Thursday
August 25, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
an aluminum cylinder, of height h=2ocm and of radius r=1ocm, rests with its base on a horizontal table. Density of aluminum P=2700kg/m^3 a-calculate the weight of the cylinder take g=10N/kg b-what is the value of the force exerted by the table on the cylinder? c-deduce the ...
Wednesday, January 20, 2016 by julia

Physics
A fighter plane is directly over an anti aircraft gun at a time t=0. The plane has a speed of 600km/hr. A shell is fired from an anti aircraft gun at the time t=0, in order to hit the plane. The muzzle velocity V is 1100m/s. Determine the distance the gun should be aimed ahead...
Wednesday, January 20, 2016 by Gabriel

physics
A monkey standing on the ground wants to climb to the top of a vertical pole 13m tall.he climbs 5m to 1seconds and slips downward 3m in the next 1seconds..he again climbs 5m in 1sec ANd slips by 3m in the next second and so on..draw the x-t graph of his motion and hence find ...
Wednesday, January 20, 2016 by kaycee

Physics...please help me out..
A body of mass 7.5kg is to be pulled up along a plane which is inclined at 30degree to the horizontal. If the efficiency of the plane is 75 %, what is the minimum force required to pull the body up the plane?
Wednesday, January 20, 2016 by Angela

physics
an enemy plane is flying horizontally at an altitude of 2.0Km,with a speed of 3.0m/s.an army man with a gun on the ground sights the enemy plane and fires a shell with a muzzle speed of 600m/s when d plane Is directly overhead.at what angle to the ground should the plane be ...
Wednesday, January 20, 2016 by kaycee

Physics
A body of mass 7.5kg is to be pulled up along a plane which is inclined at 30degree to the horizontal. If the efficiency of the plane is 75%,what is the minimum force required to pull the body up the plane?
Tuesday, January 19, 2016 by Angela

Physics - Repost because of no response
1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
Tuesday, January 19, 2016 by Chanz

physics
A cue ball (mass = 0.145 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick, which applies an impulse of +1.45 N · s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of ...
Tuesday, January 19, 2016 by Isabelle

Physics
A machine of efficiency 80% is used to raise a load of body of mass 75kg through a vertical height of 3m in 30seconds.Calculate the power input.
Tuesday, January 19, 2016 by Angela

Physics
A simple machine with an efficiency of 75% lift of a load of 5000N.When a force of 500N is applied to it,Calculate the velocity ratio of the machine.
Tuesday, January 19, 2016 by Angela

Physics
work done by 975 kilograms from 25 m/s to 65 m/s
Tuesday, January 19, 2016 by Jimmy

Physics - Am I correct?
1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
Tuesday, January 19, 2016 by Chanz

physics
A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.9 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other words, what is the distance d ...
Tuesday, January 19, 2016 by DEMETRIUS

physics
a car is uniformly decelerated from 90km/hr in a time of 10 sec calculate the 2 acceleration
Tuesday, January 19, 2016 by wonde

PHYSICS
How can tachyons increase in speed by decreasing in energy
Tuesday, January 19, 2016 by TRYSYENS

Physics
A solid is completely submerged in a particular liquid and floats at a constant level.when the temperature of the liquid in the solid is raised, the liquid expands more than the solid. will this make the solid rise upward remain floating or sink explained
Tuesday, January 19, 2016 by Christine

Physics
An automobile with a mass of 1450 kg is parked on a moving flatbed railcar; the flatbed is 1.50 m above the ground. The railcar has a mass of 38500 kg and is moving to the right at a constant speed of 8.70 m/s on a frictionless rail. The automobile them accelerates to the left...
Tuesday, January 19, 2016 by Khalid

Physics please help
The gun, mount, and train car of a railway had a total mass of 1.22 x 10^6 kg. The gun fired a projectile that was 80 cm in diameter and weighed 7502 kg. In the firing, the gun has been elevated 20 degrees above the horizontal. If the railway gun at rest before firing and ...
Tuesday, January 19, 2016 by Khalid

physics
an ideal gas occupies a volume of 22.4litres at stp while absorbing 2.53KJ of heat from the surrounding the gas expands isobarically to 32.4 litres. What is the change in internal energy
Tuesday, January 19, 2016 by jay

