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October 23, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
A person has a 2 resistance coils. By using them singly, in series or in parallel, he obtains 2 ohm, 4 ohm, 12 ohm, and 16 ohm. What is the new resistance?
Wednesday, May 21, 2014 at 10:41am

physics
A man stands on his balcony, 120 ft above the ground. He looks at the ground, with his sight line forming an angle of 50 degrees with the building, and sees a bus stop. The function d = 120 sec θ models the distance form the man to any object given his angle of sight &#...
Wednesday, May 21, 2014 at 10:38am

Physics Please help4
Two 1.50cm -diameter disks spaced 1.80mm apart form a parallel-plate capacitor. The electric field between the disks is 5.10×10^5 V/m I got the voltage as =918 but B. How much charge is on each disk? _________C? and C. An electron is launched from the negative plate. It ...
Wednesday, May 21, 2014 at 3:57am

Physics Please help3
A point charge with charge q1 = 3.10μC is held stationary at the origin. A second point charge with charge q2 = -4.60μC moves from the point ( 0.160m , 0) to the point ( 0.270m , 0.255m ). How much work W is done by the electric force on the moving point charge? ...
Wednesday, May 21, 2014 at 3:56am

Physics Please help2
Two small insulating spheres with radius 7.00×10^−2m are separated by a large center-to-center distance of 0.565m . One sphere is negatively charged, with net charge -2.05μC , and the other sphere is positively charged, with net charge 4.10μC . The charge...
Wednesday, May 21, 2014 at 3:54am

Physics Please help
A thin, horizontal 20cm×20cm copper plate is charged with 1.7×10^10 electrons. Consider the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? E=____ N/C B. What...
Wednesday, May 21, 2014 at 3:53am

physics
A uniform rod 30cm long is pivoted at it's center. A 40N weight is hung 5cm from the left end. where must the 50N weight be hung to maintain equilibrium?
Wednesday, May 21, 2014 at 3:15am

Physics
How do observations of the photoelectric effect conflict with the predictions of classical physics?
Wednesday, May 21, 2014 at 12:20am

Physics
The earth's magnetic field a) is slightly off centre compared to the Earth's rotational axis of rotation b) has its magnetic south pole at the geographic north pole c) attracts the north end of the compass needle to the geographic north pole d) all of the above 2. A ...
Tuesday, May 20, 2014 at 11:32pm

language help !
Albert Einstein, a world-famous mathematician was born in Bavaria in 1879. He acquired Swiss nationality in 1901 and he began working at the Swiss patent office the next year. Einstein was however also publishing papers in physics. He became famous for his theories of ...
Tuesday, May 20, 2014 at 10:31pm

physics
If I put the tip of a 100 foot pipe in the ocean and applied a perfect vacuum to the top, how high would the water rise in the pipe?
Tuesday, May 20, 2014 at 9:57pm

Physics
An airplane whose air speed is 600 mi/h is flying perpendicularly to jet stream whose speed relative to the Earth's surface is 100 mi/h. What is the airplane's speed relative to the Earth?
Tuesday, May 20, 2014 at 8:21pm

physics
A 3.0 L balloon at 300 K is placed in a cooler at 225 K. What is the volume of the balloon after it has been in the cooler?
Tuesday, May 20, 2014 at 8:15pm

physics
An electric stove operates on a larger 220 V line. How much power is needed to cook a pizza if 0.45 A of current is used.
Tuesday, May 20, 2014 at 8:01pm

physics
A pulley applies a force of 200 N over a distance of 15 m to raise a 530 N drum 4 meters. Calculate the work output done by the pulley.
Tuesday, May 20, 2014 at 7:42pm

physics
An electron has an initial speed of 2.95 × 105 m/s.If it undergoes an acceleration of 2.7 × 1014 m/s^2, how long will it take to reach a speed of 5.94 × 105 m/s?
Tuesday, May 20, 2014 at 7:41pm

physics
A 4.0 kg ceiling fan is placed 2.5 m above the floor. What is the gravitational potential energy of the fan(use Earth's value for gravitational acceleration)?
Tuesday, May 20, 2014 at 7:31pm

Physics
What is the mass (in Grams) of a block of aluminum that has a volume of 385 mL
Tuesday, May 20, 2014 at 7:24pm

