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April 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
In a control system, an accelerometer consists of a 5.15-g object sliding on a calibrated horizontal rail. A low-mass spring attaches the object to a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the ...
Tuesday, May 7, 2013 at 8:02am

Physics
A rowboat crosses a river with a velocity of 3.37 mi/h at an angle 62.5° north of west relative to the water. The river is 0.590 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?
Tuesday, May 7, 2013 at 8:01am

Physics
A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Tuesday, May 7, 2013 at 7:59am

Physics
A horizontal force of 150 N is used to push a 32.5-kg packing crate a distance of 4.95 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force? (b) the coefficient of kinetic friction between the ...
Tuesday, May 7, 2013 at 7:58am

Physics
A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5,000 J of work in the process. During this time, the car moves 21.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v? (b) the horizontal force exerted on the car?
Tuesday, May 7, 2013 at 7:57am

Physics
Mathlover saale yeh tera home work hai ya brilliant ki website pe teri red maregi
Tuesday, May 7, 2013 at 5:58am

Physics
3.6*10^-3
Tuesday, May 7, 2013 at 5:11am

Physics
31.86
Tuesday, May 7, 2013 at 4:09am

Physics
its wrong tell the right answer please
Tuesday, May 7, 2013 at 2:07am

Physics
Dude tell the right answer I have to show my homework
Tuesday, May 7, 2013 at 2:05am

Physics
wrong wrong wrong dr.cao
Tuesday, May 7, 2013 at 1:37am

Physics
wrong again dr.cao
Tuesday, May 7, 2013 at 1:36am

Physics
Dude Help
Tuesday, May 7, 2013 at 12:43am

Physics
Whats Brilliant Can you tell Me
Tuesday, May 7, 2013 at 12:40am

Physics
wrong
Tuesday, May 7, 2013 at 12:08am

Physics
A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 34.3◦ with the normal, and the refracted ray makes an angle of 18.9◦ with the normal. Find the index of refraction of the ...
Monday, May 6, 2013 at 11:49pm

Physics
wrong,its 54.5
Monday, May 6, 2013 at 11:36pm

Physics
n1sinQ1 = n2sinQ2 for air/glass interface Angle = 27degrees which is sinQ2 n2sinQ2 = n3sinQ3 for glass/water interface
Monday, May 6, 2013 at 11:28pm

Physics
9.90?
Monday, May 6, 2013 at 11:23pm

Physics
try 2?
Monday, May 6, 2013 at 10:23pm

physics
potential energy at horizontal = m g h = m (9.81)(.50-.27) = 2.26 m Joules kinetic energy at vertical = (1/2)I omega^2 I = m (1/12)(1^2) + m (.23)^2 = m (.136) so I omega^2 = .136 m omega^2 omega^2 = 2.26/.136 omega = 4.08 radians/second
Monday, May 6, 2013 at 9:45pm

physics
a = dv/dt = (265-340)/60 = -1.25 rev/sec v = Vi + a t 0 = 265 - 1.25 t t = 212 seconds
Monday, May 6, 2013 at 9:36pm

physics
m g h 8 * .4 = 3.2 meters up 90 * 9.81 * 3.2 Joules
Monday, May 6, 2013 at 9:32pm

Physics Plz help me
5.98x10^6
Monday, May 6, 2013 at 9:17pm

physics
You must be having an identity crisis. You've posted physics questions under four different names in the last few minutes.
Monday, May 6, 2013 at 9:07pm

physics
In a playground there is a small merry-go-round of radius 1.40 m and mass 140 kg. The radius of gyration is 0.960 m. A child of mass 43.0 kg runs at a speed of 3.70 m/s tangent to the rim of the merry-go-round while it is at rest, and then jumps on. Find the angular velocity (...
Monday, May 6, 2013 at 9:04pm

physics
A 16 lb block rests on a horizontal frictionless surface. A cord attached to the block, running horizontally, passes over a pulley whose diameter is 1 in, to a hanging block weighing 16 lb. The system is released from rest, and the blocks are observed to move 7.6 ft in 4 s. ...
Monday, May 6, 2013 at 9:04pm

physics
A solid sphere rolls up an inclined plane of inclination angle 35 degrees. At the bottom of the incline, the center of mass of the sphere has a translational speed of 13 ft/s. How far (in feet) does the sphere roll up the plane (distance along the plane)?
Monday, May 6, 2013 at 9:03pm

physics
A meter stick is suspended vertically at a pivot point 27 cm from the top end. It is rotated on the pivot until it is horizontal and then released from rest. What will be its maximum angular velocity (in radians/second)?
Monday, May 6, 2013 at 9:03pm