Physics (Feilds)
Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.
Tuesday, January 19, 2016 by Sarah

Science(physics)
A spring 20cm long is stretched to 25cm by a load of 50N. What will be its length when stretched by 100N assuming that the elastic limit is not reached? I want the answer abd solving to this question and also the formula for young modulus of elasticity
Tuesday, January 19, 2016 by Rachel

Algebra
Math club purchased 3 adult tickets and 12 student tickets for $262.50. Physics club purchased 4 adult tickets and 8 student tickets for $230.00. How much do the adult and student tickets cost?
Tuesday, January 19, 2016 by bill

physics
Mary weighs 519 N and she walks down a flight of stairs to a level 3.4 m below her starting point. What is the change in Mary’s potential energy? Answer in units of J.
Tuesday, January 19, 2016 by Issa

Physics
1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
Monday, January 18, 2016 by Ryback

physics
A stick is a connection of two same -diameter metal rod 5 cm , and a length of both stick is 0,6m. The thermal conductivity of the first rod 92 cal /s.m.°C , and the second stick 50 cal / s.m.°C . The temperature at the free end of the first rod 100 °C and the free...
Monday, January 18, 2016 by Anonymous

physics
Bailey is on the tenth frame of her recent bowling competition and she needs to pick up the last pin for a spare and the first place trophy. She rolls the 7.05-kg ball down the lane and it hits the 1.53-kg pin head on. the ball was moving at 8.24 m/s before the collision. The ...
Monday, January 18, 2016 by bryce

Physics
the distance of a planet from its sun is 19000000 miles. if there are 29400000 seconds in one orbit, find the speed of the planet in its orbit about the sun. (assume a circular orbit)
Monday, January 18, 2016 by S

physics
The energy of the em waves is of the order of 15 kev.to which part of the spectrum does it belong?
Monday, January 18, 2016 by Princy

Physics
Also got lost on this question: A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below. If the plane is traveling horizontally with a speed of 250 km/h (69.4 m/s), (a) how far in advance of the recipients (horizontal distance) must the ...
Monday, January 18, 2016 by LINA

Physics
I'm having trouble where to start with this question.. Any help would be helpful. A projectile is fired with an initial speed of 75.2 m/s at an angle of 34.5° above the horizontal on a long flat firing range. Determine (a) the maximum height reached by the projectile...
Monday, January 18, 2016 by LINA

Physics
I did the problem but i'm confused on what to do next: 1.A hunter aims directly at a target (on the same level) 120m away. (a) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? (b) At what angle should the gun be aimed so the target ...
Monday, January 18, 2016 by LINA

Physics
How many coulombs pass through a wire that carries a current of 3.2 A for 5.0 h? I=Q/t Q=It Q=3.2*5*60 Q=960 I am told this is not the correct answer.
Monday, January 18, 2016 by R

Physics
A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?
Monday, January 18, 2016 by Isaac

Physics
Vehicle A is 819.017 feet behind vehicle B. Vehicle A is traveling at 93.602fps and vehicle B is traveling at 44fps. How long until vehicle A catches vehicle B?
Monday, January 18, 2016 by Wayne

ap physics
Mass m1 on the frictionless table of the figure below is connected by a string through a hole in the table to a hanging mass m2. With what speed must m1 rotate in a circle of radius r if m2 is to remain hanging at rest? (Use any variable or symbol stated above along with the ...
Monday, January 18, 2016 by ian

AP Physics
A 25 degree incline sits on a 1.2 meter high table. a ball rolls off the incline with a velocity of 4 m/s. how far does the ball travel across the room before reaching the floor?
Monday, January 18, 2016 by Kat

Physics
A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?
Monday, January 18, 2016 by Isaac

Physics
Vehicle A is traveling at 93.602fps and is 819.017 feet behind vehicle B. Vehicle A takes 8.75 seconds to overtake vehicle B. How fast is vehicle B traveling?
Monday, January 18, 2016 by Wayne

