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August 22, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
a 68kg skier is speeding down a ski slope that makes a 32 angle with the horizontal. The co-efficient of friction between the skies and the snow is 0.05. What is the acceleration of the skier? I want to understand how to do this
Wednesday, July 30, 2014 at 1:54am

Physics
A 3.0g bead has been threaded onto a vertical, frictionless, circular hoop with a 20cm radius. The bead is released from rest at 25º below the vertical. (a) Find the speed of the bead when it is 70° below the vertical. (b) Using the free-body diagram technique, find ...
Wednesday, July 30, 2014 at 12:36am

physics
A small rock passes a massive star, following the path shown in red on the diagram above. When the rock is a distance 4e+13 m (indicated as d1 on the diagram) from the center of the star, the magnitude of its momentum p1 is 1.1e+17 kg ·m/s, and the angle α is 116 ...
Tuesday, July 29, 2014 at 8:45pm

physics
A 900kg car strikes a huge spring at a speed of 22m/s, compressing the spring 4.0m How long is the car in contact with the spring before it bounces off in the opposite direction? I found the spring constant to be 27225, which i know is right, but am having trouble with this ...
Tuesday, July 29, 2014 at 4:27pm

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above
Tuesday, July 29, 2014 at 2:20pm

Physics
Why should a voltmeter have a hisg resistance? How should a voltmeter be connected to the componenets of which the voltage is being measured.
Tuesday, July 29, 2014 at 2:17pm

Physics -- check answer please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
Tuesday, July 29, 2014 at 1:50pm

PHYSICS
WHAT DOES A DISPLACEMENT-TIME BALLON GRAPH REPRESENTS?
Tuesday, July 29, 2014 at 7:58am

Physics
The maximum torque output from the engine of a new experimental car of mass m is τ. The maximum rotational speed of the engine is ω. The engine is designed to provide a constant power output P. The engine is connected to the wheels via a perfect transmission that can...
Monday, July 28, 2014 at 11:02pm

Physics -- check answers please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
Monday, July 28, 2014 at 10:23pm

physics
1. If the period of a wave is 0.27s, how many waves would pass by in 1.0 minute? 2. When a wave from of light passes through an opening that's large compared to its wavelength, it: a) behaves as a single new point source b) produces a straight wave front, curved backwards ...
Monday, July 28, 2014 at 9:44pm

Physics -- check answer please
Refraction is: a) the way light behaves when it goes through a narrow opening b)the way teo light sources interact to produce interference patterns c) the absorption of one component of the electric field d) none of the above are correct my answer: d
Monday, July 28, 2014 at 9:42pm

PHYSICS
You are driving your car and the traffic light ahead turns red. You applied the brake for 3.00 seconds and the velocity of the car decreases to 4.50 m/s. The car's deceleration has a magnitude of 2.70 m/s^2 during this time. What is the car's displacement?
Monday, July 28, 2014 at 9:34pm

College Physics 2
A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. (B) What would be the frequency of a station for which the carrier wave was 400 m long?
Monday, July 28, 2014 at 7:12pm

Physics -- check answers please
1. If 31 waves pass by a point in 1.7 s, what's the frequency? my answer: 18.2 Hz 2. if a crest with an amplitude of 7cm interferes with a trough with an amplitude of 10 cm, the resulting wave has an amplitude of: my answer: -3
Monday, July 28, 2014 at 6:04pm

Physics 2
In order of increasing frequency, list the waves that make up the electromagnetic spectrum and give an example of each type of wave. Explain how Snell’s law describes refraction.
Monday, July 28, 2014 at 5:22pm

Physics 2
Explain briefly the workings of electrical transformer, both step-up and step-down In a step-up transformer, compare the secondary voltage and current to the corresponding primary values. Explain briefly how transformers minimize losses in long distance electrical circuits. ...
Monday, July 28, 2014 at 5:21pm

Physics 2
State Lenz’s law and explain Briefly explain the operation of an electric generator
Monday, July 28, 2014 at 5:20pm