Physics
I don't want an answer I would just like to know what equations to use to answer the questions. It's confusing me. i. imgur. com/6CouaRj .png An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion...
Tuesday, May 20, 2014 at 6:25pm

Physics
A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?
Tuesday, May 20, 2014 at 5:27pm

Physics
1.How are alternating and direct current different? 2.Who invented direct current? 3.Who invented alternating current? 4.What are some of the advantages of alternating current? 5.Do all devices that plug into the wall run on alternating current? Why/why not? 6.What is the ...
Tuesday, May 20, 2014 at 3:33pm

physics
A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 7.5 cm diameter hose delivering 450 L/min through a 0.80cm diameter nozzle?
Tuesday, May 20, 2014 at 9:55am

Physics
How to solve? 2. A 70.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 10.0 m) and spun at a constant angular velocity of 16.3 rpm. Answer the following: a. What is the angular velocity of the centrifuge in ...
Tuesday, May 20, 2014 at 6:46am

Physics
Resolve a force of 7.5N acting at an angle 40 to its horizontal an vertical components.
Tuesday, May 20, 2014 at 5:03am

physics
what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
Tuesday, May 20, 2014 at 4:58am

Physics
A small block with a mass of m = 0.120 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.40 m from the hole with a speed of 0.70 m/s. The cord is pulled from below, shortening the radius ...
Tuesday, May 20, 2014 at 2:45am

Physics
A force of 800 N stretches a spring a distance 0.200 m horizontally. a) What is the potential energy of the spring when it is stretched 0.200m b) What is its potential energy when it is compressed 5.00cm This is a conservation of energy problems. The potential is elastic and ...
Tuesday, May 20, 2014 at 2:44am

Physics
Help with Physics homework Please and thank you!? I need help on these two questions. I'm not looking for the answer because I really need to learn how to do this on my own. But if someone could show me what equations to use to answer the steps in the questions and explain...
Tuesday, May 20, 2014 at 2:03am

Physics
a 40kg girl and a 30kg boy face each other on friction free roller skates. the boy pushes the girl,
Monday, May 19, 2014 at 10:51pm

Physics
Calculate the equilibrium position of a third charge of 6.79 x 10^-9 C that is positioned between an 8 x 10^-9 C charge and a 12 x 10^-9 c charge.
Monday, May 19, 2014 at 9:59pm

physics
Calculate the gravity on a planet using a pendulum that has a period of 2.45 s having a length of 1.25 m.
Monday, May 19, 2014 at 9:57pm

Physics
2.0 kg weight is on simple, horizontally oscillation (in a spring) with the time 1.8 s. The distance between the outmost dots in the oscillation is 0.16 m. a) What is the angular speed (w) of the oscillation ? b) What is the force constant (k) of the spring? c) What is the ...
Monday, May 19, 2014 at 12:19pm

physics
if a train travell at speed of 90km/hour. and when the break applied at 5m/sec2. how much it will travel before stoping
Monday, May 19, 2014 at 11:45am

physics
Suppose an object is placed at a distance x from a screen and a converging lens of focal length f is placed between the object and the screen. What is the minimum separation distance x (in terms of f) for a real image to be formed on the screen? Support your answer with either...
Monday, May 19, 2014 at 11:30am

Physics
What is the centre of mass if the mass of the earth is 81 times that of the moon and the distance between them is 384 Mm=60 rj ?
Monday, May 19, 2014 at 8:44am

Physics
How long would the year be if the distince of the earth from the sun where 20% more?
Monday, May 19, 2014 at 7:52am

Physics
2.0 kg rock in a 0.80 ling sting is swung vertically in circles. a) What does the speed of the rock to be so the string holds tight? b) what is the pulling force if the speed is 5.0 m/s?
Monday, May 19, 2014 at 5:32am

