Monday
July 25, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
a certain string vibrates in its fundamental frequency at 250 Hz. If the string is 15 cm long, what is the velocity of the wave in the string? What is the wavelength of the second harmonic frequency (the second wave which will fit into this length of string)?
Saturday, May 14, 2016 by Jason

Physics
An elastic cord can be stretched to it's elastic limit by a load of 2n.if a 35cm length of the cord is extended 0.6cm by a force of 0.5n.what will be the length of the cord when the stretching force is2.5n
Saturday, May 14, 2016 by Paul lazarus

Physics
Urgent. A density bottle weigh 0.25 when empty and 0. 75 when. Filled with water and 0.65N when filled with alcohol calculate the volume of water,the density of alcohol. Take density of water=1000kg/m3 acceleration due to gravity= 10m/s
Friday, May 13, 2016 by Adam

physics
what about a 5,000 kg truck rear-ends a 1200 kg car that has been traveling at 13 m/s, causing the truck to slow down from 14 m/s to 12 m/s and the car to speed up. What is the final velocity?
Friday, May 13, 2016 by Angie

physics
I need so much help, thanks in advance! Determine the gravitational energy of your 3kg physics binder a) relative to the table it sits on b) relative to the floor, 0.68 meters below the book c) relative to the floor 2.5 meters above the book
Friday, May 13, 2016 by Angie

physics
An object weighs 0.25N in air and 0.01N when immersed in water. Calculate (a) its relative density (b) its apparent weight in a liquid of density 800kgm^-3
Friday, May 13, 2016 by somay

physics
Two trains approach one another. Train A has a mass of 500,00 kg and is moving at 34.0 m/s. Train B has a mass of 350,00 kg and is moving at 42 m/s. They collide and stick together. What is the velocity and direction of the combined masses
Friday, May 13, 2016 by Angie

physics
A bat exerts force of 755N on a 320g ball that approaches the bat at 40 m/s and leaves at 64 m/s. How long was the ball in contact with the bat?
Friday, May 13, 2016 by Angie

Physics
How would you change the following Galilean transformation equations in the case where a frame was moving both in the x and the y direction? (Use the following as necessary: x, y, z, Vx, Vy, t.) x' = y' = z' = t' =
Friday, May 13, 2016 by Alyssa

Physics
Estimate the increase in rest energy of a copper sample [100 kg, c = 387 J/(kg · °C)] if its temperature is increased 100°C. -answer needs to be in kg please.
Friday, May 13, 2016 by Alyssa

physics
A bullet of mass 12 g is fired horizontally into a fixed wooden block with a speed of 20m/s. The bullet is brought to rest in the block in 0.1 seconds by a costant resistance. Calculate the (i) magnitude of the resistance (ii) distance moved by the bullet in the wood.
Friday, May 13, 2016 by somay

physics
An object weighs 0.25N in air and 0.01N when immersed in water. Calculate (a) its relative density (b) its apparent weight in a liquid of density 800kgm^-3
Friday, May 13, 2016 by somay

physics
A body is in equilibrium when three forces act on it. Two of the forces are F1 of magnitude 8N acting due east and F2 which is 5N acting N 60degree E. Find the magnitude and direction of the third force.
Friday, May 13, 2016 by somay

physics
Two equal sphere each weighting 1g hang by 2 equal silk thread from the same point the sphere are charged with in Contact and comes to rest with their centre 2 cm apart and 20 cm vertically below the point of support .find charge on sphere? solutions of this question
Friday, May 13, 2016 by kritika

Physics
During the investigation of a traffic accident that occurred in a 25 m/s zone, police find skid marks 60.0 m long corresponding to the distance the car traveled while braking to a halt. They determine that the coefficient of friction between the car's tires and the roadway...
Friday, May 13, 2016 by Jonas

physics
a person moves 15 km in north direction and then turns towards northeast and moves 10 km.find out the actual displacement ?
Friday, May 13, 2016 by subhasis ghosh