Physics 2
List and explain briefly five magnetic devices found in the popular culture Are stationary charges affected be a magnetic field? What determines the direction of the magnetic force on a moving charge? What is the cause of all magnetic fields?
Monday, July 28, 2014 at 5:20pm

Physics 2
A 60 cm long wire is oriented from east to west directly above the equator and carries a current of 5 A (toward the east). What is the magnitude and direction of the magnetic force on this wire due to the earth’s magnetic field (30 µT oriented south and north)?
Monday, July 28, 2014 at 5:14pm

Physics 2
what magnetic force would an electron experience due to Earth’s magnetic field if it were moving at 3x10E6 m/s directly away from earth’s surface? (Earth’s B-field in the region is parallel to the surface and has a strength of 550 µT)
Monday, July 28, 2014 at 5:13pm

Physics 2
A 42 mT magnetic field points due west. If a proton of kinetic energy 9x10E-12 J enters this field in an upward direction, find the magnetic force acting on the proton in magnitude and direction.
Monday, July 28, 2014 at 5:13pm

physics
An object carries a charge of -6.9 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the same charge?
Monday, July 28, 2014 at 3:32pm

physics
Two spherical objects are separated by a distance of 1.53 × 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each ...
Monday, July 28, 2014 at 2:19pm

physics
A proton moves parallel to an electric field between points A and B. The change in the proton's electric potential energy is EPEB – EPEA. If the proton is removed from point B and replaced with an electron, how does the change in electric potential energy of the ...
Monday, July 28, 2014 at 2:04pm

Physics
Two objects separated by a distance r are each carrying a charge –q. The magnitude of the force exerted on the second object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the magnitude of the ...
Monday, July 28, 2014 at 1:39pm

physics
a car is moving foward at 15.7m/s. a person in the bus throws a ball horizontally toward the front of the car at 17.5 m/s from your perspective as an observer outside the car the tennis ball appears to moving at what velocity?
Monday, July 28, 2014 at 9:58am

physics
a jeepney of a mass 1500kg is travelling at a speed of 20m/s (about 70km/h) a. what is the kinetic energy of the jeepney? b.suppose the driver suddenly steps on the brakes. if the force is 7500 newtons, what will be the distance traveled by the jeepney before it stops?
Monday, July 28, 2014 at 7:00am

physics
A girl pushes up an incline fives times longer than a man who lifts the same block the same height. How much more force does the man exert on the block?
Sunday, July 27, 2014 at 11:47pm

physics
how long does it take an car travailing in the left lane of a highway at 60km/h to overtake another car in the right lane traveling at 40km/hr when the cars start 100meters apart
Sunday, July 27, 2014 at 11:29pm

Physics
You are standing on a fish pond wishing to catch a fish. How would you aim your fish gun in order to catch a fish which your eyes could see 20 cm below the surface of water ? will u aim higher , lower or exactly on the location of the fish as seen by your eyes ? find out what ...
Sunday, July 27, 2014 at 10:48pm

physics
Red light with a wavelength of 660 nm and blue light with a wavelength of 480 nm are beamed at a double slit with a separation of 2x10^-3 mm. The third order maximums for the different colours occur at different spots. What is the angle between the second order maximums?
Sunday, July 27, 2014 at 9:47pm

Physics 2
1.) The microwave protion of the spectrum has wavelengths ranging from 1 mm to 1 m. find the corresponding frequency? 2.) An AM radio station has a wavelength of 300 m. find this station’s frequency? 3.) A) Canadian FM radio station (CLAW) broadcasts lobster information ...
Sunday, July 27, 2014 at 2:31pm

Physics 2
A 6 cm high object is placed 43ncm from a converging lens of focal length 24 cm. Find the image’s position and draw a ray diagram approximately to scale.
Sunday, July 27, 2014 at 2:28pm