Physics
An object with mass 8.5kg is moving vertically upward with a velocity if 35m/s at a height of 100m above the ground. Find the time the object takes to reach the ground Thanks!!
Monday, May 19, 2014 at 4:53am

physics
two copper wires A and B are of the same length. If the diameter of A is 3 mm and its resistance is 3 ohms, what is the diameter of B if its resistance is 0.08 ohm ?
Monday, May 19, 2014 at 3:42am

physics
An object 3.60 cm tall is placed 13.1 cm in front of a mirror, which creates an upright image that is 5.21 cm in height. a) What is the magnification of the image? b) What is the radius of curvature of the mirror? Answer in units of cm
Monday, May 19, 2014 at 3:08am

Physics
a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate
Monday, May 19, 2014 at 3:04am

physics
Why do the passengers in high-altitude jet planes feel the sensation of weight while passengers in the International Space Station do not?
Monday, May 19, 2014 at 2:00am

physics
A simple lever is used to lift a heavy load. When a 60-N force pushes one end of the lever down 1.2 m, the load rises 0.2 m. Show that the weight of the load is 360 N.
Monday, May 19, 2014 at 1:58am

physics
Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
Monday, May 19, 2014 at 1:56am

Physics
A 0.15kg baseball pitched at 30 m/s is hit on a horizontal line drive straight back at the pitcher at 46.0 m/s. If the contact time between bat and ball is 5x10^-3 s, calculate the force (assumed to be constant) between the ball and bat. [Hint: impulse!] I did FΔt = Δ...
Sunday, May 18, 2014 at 9:32pm

Physics
Suppose the mass of the stick is 200 g, and a single 500-g mass is to play "solitary seesaw" at the 0-cm mark. Where should the fulcrum be located?
Sunday, May 18, 2014 at 8:58pm

physics
an electron in the second energy level absorbs a photon of energy 6 ev what's the speed of the ejected electron? I have tried to manipulate and use the kinetic energy equation, c= lamba x f, and many other ways, but I don't know why can't get the answer, which is v...
Sunday, May 18, 2014 at 8:28pm

Physics
An airplane flies at 120 km/h takes a 20 degree turn on 30 seconds. a) What is the centripetal acceleration ? b) from where does it get it's centripetal acceleration ?
Sunday, May 18, 2014 at 5:43pm

Physics
A ball (m = 250g) on the end of string swings in 1.2 m radius that tolerates 20 N. At what speed does the string breaks if a) the rings swings horizontally ? b) the rings swing vertically? I think I got a) right: T=mv2/r ---> v=(sqr)Tr/m v=(sqr) 20x1.2/0.25= 9.8 m/s Given ...
Sunday, May 18, 2014 at 4:40pm

Physics
A yo-yo is spun from rest by pulling on the string with a constant tension of 2.0 N. The radius of the inner rod on which the string is strung round is 0.50 cm. The tension is applied for 5.0 seconds after which the yo-yo is observed to spin with an angular velocity of 15 rad/...
Sunday, May 18, 2014 at 3:02pm

physics
In an electric field an electron is kept freely. If the electron is replacee by a proton, what will be the relationship between the forces experienced by them?
Sunday, May 18, 2014 at 3:15am

Physics
How can the more wind speed and force, results greater amount of power for the wind turbine?
Sunday, May 18, 2014 at 2:18am

Physics
Assuming zero drag, how long, in seconds, would it take a super ball to fall 25 feet? What would its velocity be at that point (in mph)?
Saturday, May 17, 2014 at 6:54pm

Physics
A car takes a turn with the radius of 150 m at the speed of 30m/s. a) Calculate the acceleration at 60 degree angle around the curve. the answer is 5.7m/s2, What formula do I use ?
Saturday, May 17, 2014 at 5:44pm

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 at 4:43pm

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 at 4:39pm

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 at 4:36pm

Physics
The distance between two successful crestof a water wave travelling at 3.6 m/s is 0.45m. Cal culate the frequency of the wave
Saturday, May 17, 2014 at 4:19pm

Physics
A wave sent out from a source is reflected back to the source in 1.9x10^-3 seconds .if the velocity of the wave is 3.0x10^8 m/s, the distance of the reflecting surface from the source is ?
Saturday, May 17, 2014 at 4:14pm

physics
A physics book slides off a horizontal tabletop with a speed of 1.10m/s{\rm m}/{\rm s} . It strikes the floor in 0.350s{\rm s} . Ignore air resistance.
Saturday, May 17, 2014 at 3:25pm

physics
A rocket of mass 100,000 kg undergoes an acceleration of 2 m/s2. Show that the net force acting on it is 200,000 N.
Saturday, May 17, 2014 at 2:06pm