physics
While waiting to board a helicopter, you notice that the rotor's motion changed from 340 rev/min to 265 rev/min in one minute. Assuming that this acceleration remains constant, calculate how much longer (in seconds) it will take for the rotor to stop.
Monday, May 6, 2013 at 9:03pm

physics
An automobile traveling 80 mi/hr has wheels 31 inches in diameter. If the car is brought to a stop uniformly in 58 turns of the wheels, what is the magnitude of the angular acceleration of the wheels (in radians/second^2)?
Monday, May 6, 2013 at 9:02pm

physics
A fisherman's scale stretches 2.3 cm. when a 2.5 kg. fish hangs from it. What will be the frequency of vibration if the fish is pulled down and released so that it vibrates up and down?
Monday, May 6, 2013 at 8:33pm

physics
each step of a ladder increases one's vertical height 40.0cm. If a 90 kg painter climbs 8 steps of the ladder, what is the increase in potential energy?
Monday, May 6, 2013 at 8:19pm

physics
each step of a ladder increases one's vertical height 40.0cm. If a 90 kg painter climbs 8 steps of the ladder, what is the increase in potential energy?
Monday, May 6, 2013 at 8:19pm

Physics
I suggest you use the curve of binding energy. You can find it at http://www.chegg.com/homework-help/quest​ions-and-answers/estimate-total-binding-​energy-copper-estimatethe-energy-joules-​needed-break-3-g-copper-pen-q565643 The binding energy of copper, ...
Monday, May 6, 2013 at 8:11pm

Physics
Use the small-amplitude formula: Period = 2*pi*sqrt(L/g) and solve for g. L = 1.29 m Period P = 698/407 = 1.715 seconds g/L = 4*pi^2/P^2 = 13.42 s^-2 g = 17.31 m/s^2
Monday, May 6, 2013 at 8:00pm

physics
Please someone reply to this Question quickly !!
Monday, May 6, 2013 at 7:33pm

physics
Please someone reply to this Question quickly !!
Monday, May 6, 2013 at 7:28pm

Physics
Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.29 m and finds that it makes 407 complete oscillations in 698 s. The amplitude of the oscillations is very small compared to the pendulum’s length. What is the gravitational ...
Monday, May 6, 2013 at 7:22pm

Physics Plz help me
If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you
Monday, May 6, 2013 at 7:18pm

Physics
At an outdoor market, a bunch of bananas is set into oscillatory motion with an amplitude of 30.0781 cm on a spring with a spring constant of 15.7711 N/m. The mass of the bananas is 69.6297 kg. What is the speed of the bananas? Answer in units of m/s
Monday, May 6, 2013 at 7:08pm

Physics
A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. How far did the ball travel before it hit the ground? Round the answer to the nearest meter.
Monday, May 6, 2013 at 7:02pm

Physics
A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. How far did the ball travel before it hit the ground? Round the answer to the nearest meter.
Monday, May 6, 2013 at 7:02pm

Physics
-Estimate the total binding energy for copper? in MeV -Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons? E= in Joulea Please help me I am confused...thanks
Monday, May 6, 2013 at 6:58pm

Physics Plz help me
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
Monday, May 6, 2013 at 6:31pm

Physics
please do help on this one
Monday, May 6, 2013 at 5:58pm

PHYSICS
Draw a picture! Before hitting the bat, the horizontal component of momentum of the ball is px= (.3)(.15)(cos(35)) and the vertical component is py= -(.3)(.15)(sin(35)). Afterwards, the horizontal component of momentum is 0 (it is going straight down) and the vertical ...
Monday, May 6, 2013 at 5:32pm

PHYSICS - still cant get it
Draw a picture! Before hitting the bat, the horizontal component of momentum of the ball is px= (.3)(.15)(cos(35)) and the vertical component is py= -(.3)(.15)(sin(35)). Afterwards, the horizontal component of momentum is 0 (it is going straight down) and the vertical ...
Monday, May 6, 2013 at 5:32pm

physics
constant rotational acceleration
Monday, May 6, 2013 at 4:58pm

Physics
A typical model rocket has a mass of 50 g. Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I instead launched this rocket horizontally, how fast would it be going ...
Monday, May 6, 2013 at 4:54pm

physics practical investigation
Constant variable volume of hcl
Monday, May 6, 2013 at 3:25pm

physics practical investigation
Constant vairable volume of hcl
Monday, May 6, 2013 at 3:25pm

Physics Plz help me
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
Monday, May 6, 2013 at 3:10pm