Physics 2
if the average speed of light in a medium is 2.2x10E8 m/s, what is the medium’s index of refraction?
Sunday, July 27, 2014 at 2:26pm

Physics 2
the microwave protion of the spectrum has wavelengths ranging from 1 mm to 1 m. find the corresponding frequency?
Sunday, July 27, 2014 at 2:26pm

Physics 2
An AM radio station has a wavelength of 300 m. find this station’s frequency?
Sunday, July 27, 2014 at 2:26pm

Physics 2
A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. (B) What would be the frequency of a station for which the carrier wave was 400 m long?
Sunday, July 27, 2014 at 2:25pm

physics
The function of those little black transformers that clog your power strips is to step down line voltage to run small electronic gadgets. Suppose a fax machine uses an ideal transformer with a primary voltage of 120 V and primary windings. If the secondary voltage is 12 V find...
Sunday, July 27, 2014 at 1:20pm

physics
A 42 mT magnetic field points due west. If a proton of kinetic energy 9x10E-12 J enters this field in an upward direction, find the magnetic force acting on the proton in magnitude and direction. What magnetic force would an electron experience due to Earth’s magnetic ...
Sunday, July 27, 2014 at 1:19pm

physics
An ice cube at 0°C measures 14.1 cm on a side. It sits on top of a copper block with a square cross section 14.1 cm on a side and a length of 18.9 cm. The block is partially immersed in a large pool of water at 89.3°C. How long does it take the ice cube to melt? Assume...
Sunday, July 27, 2014 at 12:38pm

Physics
why does the temperature of boiling water remain the same as long as the heating and boiling continue?
Sunday, July 27, 2014 at 12:08pm

physics
WHICH HAS PRINCIPAL QUANTUM NUMBER OF 3 AND ANGULAR MOMENTUM QUANTUM NUMBER OF 2 A 3s b 3d c 4f d 3f
Sunday, July 27, 2014 at 11:47am

physics
charge on 500mg of electron
Sunday, July 27, 2014 at 11:35am

physics
Why does a conductor carrying current experiences force when held in a magnetic field at right angles to it?
Sunday, July 27, 2014 at 10:58am

physics
A straight copper conductor is held parallel to the axis of a freely suspended magnetic needle such that the conductor is under the needle and the current is flowing from south to north. In which direction the north of magnetic needle will move?
Sunday, July 27, 2014 at 10:58am

physics
Fill in blank: Two slits can produce an interference pattern with visible light but this maximal point of constructive interference can be made more pronounced by using many fine lines in a __________
Sunday, July 27, 2014 at 7:49am

physics
Fill in blank Increasing the distance between a pair of slits through which light is being shone would ___ the distance between nodal lines appearing on a screen
Sunday, July 27, 2014 at 7:48am

physics
When a pencil cell is released from a certain point on a inclined board,it travels a distance of 35cm on floor A before it comes to rest.when the same pencil cell is released from the same point on the same inclined board,it travels a distance of 20 cm on floor B before coming...
Sunday, July 27, 2014 at 7:11am

physics
19. A ball with a mass of 2 kg moves to the right at a speed of 0.28 m/s. It hits a ball of mass 0.5 kg which is at rest. After collision, the second ball moves to the right with a speed of 1.5 m/s. What is the speed and direction of the first ball after collision?
Sunday, July 27, 2014 at 5:48am

physics
A cart being pulled by a 10 year old Boy with a force that is parallel to the surface. if the surface is inclined at 50° and the cart is 250kg while the surface has a coefficient of friction of 0.22 find the Normal force, Force of Friction and Force exerted by the boy
Sunday, July 27, 2014 at 2:49am

Physics
I am to fill in the blanks without a word bank, my answers are in brackets. 1. When light waves reflect from media in which the speed of light is slower, their phase (crest or trough) is ____ 2. The trick to being able to observe interference patterns for light waves in to ...
Saturday, July 26, 2014 at 5:34pm

