Monday
May 30, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius
Wednesday, May 18, 2016 by Ruth

physics help grade11
In a physics laboratory experiment, a 6.00 kg box is pushed across a flat table by a horizontal force F. A. If the box is moving at a constant speed of 0.35 m/s and the coefficient of friction is 0.12. What is the magnitude of F? B. What is the magnitude of F if the box is ...
Wednesday, May 18, 2016 by jyne

Physics
A man starts running from his home towards east . After covering 60m ,he turns north and runs 80m. If he runs at uniform rate and covers the distance in 1 minute ,then what is its acceleration?
Wednesday, May 18, 2016 by Mohit

Physics
A 67.6 ohms resistor is connected in parallel with a 103.8 ohms resistor. This parallel group is connected in series with a 20.8 ohms resistor. The total combination is connected across a 18.2-V battery. Find a) the current and b) the power dissipated in the 103.8 ohms resistor.
Wednesday, May 18, 2016 by Ellie

physics
A race car accelerates from 50 m/s to 75 m/s over a distance of 400 m. What is the race car’s acceleration?
Wednesday, May 18, 2016 by eli

physics
Find the number of moles in 2.00 L of gas at 35.0°C and under 7.41×107 N/m2 of pressure. Select one: a. 0.051 moles b. 51 ×105 moles c. 58 moles d. 5.8 moles
Tuesday, May 17, 2016 by Sandra

physics
Four items, all with equal masses, are used to construct the device depicted to the right. Two of the items are uniform solid disks, the smaller of which has half the radius of the other. The disks are glued together so that they share a common axle. The other two items are ...
Tuesday, May 17, 2016 by ChrismB

physics
A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the ...
Tuesday, May 17, 2016 by Lily

Physics
A ray of light is incident on a material with reflective indeed n=1.46. if the material has thickness w=2.6mm; how many times does the light take to pass through the material?
Tuesday, May 17, 2016 by Lily

physics
Two bar magnets (1) and(2) orthogonal to each other create at point M (intersection of their supports) the respective magnetic field vectors B1 and B2 of intensity: B1=o.oo3T and B2=0.004T a)Determine the names of the poles of the magnets. b)Construct the resultant field ...
Tuesday, May 17, 2016 by angy

physics multiple choice
1)A coil of length 1cm has N turns and carries an electric current I. It creates at a point M a magnetic field of intensity B. -If a current 3I is sent in the coil the field strength at M becomes: a. 3B b. B/3 c. B -If the number of turns per unit length is doubled the field ...
Tuesday, May 17, 2016 by angy

physics
A. State Ohm’s law B.Describe the process of electrolysis C. What is the relationship between resistance and resistivity D. What is the current through 8Ω device operating with 120V The potential difference required to pass 3A through 42Ω. E. Describe what is ...
Tuesday, May 17, 2016 by Chansa

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 17, 2016 by Chansa

physics
A ladder rests against a smooth wall (by smooth wall, we mean that the wall exerts in the ladder only a force that is perpendicular to the wall. There is no friction force). The ladder weighs 200N and its center of gravity is 0.4L from the base, where L is the ladder’s ...
Tuesday, May 17, 2016 by Chansa

Physics
An air plane has a mass of (1.7x10 to power 6) kg, and the air flow past the lower surface of the wings at 95m/s. If the both wings have a surface area of 1200cubic metre, how fast must the air flow over the upper surface of the wings if the plane is to stay in the air?
Tuesday, May 17, 2016 by Veronica

physics
a stone is thrown vertically upward from tower takes 5 sec to reach ground the height of tower is
Tuesday, May 17, 2016 by nandan

Physics
1) The electric potential at any point x, y, z in metres is given by V = 3x2. The electric field at a point (2 m, 0, 1 m) is
Tuesday, May 17, 2016 by Anushka

Physics
During each heart beat, approximately 70cubic cm of blood is from the heart at an average pressure of 105mmHg. Calculate the power output of the heart, in watts, assuming 70 beats per minute.
Tuesday, May 17, 2016 by Veronica

physics
Two blocks are connected with a light string that is hung over a pulley, as shown in the diagram to the right. One block has twice the mass of the other, and the pulley has the same mass as the heavier block. The pulley consists of a solid, uniform circular disk. The heavier ...
Tuesday, May 17, 2016 by ChrismB

Physics
A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the ...
Tuesday, May 17, 2016 by Matthew

Physics
A uniform bar weighing 60N has a length of 4m and it is supported at its ends by a string. A load W=20N is placed at some point on the bar such that it is in equilibrium when the tension in the string at the left end is 80N, a) locate tge position of W. b) find the tension in ...
Monday, May 16, 2016 by Drew Gonzales

Physics
A uniform bar weighing 60N has a length of 4mamd it is supported at its ends by a string. A load W=20N is placed at some point on the bar such that it is in equilibrium when the tension in the string at the left end is 80N, a) locate tge position of W. b) find the tension in ...
Monday, May 16, 2016 by Drew Gonzales

Physics
Is the tension on a rope zero just before a person releases it after swinging from one side of a river to the other?
Monday, May 16, 2016 by Veronica

physics help me
Four items, all with equal masses, are used to construct the device depicted to the right. Two of the items are uniform solid disks, the smaller of which has half the radius of the other. The disks are glued together so that they share a common axle.The other two items are ...
Monday, May 16, 2016 by Asfand

Quick physics help
you are in a canyon and yell across. it takes 4 seconds it takes 4 seconds for the echo to come back how wide is the canyon?
Monday, May 16, 2016 by Anonymous