Physics
can u help me on the RL circuit question 1 and 2?
Monday, May 6, 2013 at 3:05pm

physics
Yo = 250km/h = Ver. component? Vo = 250/sin30 = 500 km/h.
Monday, May 6, 2013 at 2:33pm

Physics
anyone can help me on the RL circuits?
Monday, May 6, 2013 at 2:24pm

physics
Three charges lie along the x-axis. At x = 2.0m, a charge of 15x10^-6 C is fixed. At the origin, a charge of 30x10^-6 is fixed (like in question #8). Where can a third charge be placed between them so it feels no net force?
Monday, May 6, 2013 at 1:54pm

physics
Charged spheres A and B are in fixed positions (like in question #6) and have charges 3.6x10^-6 C and -5.4x10^-6 C respectively. Calculate the net force on sphere C, which has a charge of -9.9x10^-6 C.
Monday, May 6, 2013 at 1:51pm

Physics
Consider the following standing wave, (all units are SI) z=0.2sin(0.4y)cos(350t) (a) The values of t where the displacement at all values of y equals to zero are of the form : t=c+dn, where n=0,±1,±2,3, etc. What is c? What is d?
Monday, May 6, 2013 at 1:07pm

Physics
Consider the series RLC circuit in which R2<4L/C (underdamped). Assume that at t=0 , the charge on the capacitor has its maximum value. The differential equation obeyed by the potential across the capacitor can be written in the following form d2V/dt2+a*dV/dt+b*V=0 In the ...
Monday, May 6, 2013 at 1:04pm

Physics
A roller coaster works by gravitational energy. The coaster car is pulled up to a high point and then released, rolling downwards on the track through all manners of curves and loops. I have a short roller coaster car that I pull up to the top of a hill of height H. The ...
Monday, May 6, 2013 at 12:53pm

Physics
In a series AC circuit, R=20(ohms), Xl=10(ohms), and Xc=25(ohms), where the frequency is 400 Hz. Find the resonant frequency of the circuit.
Monday, May 6, 2013 at 12:25pm

Physics
36.73
Monday, May 6, 2013 at 12:14pm

Physics
problem rider??
Monday, May 6, 2013 at 12:13pm

Physics
No coefficient required..
Monday, May 6, 2013 at 11:22am

college physics
a water skier is being pulled by a tow rope attached to a boat. as the driver pushes the throttle forward,the skier accelerates. a 70.3kg water skier has an initial speed of 6.10m\s. determine the work done by the net external force acting on the skier.
Monday, May 6, 2013 at 11:21am

Physics
can u explain Mc^2,pleasee...
Monday, May 6, 2013 at 11:13am

Physics
Specifically 0.7709 ~ 0.771 And please don't cheat on brilliant ;)
Monday, May 6, 2013 at 10:32am

Physics--please help!!
A student in a parked car honks the horn, which has a `proper' frequency of 320 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 355 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.
Monday, May 6, 2013 at 10:30am

Physics--please help!!
A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16·1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.76·1014 Hz. Calculate the speed at which the galaxy is receding from ...
Monday, May 6, 2013 at 10:29am

physics
calculate the x-component of the reaction force at   ,      , and the axial resultant   at section   ,     , for these four bars in axial loading. Submit your answers in Newtons. (1)    R A x  N incorrect &...
Monday, May 6, 2013 at 10:14am

Physics
Anyone for last question in Problem 1 please?
Monday, May 6, 2013 at 9:54am

physics
Thanks S
Monday, May 6, 2013 at 9:36am

Physics
A steel piano wire, of length 1.0 m and mass 4.4 g is stretched under a tension of 650.0 N. What is the speed of transverse waves on the wire?
Monday, May 6, 2013 at 9:29am

Physics
A steel piano wire, of length 1.0 m and mass 4.4 g is stretched under a tension of 650.0 N. What is the speed of transverse waves on the wire?
Monday, May 6, 2013 at 9:29am

Physics
A transverse wave traveling in a string takes 1.61 s to move 13.2 m. The mass of a 9.2 m piece of the string is 1.5 kg. What is the tension in the string?
Monday, May 6, 2013 at 9:12am

Physics
for problem 1,part 4 (rho_2*g*L^2)/(4*E_1)+(rho_2*g*L^2)/(8*E​_2)
Monday, May 6, 2013 at 8:33am

physics
for problem 1,part 4 (rho_2*g*L^2)/(4*E_1)+(rho_2*g*L^2)/(8*E​_2)
Monday, May 6, 2013 at 8:33am