Science-Physics
As shown below, a 2.00 kg mass is connected to an unknown mass m via a massless rope and a massless, frictionless pulley. The mass m is on a ramp angled 20 degrees above the horizontal. The coefficients of kinetic and static friction are μk=0.35 and μs=0.45, ...
Thursday, May 12, 2016 by Justin

College Physics
A car moving at constant velocity of 14 m/s passes a gasoline station. two seconds later, another car leaves the gasoline station and accelerates at the constant rate of 2m/s^2. How soon will the second car overtake the first?
Thursday, May 12, 2016 by Patrick

College Physics
a delivery truck is 5km away from a car. The two started at the same time and headed towards the same direction. the delivery truck accelerates at 3m/s^2. If the car should overtake the truck in ten minutes, what should be the acceleration of the car?
Thursday, May 12, 2016 by Patrick

Physics
The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the ...
Thursday, May 12, 2016 by help please

Physics
You know that you can safely stand on the hang-over end of a heavy plank that rests on a table. How far depends on your mass and the mass of the plank. Suppose you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length. Then how ...
Thursday, May 12, 2016 by Armen

Physics
A particle executes simple harmonic motion such that at t = 0 it is at the amplitude of oscillation A = 22.5 cm. The period of the oscillation is 0.25 s. When is the first time this particle will be at x = -1/2 the amplitude, moving away from equilibrium?
Thursday, May 12, 2016 by Anonymous

Physics
1gram of redioactive material having a half life of 2years is kept in a store, calculate how much of the material will remain unchage?
Thursday, May 12, 2016 by King hezey

Physics
An empty density bottle weight 20g full of water and 60g when full of liquid
Thursday, May 12, 2016 by Anonymous

Physics - Fields
A fan causes a velocity field that falls off inversely with the distance from the fan. For one fan, the air speed at 1.3 m is 6.3 m/s. If two of these fans are placed 3 m apart, pointed at each other, what will be the air speed 1 m away from one of the fans?
Thursday, May 12, 2016 by PLEASE HELP ASAP

Physics
A model rocket is launced from the ground with an initial velocity of 65 m/s directly upwards. If a horizontal wind is blowing at 5 m/s during the flight, how far from the launch point will the rocket land? I know I should probably be using the equation x=x0+v0t+1/2at^2, but i...
Thursday, May 12, 2016 by Jessica

physics
A window is 50 long. A stone is falling from a height of 40 cm above the window.find the time taken by the stone to cross the window.
Thursday, May 12, 2016 by sofia

physics
A ball is thrown from a height h and another from 2h.find the ratio of time taken by the two balls to reach the ground.
Thursday, May 12, 2016 by sofia

physics
You throw a softball (of mass 300 g) straight up into the air. It reaches a maximum altitude of 17.9 m and then returns to you. What is the gravitational potential energy of the softball at its highest position? Assume the ball departed from and returned to ground level.
Thursday, May 12, 2016 by Bob

physics
A ball is thrown from a height h and another from 2h.find the ratio of time taken by the two balls to reach the ground.
Wednesday, May 11, 2016 by sofia

physics
A window is 50 long. A stone is falling from a height of 40 cm above the window.find the time taken by the stone to cross the window.
Wednesday, May 11, 2016 by sofia

physics
3 person are moving triangle place.their velocity are equal. they are follow each other after which time they should meet with each other?
Wednesday, May 11, 2016 by Anonymous

physics
The muzzle velocity of a projectile fired from a gun has an upward component of 49 m/s and a horizontal component of 60 m/s. A. What Maximum height does the projectile reach? B. How far forward does it go (assume a level surface) Show step by step and how you did it and explain.
Wednesday, May 11, 2016 by Amy

Physics
A photon has a frequency of 7.3 × 10–17 Hz. Planck’s constant is 6.63 × 10–34 J•s. The energy of the photon, to the nearest tenths place, is × 10–50 J.
Wednesday, May 11, 2016 by Chelsea

Physics
At time an object of mass 50.34 g on the end of a horizontal spring is moving to the right at 10 cm/s and is displaced 2 cm to the left from the equilibrium position. If the spring constant is 0.234N/m, find an expression for the position of the particle as a function of time.
Wednesday, May 11, 2016 by Supansa