Science Physics
Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.
Saturday, May 17, 2014 at 2:05pm

Science Physics
Madison pushes with a 160-N horizontal force on a 20-kg crate of coffee resting on a warehouse floor. The force of friction on the crate is 80 N. Show that the acceleration is 4 m/s2.
Saturday, May 17, 2014 at 2:03pm

Physics
A ball rolls down a 1.00 m long and 0.40 m inclined plane and falls off down on the floor, 1.20 m. a) Calculate the speed of the ball when it falls of the plane and the speed in vertical and horizontal direction. b) Where does the ball land? c) At what speed and under what ...
Saturday, May 17, 2014 at 1:14pm

physics
A bike of wheel radius. 40 cm at its highest speed its meter show 300RPM.then evalute the speed of the bike on this reading
Saturday, May 17, 2014 at 11:39am

Physics
A car drives around a curve with radius 150 m at a speed of 30 m/s. What is the average acceleration at? a) 180 degrees. b) 60 degrees around the curve ? Given answers are:3.8 m/s2 and 5.7 m/s2 Help please :))
Saturday, May 17, 2014 at 9:06am

Physics
You are driving down the highway late one night at 20 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 10 m/s2 . How much distance is between you and the deer when...
Friday, May 16, 2014 at 8:30pm

Physics
An object gets the acceleration 8.0 m/s2 in a vertical direction (y) but 5.0 m/s2 in a horizontal direction (x). What will be the position of the object at the time t=2.0 s if his initial postiotion was (0,0), initial speed in y-direction 0 and in x-direction 5.0 m/s? Given ...
Friday, May 16, 2014 at 5:29pm

Physics
The position of an object is described as x = 4.0t and y= 1.5t2 - 2t + 1.0. All factors are in SI-units. a) What is the begining velocity of the object? b) What is his acceleration? c) What is the direction along the x-axe at the time t=1.0 s ? Given answers are: 4.5 m/s in -...
Friday, May 16, 2014 at 3:35pm

physics
A table clock has its minute hand 4.0 cm long. find the average velocity of the tip of the minute hand (a) between 6am to 6.30am and (b) between 6am to 6.30pm
Friday, May 16, 2014 at 3:01pm

physics
2 particles ar moving with constant speed v such that they are always at a constant distance d apart and their velocities are always equal and opposite. After what time they return to their initial positions?
Friday, May 16, 2014 at 2:55pm

physics
A ball is projected horizontally from the top of a 98m high cliff with an initial speed of 14.4 m/s. Determine the magnitude of the final speed the instant prior to hitting the ground
Friday, May 16, 2014 at 12:10pm

physics
Determine the launch speed of a horizontally-launched projectile which lands 27.4 meters from the base of a 17.9-meter high cliff.
Friday, May 16, 2014 at 12:10pm

physics
A soccer ball is kicked horizontally at 16.1 m/s off the top of a field house and lands 37.5 metes from the base of the field house. Determine the height of the field house.
Friday, May 16, 2014 at 12:10pm

physics
john and paul are trying to move a 100kg piano which is resulting on a flat, smooth floor. John pushing towards the North, while Paul is pushing towards the East. Both are exerting a 100N force. What is acceleration of the piano (magnitude and direction)? A=200/100=2m/s^2 ...
Friday, May 16, 2014 at 3:07am

physics
john and paul are trying to move a 100kg piano which is resulting on a flat, smooth floor. John pushing towards the North, while Paul is pushing towards the East. Both are exerting a 100N force. What is acceleration of the piano (magnitude and direction)? A=200/100=2m/s^2
Friday, May 16, 2014 at 2:00am

physics
a pendulum is swinging back and forth once every 1.25 second, how much longer should the pendulum be to increase its period by 0.200 second
Friday, May 16, 2014 at 1:58am

Physics
A 6.0kg box is on a frictionless 45∘ slope and is connected via a massless string over a massless, frictionless pulley to a hanging 2.4kg weight. What is the tension in the string if the 6.0kg box is held in place, so that it cannot move? If the box is then released, ...
Friday, May 16, 2014 at 12:37am