Quick physics help
you hear a thunder 4 seconds after you see the lightning. how far away is the storm?
Monday, May 16, 2016 by Anonymous

physics
If the sun's mass is about average, how many stars are there in the Milky Way galaxy? (This is all the information given in the question and I don't know where to go from here).
Monday, May 16, 2016 by Anonymous

physics
Two blocks are connected with a light string that is hung over a pulley, as shown in the diagram to the right. One block has twice the mass of the other, and the pulley has the same mass as the heavier block. The pulley consists of a solid, uniform circular disk. The heavier ...
Monday, May 16, 2016 by ChrismB

Mech. Engr./Dynamics/Physics/Math
A ball is dropped with a velocity v0 and an angle alpha with the vertical onto the top step of a flight of stairs consisting of 10 steps. The ball rebounds and bounces down the steps where the coefficient of restitution between ball and step is e=0.6. The friction between ball...
Monday, May 16, 2016 by Jay

Physics
A 56kg student runs at 5m/s, grabs a hanging rope, swings out over a lake. He releases the rope when his velocity is zero. The angl when he releases the rope is 29.25degrees. What is the tension in the rope just before he releases it? What is the maximum tension in the rope?
Monday, May 16, 2016 by Veronica

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.
Monday, May 16, 2016 by somay

physics
Two horizontal turntables are in contact with each other at their outer edges, and the static friction between them allows them to turn together (in opposite directions) without slipping. Thelarger turntable has a radius of 0.36m, and the smaller turntable a radius of 0.12m. ...
Monday, May 16, 2016 by ChrismB

physics
A rod of length L has a varying density along its length that satisfies: λ(x) =((x^2/L^2)+1)λo where x = 0 is one end of the rod (which has density λo), and x = L is the other end (which has density 2λo). a. Find mass of the rod in terms of L and λo. b...
Monday, May 16, 2016 by ChrismB

physics
Your roommate gives you a cylindrical can of peanut brittle, saying that she got it for free as a promotion at the grocery store,and that she doesn’t like it because it sticks to her teeth. Just as you are about to open it, you remember that it is April 1st,and you smell ...
Monday, May 16, 2016 by ChrismB

Physics
A 56kg student runs at 5m/s, grabs a hanging rope and swings out over a lake. He releases the rope when his velocity is zero. The length of the rope is 10m, what is the angle when he releases the rope? (The person swings from the centre to the right). What is tension in the ...
Monday, May 16, 2016 by Veronica

Physics
A 56kg student runs at 5m/s, grabs a hanging rope and swings out over a lake. He releases the rope when his velocity is zero. The length of the rope is 10m, what is the angle when he releases the rope?What is the tension in the rope just before he releases it? What is the the ...
Monday, May 16, 2016 by Veronica

Physics
A 56kg student runs at 5m/s, grabs a hanging rope and swings out over a lake. He releases the rope when his velocity is zero. The length of the rope is 10m, what is the angle when he releases the rope? (The person swings from the centre to the right).
Monday, May 16, 2016 by Veronica

Mech. Engr./Dynamics/Physics/Math
A ball is dropped with a velocity v0 and an angle alpha with the vertical onto the top step of a flight of stairs consisting of 10 steps. The ball rebounds and bounces down the steps where the coefficient of restitution between ball and step is e=0.6. The friction between ball...
Sunday, May 15, 2016 by Jay

Physics
A 1370-kg car is skidding to a stop along a horizontal surface. The car decelerates from 27.6 m/s to a rest position in 3.15 seconds. What is the frictional force that the skidding car experiences?
Sunday, May 15, 2016 by De'Andra

Physics
a westward force of 20 N acts on a 2.0 kg object moving eastward at 60 m/s for 2.0 s. What is the resulting velocity?
Sunday, May 15, 2016 by Dwaipayan

Physics
At time t=0 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 ...
Sunday, May 15, 2016 by Supansa

physics
A ball of mass 100 g travelling with a velocity of 100 m/s collides with another ball of mass 400 g moving at 50 m/s in the same direction. If they stick together, calculate: (i) their common velocity (ii) loss of enery and hence state the type collision involved. I had ...
Sunday, May 15, 2016 by somay

physics
Two spools with equal radii and equal masses are wound onto opposite ends of a massless string, the center of which is then hung over a massless, frictionless pulley, as in the diagram to the right. The spool on the left is a solid cylinder, while the one on the right is ...
Sunday, May 15, 2016 by ChrismB

physics
A circle is cut out of a uniform piece of plywood. How does the rotational inertia measured around a point on its outer edge compare with the rotational inertia about its central axis? a. The two rotational inertias are the same. b. The rotational inertia about its edge is ...
Sunday, May 15, 2016 by ChrismB

physics
A body thrown upward from ground covers equal distance in 4th and 7th second . With what initial velocity body was projected ?
Sunday, May 15, 2016 by omna

physics
at what attitude the value of g would become one forth than on the surface of the earth?
Sunday, May 15, 2016 by zoya

College Physics (need help asap)
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?
Sunday, May 15, 2016 by Patrick

physics
Weight of metal ball in air is 96N. when it immersed in water then its apparent weight is 72N. What is density of metal?
Sunday, May 15, 2016 by Akarsh Singh

physics
a light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. 8 complete oscillations are counted when the plate falls through 10cm. What is the frequency of the fork ?
Saturday, May 14, 2016 by please Help urgently

Physics
A net force of 20N acts on a 5kg object.Determine how far the object travels starting from rest to acquire a speed of 8m/s
Saturday, May 14, 2016 by Anonymous

Physics
'A push broom consists of a 1.70 metre long handle with mass with mass 0.825kg, with a 0.500m wide brush with mass 0.420kg attached to the end of the handle' 'Treating both the handle and the brush as thin rods, find the moment of inertia I of the broom about an ...
Saturday, May 14, 2016 by Cummins

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

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