PHYSICS
AN OBJECT 5.0 HIGH IS PLACED 35CM FROM CONCAVE MIRROR OF FOCAL LENGTH 15CM BY DRAWING A RAY DIAGRAM.DETERMINE THE POSITION,SIZE AND NATURE OF IMAGE
Wednesday, May 11, 2016 by Anonymous

physics help pls
Two masses of 200 grams and 400 grams are attached respectively at the end of the cord that passes through around a negligibly weight and frictionless pulley. a.) Find the acceleration of the system, b.) tension in each cord, c.) the distance and velocity of the masses when ...
Wednesday, May 11, 2016 by jine

Physics
A streetlight hanging above a road has what type of engrgy?
Wednesday, May 11, 2016 by Help me please

Physics
A hiker shouts when he is at the top of a mountain. He hears an echo 2.4 seconds later from the sounds reflection off a nearby mountain. Calculate how far he is from the nearby mountain. (Assume speed of sound in air is 340 m/s)
Wednesday, May 11, 2016 by Austin

Physics
How high will an arrow travel into the air when shot upwards? Bow stress: 68 J Arrow: 26 g (there is no air resistance)
Wednesday, May 11, 2016 by John

Physics
On the Round Up at the amusement park, people stand in a cylindical "room" of radius 6.18 m and the room rotates until it reaches a rotational frequency of 0.89 revolutions per second. At this point, the floor drops out. What is the minimum coefficient of static ...
Tuesday, May 10, 2016 by Kyle

Physics
A ball is projected so as to reach a height h passes points p and q with velocites v/2 and v/3 where v is the initial velocity with which the body is thrown the distance between p and q in terms of h is
Tuesday, May 10, 2016 by I!@#$%^&a

Physics
A particle executes SHM such that at a given time it is at x= +1/4 the amplitude, moving away from equilibrium, and 0.7 seconds later the particle has -1/6 the maximum speed moving away from equilibrium. Find the period of the motion.
Tuesday, May 10, 2016 by Anonymous

Physics
What is the wavelength of a 26250 Hz tone in air? The speed of sound in air is 340 m/s.
Tuesday, May 10, 2016 by Abby

Physics
A rock dropped into a pond produces a wave that takes 15.9 s to reach the opposite shore, 31.8 m away. The distance between consecutive crests of the wave is 3.1 m. What is the frequency of the wave?
Tuesday, May 10, 2016 by Abby

Physics
A particle executes SHM such that at a given time it is at x= +1/4 the amplitude, moving away from equilibrium, and 0.7 seconds later the particle has -1/6 the maximum speed moving away from equilibrium. Find the period of the motion.
Tuesday, May 10, 2016 by Anonymous

Physics
Arrange the steps required to focus a compound light microscope on low power in the correct order. Then write the numbers for the steps in the blanks. 1. Viewing from the side, raise the stage so that the slide almost touches the lens. 2. Move the low power objective lens into...
Tuesday, May 10, 2016 by HELP ASAP

Physics
Arrange the steps required to focus a compound light microscope on low power in the correct order. Then write the numbers for the steps in the blanks. 1. Viewing from the side, raise the stage so that the slide almost touches the lens. 2. Move the low power objective lens ...
Tuesday, May 10, 2016 by Hanny

Physics
The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the ...
Tuesday, May 10, 2016 by HELP ASAP

Physics
An engine rated at 5.0x10^4 watts exerts a constant force of 2.5x10^3 newtons on a vehicle.determine the average speed of the vehicle.
Tuesday, May 10, 2016 by Sam

Physics
Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5.34o and its period is 2.534 s.
Tuesday, May 10, 2016 by Supansa

Physics
At time an object of mass 50.34 g on the end of a horizontal spring is moving to the right at 10 cm/s and is displaced 2 cm to the left from the equilibrium position. If the spring constant is 0.234N/m, find an expression for the position of the particle as a function of time.
Tuesday, May 10, 2016 by Supansa

