ?
Monday, April 14, 2014 at 1:09am

physics
The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right edge, and the force ...
Monday, April 14, 2014 at 12:56am

physics
In I2 you halfed the radius of the flat disk as if it were a diameter like pottery wheel. it's not 0.065 it's 0.13
Sunday, April 13, 2014 at 10:57pm

physics 1
A person is sitting with one leg outstretched and stationary, so that it makes an angle of 30.0° with the horizontal, as the drawing indicates. The weight of the leg below the knee is 50.5 N, with the center of gravity located below the knee joint. The leg is being held in...
Sunday, April 13, 2014 at 9:43pm

physics
A small object is attached to the end of a horizontal spring at position x = 0. It is the pulled to position x = A and released. In one full cycle of its motion, the total distance traveled by the object is...
Sunday, April 13, 2014 at 8:58pm

Physics
32522J
Sunday, April 13, 2014 at 8:08pm

physics
you're not following the sig fig rule- it's -110 because you can only have 2 significant figures.
Sunday, April 13, 2014 at 7:17pm

Physics
Shrek is Love Shrek is Life
Sunday, April 13, 2014 at 6:26pm

Physics
weight of ladder = m g = W force down on floor = W max friction force = .3 W so horizontal force on top of ladder from wall = . W Take moments about base of ladder .3 W (L sin T) = W(L/2)cos T .3 sin T = (1/2) cos T tan T = .5/.3 T = 59 degrees Notice that the ladder length ...
Sunday, April 13, 2014 at 3:03pm

Physics
Can someone help with the following physics problem? This is the only one I'm having trouble solving. Thanks. A 3.6-m-long ladder leans against a frictionless wall as shown in the figure below. The coefficient of static friction between the ladder and the floor is 0.30. ...
Sunday, April 13, 2014 at 12:30pm

physics
An outfielder throws a 1.65 kg baseball at a speed of 59 m/s and an initial angle of 14.2◦. What is the kinetic energy of the ball at the highest point of its motion?
Sunday, April 13, 2014 at 11:32am

Health Physics
1. Two blocks of mass 0.1 kg and 0.2 kg approach each other on a frictionless surface at velocities of 0.4 and 1 m/s respectively. If the blocks collide and remain together, calculate their joint velocity after the collision. 2. A cyclotron produces a 100-μA beam...
Sunday, April 13, 2014 at 11:18am

Quantum Physics
if you still have the answers it would be extremely helpful to post them!
Sunday, April 13, 2014 at 9:38am

Physics
nfttttttfg
Sunday, April 13, 2014 at 8:46am

physics grade 10 icse
v is the same forces in ration 1:2
Sunday, April 13, 2014 at 6:37am

Physics
Side note: Since Olaf wasn't moving initially, molaf*Vi2 = 0
Sunday, April 13, 2014 at 2:30am

physics
4
Sunday, April 13, 2014 at 1:21am

physics grade 10 icse
two balls of masses in ratio 1:2 are dropped from the same height find : a. the ratio between their velocities when they strike the ground and b. the ratio of the forces acting on them during motion
Sunday, April 13, 2014 at 12:21am

Physics 141
A 71-kg skier is going down a slope oriented 37° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
Saturday, April 12, 2014 at 11:52pm

Physics
Which of the following is the equation of the circle with centre (-1.5, 0.5) and radius 3? A. 2x^2 + 6x + 2y^2 - 2y - 13 = 0 B. 2x^2 - 6x + 2y^2 + 2y - 13 = 0 C. 2x^2 - 6x + 2y^2 - 2y - 13 = 0 D. 2x^2 + 6x + 2y^2 - 2y - 23 = 0 E. @x^2 + 6x + 2y^2 - 2y -14 = 0
Saturday, April 12, 2014 at 11:45pm

Physics
If the ball hits Olaf and bounces off his chest horizontally at 8.10m/s in the opposite direction, what is his speed vf after the collision? Ans. mball*Vi1+molaf*Vi2=mball*Vf1+molaf*Vf2 Solve for Vf2 ( you have all the other variables given)
Saturday, April 12, 2014 at 10:00pm

physics
Use either Biot Savart Law, or Amperes law: the magnetic field is related to the current enclosed....
Saturday, April 12, 2014 at 3:55pm

Physics
If air resistance is neglible, the total mechanical energy of a free-falling body will be A remains constant B becomes zero C increases D decreases
Saturday, April 12, 2014 at 3:42pm

Physics
the sum the heats gained is zero. heat1+heat2=0 5*c*(Tf-10)+1*c*(tf-40)=0 c divides out, solve for Tf tf(5+1)=50+40 tf= 90/6=15C
Saturday, April 12, 2014 at 3:34pm

Physics
on each nail? 75*g/10,000mm^2 want it in N/m^2? 75g/10,000mm^2 * (1mm/.001m)^2
Saturday, April 12, 2014 at 3:26pm

Physics
A man of mass 75 kg lies on a bed of 10,000 nails. The tip of each nail has an area of 1.0 square millimeter. What pressure does the man experience? [g=10 N/kg]
Saturday, April 12, 2014 at 3:04pm

Physics
5.00 kg of some liquid at 10.0 oC is mixed with 1.00 kg of the same liquid at 40.0 oC. what is the final equilibrium temperature? ignore any heat flow with the containers and/or surroundings
Saturday, April 12, 2014 at 1:44pm

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