Physics
I think coefficient of friction shd b given
Monday, May 6, 2013 at 7:58am

physics
a .45 kg ball attached to the end of a horizontal cord is rotated in a circle of radius 1.3 m on a frictionless horizontal surface. if the cord will break when the tension in it exceeds 75N what is the maximum speed the ball can have?
Monday, May 6, 2013 at 7:53am

physics
0.772
Monday, May 6, 2013 at 7:48am

Physics
From a student with an objectionable screenname: Physics - Sm..., Monday, May 6, 2013 at 6:42am Just solve 440/(1 + (340/v)) - 440/(1-(v/340)) = 2
Monday, May 6, 2013 at 7:09am

Physics
a. 2 objects each of mass 200 kg and 500 kg are separated by 50 cm. Where body of mass 20 kg should be placed so that the resultant force of gravity experienced by objects equal to zero? b. launched a rocket leaving Earth. Known radius of the earth 6.4 x 10 ³ km and ...
Monday, May 6, 2013 at 7:03am

physics
ρgh=σ/r r = σ/ ρgh=0.0072/1000•9.8•0.2 = = 3.7•10⁻⁵ m= 37μm
Monday, May 6, 2013 at 5:43am

physics
A typical science question young people have is "Why can a glass can contain water?" and a typical answer is "Because the distance between molecules that make up the glass is smaller than the size of each water molecule." This isn't quite right though. ...
Monday, May 6, 2013 at 4:48am

physics
You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a frequency of 2 Hz. How ...
Monday, May 6, 2013 at 4:47am

physics
A motorbike starts from rest at time t=0 and begins to accelerate around a circular track as shown in the figure below. Eventually, at time t=t_1 the motorbike reaches the maximum velocity possible without slipping off the track. What's the minimum length in meters the ...
Monday, May 6, 2013 at 4:47am

physics
a ball is dropped from a point heiht above the ground.on striking the ball it rebounds with a small speed as it strikes with the ground and would hence come up to same height from were it was dropped and motion remained infinetly?draw x-t gaphs?
Monday, May 6, 2013 at 4:42am

Physics
am not getting these answers marked correct ! plz if u can check it again ! thnx :)
Monday, May 6, 2013 at 2:24am

Physics
Power = (voltage)*(current) = 33*10^6 V * 79*10^-3 A = 2.6*10^6 W = 2.6 Megawatts
Monday, May 6, 2013 at 1:51am

Physics
(water density)*g*(max straw vertical length) = 1 atm. = 101,325 Pa. Solve for max straw length Hmax = 101,325/(9.8*1000 kg/m^3) = 10.3 m
Monday, May 6, 2013 at 1:42am

Physics
A motorbike starts from rest at time t=0 and begins to accelerate around a circular track as shown in the figure below. Eventually, at time t=t1 the motorbike reaches the maximum velocity possible without slipping off the track. What's the minimum length in meters the ...
Monday, May 6, 2013 at 12:21am

Physics
Details and assumptions The speed of sound is 340 m/s. The trumpet players aren't moving very fast.
Monday, May 6, 2013 at 12:20am

Physics
Consider a glass with full of water of mass density ρ=1,000 kg/m3 and height h=20 cm. There's a circular hole in the bottom of the glass of radius r. The maximum pressure that pushes the water back into the hole is roughly (on the order of) p=σ/r, where σ=0....
Monday, May 6, 2013 at 12:19am

Physics
You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a frequency of 2 Hz. How ...
Monday, May 6, 2013 at 12:18am

Physics
I drink from a glass of water with a vertical straw. What's the longest straw I can use and still drink water if the ambient pressure is 1 atm? Give your answer in meters. Details and assumptions 1 atm is 101,325 Pa. The acceleration of gravity is −9.8 m/s2. The ...
Monday, May 6, 2013 at 12:18am

Physics
In the following circuit R_1=3 Ohm, R_2=10 Ohm, C=0.003 Farad, V=5 Volts. At time t =0 we connect the power supply to the circuit. At t=0 the capacitor is uncharged. (a) What is the time constant tau (in seconds) to charge up the capacitor? (b) What is the electric potential ...
Monday, May 6, 2013 at 12:16am

Physics
a horizontal force Pushes a 80 N box up a frictionless 37 degree incline at a constant velocity as shown.? What is the magnitude of P in newtons?
Sunday, May 5, 2013 at 11:41pm

physics
physics
Sunday, May 5, 2013 at 10:25pm

physics
A spring loaded gun is used to shoot a 1.3 kg ball from a rooftop. When the gun is fired, a compressed spring will be released shooting the ball into the air. The ball will travel in a parabolic path eventually striking the ground below. The gun is at an angle of 39° above...
Sunday, May 5, 2013 at 10:22pm

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