PHYSICS
A 6.00g bullet is fired horizontally into a 1.50kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is .30. the bullet remains embedded in the block, which is oserved to slide .25m along the surface before stopping. ...
Tuesday, May 10, 2016 by PETER

physics
A display sign is supported by a guy making an angle of 37o with the horizontal and by a bracket at the upper end near the vertical wall. The sign weighs 150N. Find A. The tension in wire B. The force exerted by the bracket on the sign.
Tuesday, May 10, 2016 by Chansa

Physics
a worker on the roof of a building that is under construction dropped a 0.125 kg wrench over the edge. another workman on the 8th floor saw the wrench go by and determined that its speed at that level was 33.1 m/s. the first floor of the building is 12.0m high and each ...
Monday, May 9, 2016 by lomonoyan

PHYSICS HELP Harmonic Motion
A 32.0 kg block at rest on a horizontal frictionless table is connected to the wall via a spring with a spring constant k= 32.0 N/m. A 2.00E-2 kg bullet travelling with a speed of 5.500E+2 m/s embeds itself in the block. What is the amplitude of the resulting simple harmonic ...
Monday, May 9, 2016 by Sam

Physics
Lightning strikes a hilltop that you can see, but do not know the distance to. If the thunder takes 10.52 seconds to reach you and the speed of sound in air is 340. m/s, how far away is the hilltop?
Monday, May 9, 2016 by person

Physics
A muzzleloading cannon has a maximum projectile velocity of 300. m/s. If the speed of sound in air is 340. m/s and the target is 1200. m away from the cannon, how much warning will the target have, assuming that it can't see the cannon?
Monday, May 9, 2016 by person

Physics
A rifle with a muzzle velocity of 1170. m/s is fired at a target that is 600. m away. If the speed of sound in air is 340. m/s, how long after the shot strikes the target will the sound of the rifle firing reach the target?
Monday, May 9, 2016 by original name

Physics
a worker on the roof of a building that is under construction dropped a 0.125 kg wrench over the edge. another workman on the 8th floor saw the wrench go by and determined that its speed at that level was 33.1 m/s. the first floor of the building is 12.0m high and each ...
Monday, May 9, 2016 by lomonoyan

Physics
After 10 years, a 100 mg sample of argon-42 has decayed to 81 mg. estimate the half life of argon-42. I'm on the last part 0.81=2^-10/h please help I don't know what to do from here it's kind of different
Monday, May 9, 2016 by Lomonoyan

physics
a box (mass = 12 kg ) is going south at 12 m/s. A second box (mass = 18 kg ) is going northwest at 15 m/s. they collide and stick together. what is their common velocity (magnitude and direction ) after the collision
Monday, May 9, 2016 by mike

physics
Three point charge of 2NC 7NC and - 4NC are located at the corners of an equilateral triangl as shown below. Caculate the magnitude and direction of the net force on the 7uc charge.
Monday, May 9, 2016 by james

physics
Three point charge of 2NC 7NC and - 4NC are located at the corners of an equilateral triangl as shown below. Caculate the magnitude and direction of the net force on the 7uc charge.
Monday, May 9, 2016 by james

Physics
An object of weight W hangs by three ropes as shown above. What is the value of the angle @ if T1 = T2 = W? ____________ \@ @/ T2\ /T1 \__/ |W| a) 15 b) 30 c) 40 d) 45 e) 60
Monday, May 9, 2016 by Tyler

physics
A fire hose a stream of water at an angle of 35degree above the horizontal. The water leaves the nozzle with a speed 25m/s. Assuming that the water behave like a projectile ,how far from a building should the fire hose be located to hit the highest possible fire?
Monday, May 9, 2016 by afika

physics
Calculate the angular momentum of the Earth the arises from its spinning on its axis. Also calculate the angular momentum of the Earth that arises from its orbital motion around the sun. Please help I'm stumped on a take home test.
Sunday, May 8, 2016 by nouh