Physics -- check answers please
I am to fill in the blanks without a word bank, my answers are in brackets. 1. A ____ diffraction pattern is unique because it has a larger central maximum. (single slit) 2. the brightest, clearest diffraction pattern is created with a _____ (barrier)
Saturday, July 26, 2014 at 2:51pm

physics
A jumper of mass m=55 kg starts in a crouched position with the jumper's center of mass at a position y1=0 m. Just before the jumper leaves the floor, his or her center of mass is at y2=0.7 m. From another measurement, you have found that the velocity of the jumper's ...
Saturday, July 26, 2014 at 1:17pm

physics
A maass of 0.5kg is attached to one end of the helical spring and produces an extension 2.5cm the mass now set into vertical oscillation of amplitude 10mm the period of oscillation is??....g=10ms2
Saturday, July 26, 2014 at 8:19am

PHYSICS
A conductor of length 0.5m moves in a uniform magnetic field of flux density 2 wbm^2. at a uniform velocity of 40m/s. Calculate the induced EMF under the following conditions: (1) the conductor moves at right angle to the magnetic field (2) the conductor moves at an angle of ...
Saturday, July 26, 2014 at 7:31am

physics
A butterfly is flying with velocity 10i +12jˆ m/s and wind is blowing along x axis with velocity u. If butterfly starts motion from A and after some time reaches point B, find the value of u. Answer this Question
Saturday, July 26, 2014 at 3:44am

Physics
A butterfly is flying with velocity jˆ i 12 ˆ 10 + m/s and wind is blowing along x axis with velocity u. If butterfly starts motion from A and after some time reaches point B, find the value of u.
Saturday, July 26, 2014 at 3:35am

physics
a baseball is thrown from a mound .833ft above ground level ,to home plat 60.5 feet away. the ball is released horizontally from the pitcher with a velocity of 139ft/s when the pitchers hand is 5.3ft above the mound. a)how long will it take to reach home plate? b) how far did ...
Friday, July 25, 2014 at 3:00pm

Physics
The following figure represents the ride for a cart with a mass of 200 kg along a frictionless track. a. Calculate the velocity of the cart at points A, B, and C if the cart is dropped from a height of 100m with a initial velocity of 10 m/s. b. Calculate the height of the ...
Friday, July 25, 2014 at 2:27pm

physics
a man throws his keys up to his wife 4.00m above. the wife catches the keys 1.50s later. with what initial velocity were the keys thrown?
Friday, July 25, 2014 at 11:36am

physics
a roller coaster weighing 500kg starts at rest from a point of 45m above the ground. what is its speed when it reaches point b at ground level?
Friday, July 25, 2014 at 10:52am

physics
thank you
Friday, July 25, 2014 at 9:13am

physics
so mr.pursley the velocity doesn't matter for the question I asked?
Friday, July 25, 2014 at 9:10am

physics
so the velocity doesn't matter for the question I
Friday, July 25, 2014 at 9:06am

physics
what would the tension in a string be if the block being suspended by the string had a mass of 5.0kg the acceleration was 2.2m/s^2 and the velocity was 5.2m/s
Friday, July 25, 2014 at 8:47am

physics
can we make any science model on application of ultrasound
Friday, July 25, 2014 at 7:59am

Physics
A small charged sphere,A, carries 4 times the charge of another sphere B. When these are placed 4.5 cm apart, they experience a force of 0.016N attraction between them. Find the charge on B.
Thursday, July 24, 2014 at 10:28pm

Physics
The light ray strikes the hypotenuse of the prism at an angle of incidence greater than the critical angle. Find the angle phi of the ray as it leaves the base of the prism. The incident ray is perpendicular to the left side of the prism. (The index of refraction of the prism ...
Thursday, July 24, 2014 at 2:31pm

physics
what is the charge spheres of +12c and -7c when they brought to each other
Thursday, July 24, 2014 at 12:46pm

Physics
A car of mass is 100 kg applies break from 40 km per hours to 0 .it takes 12 seconds .what amount of force is applied for breaks?
Thursday, July 24, 2014 at 12:40pm