Physics
Two-thirds of the weight of a 1500kg car rests on the drive wheels. Assume that μs = 0.74. What is the maximum acceleration of this car on a concrete surface?
Friday, May 16, 2014 at 12:35am

physics
Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...
Thursday, May 15, 2014 at 10:03pm

Physics
A rescue team has to use a specially designed sling-shot to supply emergency medicine to a stranded hiker. The hiker's altitude above the ground is 320m and his horizontal distance from the launch site is 410m. The launching angle of the initial velocity is 68 degrees from...
Thursday, May 15, 2014 at 7:16pm

physics
Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...
Thursday, May 15, 2014 at 5:49pm

Physics
Calculate the escape velocity of a satellite launched from the earth surface if the radius of the earth is 6.4x10^6m
Thursday, May 15, 2014 at 4:21pm

Physics
Please help me go through this F = q1q2/r^2, i know this is the equation, but i dont know how to get the answer, please help. What is the electric force between a +2 µC point charge and a –2 µC point charge if they are separated by a distance of 5.0 cm? Show ...
Thursday, May 15, 2014 at 4:20pm

Physics
A police car is asked to overtake a red sedan that is 1.6 km ahead of it on the freeway. The red sedan is traveling at 80 km/hr and the police car travels at 100 km/hr. When will the police car overtake the sedan?
Thursday, May 15, 2014 at 2:25pm

physics
croquet ball must have a set mass of 0.50 kg. a red ball moving at 10.0 m/s, strikes an at-rest green ball head on. The red ball continues moving at 1.5 m/s after it hits the green ball. What is the final speed of the green ball?
Thursday, May 15, 2014 at 1:29pm

physics
Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −. Write M in the standard basis. If M is the Hamiltonian acting on a qubit which is in the state |ψ(0...
Thursday, May 15, 2014 at 4:16am

Physics
A person of mass 50.0 kg is at the bottom of a cave. The cave has a depth of 32.5 meters and the person is to be pulled out of the cave vertically by a rope, starting from rest. What is the shortest amount of time that this could take if the rope can withstand a maximum ...
Wednesday, May 14, 2014 at 9:48pm

st anthenis physics
A+B+C=0out of three vector two r equal in magnitudeand magnitude of third is root 2times that of eitherof two hsving equal magnitude.than angle beteen vectors r
Wednesday, May 14, 2014 at 8:16am

st francis physics
|AxB|=root 3A.B then A+B=
Wednesday, May 14, 2014 at 8:10am

Physics (acceleration)
1. Jasmine rode a horse down a path headed north. she started from rest and then accelerated at 0.5 m/s2 for 12 seconds and then travelled at a constant speed for 28 seconds. a.) what was her velocity after 12 seconds? b.) what was jasmines displacement after 10 seconds? c.) ...
Wednesday, May 14, 2014 at 12:05am

physics
A square loop of wire of side 2.8 cm carries 3.0 A of current. A uniform magnetic field of magnitude 0.67 T makes an angle of 43° with the plane of the loop. (a) What is the magnitude of the torque on the loop? (b) What is the net magnetic force on the loop?
Tuesday, May 13, 2014 at 11:17pm

Physics -- HELP PLEASE
. Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 at 11:00pm

physics
a disk of mass M and radius R is attached to a spring of constant k .the disk rolls back and forth without slipping. the angular frequency of the motion of the disk is
Tuesday, May 13, 2014 at 9:50pm

physics
water in a dam is 15 m deep. a horizontal pipe of 4 cm diameter passes through the wall of the dam below the surface of water. a plug secures the pipe opening. the frictional force between the plug and pipe wall is about?
Tuesday, May 13, 2014 at 9:32pm

physics
An airplane is 5,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.
Tuesday, May 13, 2014 at 8:58pm

Physics
Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 at 5:45pm

Physics
Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 at 5:45pm

Physics
A roller-coaster car is moving at 20.0 m/s along a straight horizontal track. What is its speed after climbing a 15.0 m hill? Neglect the effects of friction.
Tuesday, May 13, 2014 at 5:38pm

Physics
The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? B...
Tuesday, May 13, 2014 at 5:17pm

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