physics
The radius of a roll of paper is 7.6 cm and its moment of inertia is I = 2.9 × 10^3 kg·m2. A force of 3.2 N is exerted on the end of the roll for 1.3 s, but the paper does not tear so it begins to unroll. A constant friction torque of 0.11 m·N is exerted on...
Sunday, May 8, 2016 by Anne

physics
A soccer player kicks the ball toward a goal that is 16,8m in front of him . The ball leaves his foot at a speed of 16,0m/s and an angle 28,0degree above the ground.Find the speed of the ball when the goalie catches it in front of the net?
Sunday, May 8, 2016 by afika

physics
A drives straight off the edge of a cliff that is 54m high.the police at the scene of the accident obseve that the point of impact 130m from the base of the cliff.How fast was the car traveling when it went over the cliff?
Sunday, May 8, 2016 by afika

physics
Oasis B is 8.0 km due east of oasis A. Starting from oasis A, a camel walks20 km in a direction 15.0° south of east and then walks32 km due north. If it is to then walk directly to B, (a) how far and (b) in what direction (relative to the positive x-axis within the range...
Sunday, May 8, 2016 by bea

physics
a uniform beam with a weight of 51.3 N and a length of 3.23 m is hinged at its lower end, and a horizontal force Upper F Overscript right-arrow EndScripts of magnitude 64.0 N acts at its upper end. The beam is held vertical by a cable that makes angle θ = 20.7° with ...
Sunday, May 8, 2016 by bert

Physics
A 70 kg student holds a 2.0 kg mass in each hand and is sitting on a stool that can rotate freely about a vertical axis. With the masses held at arm’s length (0.9 m) the student is set spinning at 1.2 revolutions per second. a. If we approximate the student as a uniform ...
Sunday, May 8, 2016 by Rob

Biomechanics/Physics
A 125 pound female is late for her biomechanics final and after arriving dashes up 40 steps each 15cm high in 1.65 seconds to take a seat and start the test. Hint: 1 lb = 4.47N How much work did she perform running up the steps?
Saturday, May 7, 2016 by Frank

Physics
7 g bullet is fired into a 124 g block that is initially at rest at the edge of a frictionless table of height 1.3 m. The bullet remains in the block, and after impact the block lands 2.2 m from the bottom of the table. Find the initial speed of the bullet. The ...
Saturday, May 7, 2016 by Hannah

physics
For the reaction in question 2 above, determine the predicted yield for Mg(OH)2 and H2. What is the actual yield for these products if the percent yield is 80 percent?
Saturday, May 7, 2016 by Darwin

Physics
Three dynamics carts have force sensors placed on top of them.(cart 1, with mass of 2.2 kg, has one sensor --> cart 2, with mass of 2.5 kg, has sensors two and then three --> cart 3, with mass of 1.8 kg, has sensors four then five). Each force sensor is tied to a string ...
Saturday, May 7, 2016 by anon

Physics
An archiolohist begins a trip by first walking 30km southeast from the campsite. He stops and sets up a temporal camp for the night.On the second day, he walks 60 km in direction 60degrees northeas, at which point he discovers the ancient city of gold. (a) detaimine the ...
Saturday, May 7, 2016 by Mathews

Physics
A person walks 25 northeast 3.10km.How far would she have to walk due north and due east to arrive at the same point?
Saturday, May 7, 2016 by Mathews

physics
An archiolohist begins a first trip by first walking 30km southeast from the campsite. He stops and sets up a temporal camp for the night.On the second day, he walks 60 km in direction 60degrees northeast, at which point he discovers the ancient city of gold. (a) detaimine the...
Saturday, May 7, 2016 by Mathews

physics
The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with an acceleration of - 5.6m/s for 4.20s marking straight skid marks 62.4m long ending at the tree.With what speed does the car strike the tree?
Saturday, May 7, 2016 by Mathews