Science/Biology/Physics
Which of the following represents Boyle's gas law? A. Gas turns to a liquid when temperature reaches 0° C (32° F). B. As the volume of a gas increases, the temperature also increases. C. At any temperature, inert gases are less combustible than non-inert gases. D. ...
Thursday, July 24, 2014 at 10:49am

physics
A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 × 103 kilograms and an initial velocity of +20 meters/second. The car has a mass of 9.5 × 102 kilograms and an initial velocity of -26 meters/second. What is their total momentum after ...
Thursday, July 24, 2014 at 9:55am

physics
A downhill skier crosses the finishing line at a speed of 30 1 ms − and immediately starts to decelerate at 10 m s − 2 . There is a barrier 50 metres beyond the finishing line. (a) Find an expression for the skier’s speed when she is V metres beyond the ...
Thursday, July 24, 2014 at 9:31am

Physics
The voltage between the two plates inside of the air cleaner is 500 V. A soot particle whose mass is 10-12 kg and carries a charge of -1.0 x 10-11 C of charge enters the air cleaner. What will be the velocity of the soot particle as it moves from the negative to the positive ...
Thursday, July 24, 2014 at 3:37am

physics
The voltage between the two plates inside of the air cleaner is 500 V. A soot particle whose mass is 10-12 kg and carries a charge of -1.0 x 10-11 C of charge enters the air cleaner. What will be the velocity of the soot particle as it moves from the negative to the positive ...
Wednesday, July 23, 2014 at 9:35pm

Science/Biology/Physics
1. Giraffes have long necks that allow them to reach more food sources in their habitat. The long neck trait is an example of A. selection. B. adaptation. C. radiation. D. homology. 2. Which of the following is the most common kind of chemical bond in biological molecules? A. ...
Wednesday, July 23, 2014 at 6:54pm

Physics
If the distance between the spheres is halved,how will this affect the magnitude of the force? And also this other question here:what does the fact that the force is repulsive tell you about the charges?...PLEASE HELP,MY TEACHER WILL PUNISH ME IF I DON'T DO TSHIS HOMEWORK.
Wednesday, July 23, 2014 at 4:01pm

Physics
A 90 kg boy jogs on a circular track with a radius of 40 m at 5 m / s. What is the boy’s angular momentum with respect to the center of the track?
Wednesday, July 23, 2014 at 3:28pm

physics
a quaterback throws the football to a staionary receiver who is 23.5 m down the filed. if the football is thrown at an initial angle of 35 to the ground at what inital speed must the quaterback the ball for it to reach the receiver 5s later?
Wednesday, July 23, 2014 at 11:48am

physics
a force F is applied in horizontal to a 10kg block. the block moves at a constant speed 2m/s across a horizontal surface. the coefficient of kinetic friction between the block and the surface is 0.5. the work done by the force F in 1.5 minutes is?
Wednesday, July 23, 2014 at 10:08am

physics
a force of 20N compresses a spring with a spring constant of 50N/m. how much energy is stored in the spring?
Wednesday, July 23, 2014 at 10:05am

physics
A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= α t2− β t3, where α = 1.43m/s2 and β = 4.60×10−2m/s3 . 1)Calculate the average velocity of the ...
Wednesday, July 23, 2014 at 9:45am

physics
suppose that a 70.0kg box is pulled by a 400.N force at an angle of 30 degrees to the horizontal. the coefficient of sliding friction is 0.500. what is the acceleration of the box?
Wednesday, July 23, 2014 at 9:25am