Physics
3 equal charges each of of 2*10-6 C are fixed at three corners of an equilateral triangle ofsides 5 cm.find the column force experienced by one of the charge due to the rest two.
Saturday, May 7, 2016 by Prem

physics
find the initial velocity of a car stop in 10 second by applying breaks the reaction due to break is 2.5 metre per second square
Saturday, May 7, 2016 by Harsh Singh

physics
a truck moving at 100kph has a mass of 27000 kg. what force is necessary decelerate it at rate of -3 m/s²?
Saturday, May 7, 2016 by enjen

Physics
A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 s. The smallest current the circuit can detect reliably is 0.32 μA . Assuming that all photons reaching the solar cell give their energy to a charge carrier, what is the minimum power of a ...
Friday, May 6, 2016 by Joshua

physics
13. A red car of mass m is heading north (direction 0°). It collides at an intersection with a yellow car of mass 1.3m heading east (direction 90°). Immediately after the collision, the cars lock together and travel at in direction 42°. What is the speed of the ...
Friday, May 6, 2016 by Phillip

physics
A convex mirror of focal length 30cm. produces a real and inverted image of magnification 0.5.by how much distance the object should be brought closer to obtain a virtual and erect image of magnification 2?
Friday, May 6, 2016 by kanupriya

physics
A convex mirror of focal length 30cm.produces a real and inverted image of magnification 0.5. By how much distance the object should be brought closer to obtain a virtual and erect image of magnification 2?
Friday, May 6, 2016 by kanupriya

Physics
A uniform rod 2m long has a force 80N applied downward at one end. Another force 6N applied downward at the other end. At what point under the rod should the pivot be placed to keep it in equillibrim?
Thursday, May 5, 2016 by Benjamin

physics
What is the velocity of a projectile with initial velocity 2m/s at an angle of 30degree to horizontal at the time 0.2s,0.5s,0.8s.Find the maximum height attained by projectile,total horinzontal distance travelled,seconds the projectile remains in air?what is the velocity of ...
Thursday, May 5, 2016 by murtem

physics
A firing from the top of the building of height 10m at an angle 30degree to vertical towards ground has the firing velocities of 10m/s.what is the hit velocity?
Thursday, May 5, 2016 by murtem

physics
can u solve this question? When a body hanging from a spring balance is immersed in water it floats just below the surface of water and shows 100g loss in its weight: 1. What is the weight of the body in water , air , upthrust on the body and what is the volume of the body?
Thursday, May 5, 2016 by samar

Physics
When light passes from one medium to another then which of the following parameters may change? Velocity, frequency, colour or wavelenght?
Thursday, May 5, 2016 by Sukriti

physics
A golf ball with a mass of 0.080kg initially at rest is given a speed of 50 m.s-1 when it is struck by a golf club. A) If the club and ball are in contact for 1.5 millisecond (0.0015 seconds), What average force acts on the ball? B) What impulse was delivered? c) What was the ...
Thursday, May 5, 2016 by Rosie

Science (PhYsics)
A tire 0.5m in radius rotates at a constant rate of 200 rev/min. find the speed and acceleration of a stone lodged in the tread of the tire (on its outer edge)
Thursday, May 5, 2016 by Chulu

Physics
A model rocket was launched Amazon man of its height and horizontal distance from launch pad where they can as shown in the table
Thursday, May 5, 2016 by Physics

Physics
A cubical metal box has side L=10.34cm and mass m=150 g. How much mass must be placed inside the box if it is to float in water with its top at the surface?
Thursday, May 5, 2016 by Supansa

Physics
An engineer decides to use a successful dam design for a new lake of the same depth. If the new lake has ten times the surface area as the lake held by the original dam, what, if any, design changes are necessary for the new dam to hold back the increased amount of water? ...
Thursday, May 5, 2016 by Supansa

Physics
A pipe of constant diameter 13.4 cm carries water up a hill 30.34 m high. How much pressure is required at the bottom of the hill if the water is to reach the top?
Thursday, May 5, 2016 by Supansa

Physics
Abby went skiing and was sliding down a 10 degrees hill. Ignore friction and air resistance. What is the x-component of the weight? The mass is 76-kh
Thursday, May 5, 2016 by Anonymous

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Homework Help: Science