PHYSICS
Ana run in a circular path. The dimension of the circular path is r = 10m , she finished it in 20 seconds. Find his speed, distance, displacement and velocity. 10m east (starting point) and 10 m south (finish point)
Wednesday, July 23, 2014 at 4:41am

physics
The electron in a certain hydrogen atom has an angular momentum of 6.834 × 10-34 J·s. What is the largest possible magnitude for the z component of the angular momentum of this electron? For accuracy, use h = 6.626 × 10-34 J·s. I know you need to use ...
Wednesday, July 23, 2014 at 12:09am

science, physics
A 4 μC point charge is on the x-axis at 1.1 m, and a 3 μC point charge is on the x-axis at 2.7m. Find the magnitude of the net electric field at the point on the y-axis where y = 3.7 m . The value of the Coulomb constant is 8.98755 × 109 N · m2/C2. ...
Tuesday, July 22, 2014 at 7:09pm

physics
A bullet of mass 20 g moving with a speed of 120 m/s hits a thick muddy wall & penetrates into it. It takes 0.03 s to stop the wall then what is the answer
Tuesday, July 22, 2014 at 11:27am

physics
a mosquito lands on a small bicycle wheel 10.2cm from the wheels center. If the wheel turns clockwise so that the mosquito travels along an arc lenght of 9 cm what is the mosquitos angular displacement?
Tuesday, July 22, 2014 at 10:33am

physics
A motor boat moves at a steady speed of 8 m s-1 if the water resistance to the motion of the boat is 2000 N calculate the power of the engine
Tuesday, July 22, 2014 at 3:24am

Physics
A projectile is fired with an initial velocity of 300m/s.upward at an angle of 30 degree with horizontal from a point 80m above the level plain. What horizontal distance will it cover before it strikes the plain?
Monday, July 21, 2014 at 10:40pm

physics
A 2.53-μC charged particle with a kinetic energy of 0.0929 J is fired into a uniform magnetic field of magnitude 0.147 T. If the particle moves in a circular path of radius 2.92 m, determine its mass.
Monday, July 21, 2014 at 8:05pm

physics
Fill in blank without a word bank (unit is wave nature of light) 1. As water waves travels through a slit barrier, they bend and spread out. This is known as ______ 2. Two identical waves will interfere destructively, cancelling one another out, when one lags behind the other ...
Monday, July 21, 2014 at 7:24pm

physics
(a) What is the acceleration of gravity on the surface of the moon? m/s2 (b) What is the acceleration of gravity on the surface (or outer limit) of Uranus? The mass of Uranus is 8.68 ✕ 1025 kg and its radius is 2.33 ✕ 107 m.
Monday, July 21, 2014 at 5:26pm

physics
If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed to take a 95 m radius curve banked at 15°. m/s (b) What is the ...
Monday, July 21, 2014 at 5:25pm

physics
A car is released from rest on a frictionless inclined plane. (Figure: twitpic com/e8nkhj) Calculate the momentum pi at the end of the plane in terms of measured quantities x, y, l, and m. Assume θ is very small so that h/l ~= y/x. (Hint: use conservation of energy and K...
Monday, July 21, 2014 at 2:57pm

physics
Three balanced forces pull on a ring that is centered over a force table. Two forces F1 and F2 are due to weights hanging from pulleys. A frictionless pulley changes the direction of a force without altering its magnitude. The third force F3 is applied by a string that passes ...
Monday, July 21, 2014 at 11:12am

physics
A horizontal slingshot consists of two light, identical springs (with spring constants of 23.7 N/m) and a light cup that holds a 1.97-kg stone. Each spring has an equilibrium length of 50 cm. When the springs are in equilibrium, they line up vertically. Suppose that the cup ...
Monday, July 21, 2014 at 10:42am

PHYSICS
two masses m1=400.g and m2 =600.g are connected with a light string which goes over a frictionless pulley of negligible mass. the two systems are released from rest. a) what is the acceleration of each mass? b) what is the tension force in the string? and c) what is the ...
Monday, July 21, 2014 at 8:22am

Physics
Please Help! Two ropes hold a 500N weight. Rope A (left) with an angle of 60° and rope B (right) with an angle of 30° to the horizontal. Find the tension in both ropes.
Monday, July 21, 2014 at 8:18am

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