Physics
The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of the axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 0.97 m long, and the nerve impulse speed is 20.0 m/s, how long ...
Monday, January 18, 2016 by Bec

Physics
A 10.5 g bullet is fired into a 104 g wooden block initially at rest on a horizontal surface.The acceleration of gravity is 9.8 m/s2. After impact, the block slides 6.66 m before coming to rest.If the coefficient of friction between block and surface is 0.658 , what was the ...
Monday, January 18, 2016 by Luhan

physics momentum
a trolley of mass 200kg is travelling north at 2m\s. It collides head on with a second trolley of mass 500kg which is travelling south with a velocity of 5 m\s and they remain coupled together. a)calculate the velocity of the two trolleys after collision. b)what is the ...
Monday, January 18, 2016 by anna

physics
8. The coefficient of static friction between a 150-kg box of medical equipment and the floor is 0.35. Would 450-N force applied horizontally be enough to cause the box to move from rest?
Monday, January 18, 2016 by george

Physics
A bullet is fired horizontally with a velocity of 40m/m from the top of a building 50m height.How far from the foot of the building will the bullet be assumed to touch the ground?
Monday, January 18, 2016 by Gbenga

Physics
A CsCl (cesium chloride) salt crystal is built from the unit cells shown in the figure below. Cl− ions form the corners of a cube and a Cs+ ion is at the centre of the cube. The edge length of the cube, which is called the lattice constant, is 0.4 nm. (a) What is the ...
Monday, January 18, 2016 by Michel

Physics
We study three point charges at the corners of a triangle. Their charges are q1 = +4.0 10-9 C, q2 = −2.5 ✕ 10−9 C, and q3 = +5.0 10-9 C. Two distances of separation are also given, ℓ12 = 6 m and ℓ13 = 9 m. Find the net electric force on q3 1- ...
Monday, January 18, 2016 by Michel

Physics
A piece of cobalt has a mass of 41 g and is initially electrically neutral. It is then charged with q = +0.6 µC. (a) How many electrons were removed from the piece of cobalt in the charging process (in electron) (b) What fraction of the total number of electrons in the ...
Monday, January 18, 2016 by Shane

Physics
Determine the magnitude of the force between an electric dipole with a dipole moment of 2 ✕ 10-29 C m and an electron. The electron is positioned r = 25nm from the centre of the dipole, along the dipole axis. Hint: Assume that r >> d, with d the charge separation ...
Monday, January 18, 2016 by Shane

Physics
Three positive point charges are located at the corners of a rectangle. Find the electric field at the fourth corner if q1 = 5 nC, q2 = 6 nC, and q3 = 7 nC. The distances are d1 = 0.6 m and d2 = 0.2 m. (Let the positive x-direction be to the right, and the positive y-direction...
Monday, January 18, 2016 by Eric

Physics
A rocket moves upward, starting from rest with an acceleration of 34.4 m/s2 for 4.40 s. It runs out of fuel at the end of the 4.40 s but does not stop. How high does it rise above the ground?
Monday, January 18, 2016 by Cheyenne

physics
a ball rolls off the edge of a horizontal at 10m/s, what is the speed of the ball 2s later?
Sunday, January 17, 2016 by ann

AP Physics
A horizontal force of 160 N is used to push a 49.0 kg packing crate a distance of 7.00 m on a rough horizontal surface. The acceleration of gravity is 9.81 m/s If the crate moves with constant velocity, calculate the coefficient of kinetic friction.
Sunday, January 17, 2016 by lili

Physics
A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.3 km; angle of launch = π/3; landing height = launch height. What is the initial ...
Sunday, January 17, 2016 by Anonymous

Physics
A 26-lb. force vector that makes an angle of 101° counterclockwise from the -y direction. Determine the x and y components of the following three vectors in the xy plane.
Sunday, January 17, 2016 by Cristiano

Physics
Two identical massless springs are hung from a horizontal support. A block of mass 3.2 kg is suspended from the pair of springs.The acceleration of gravity is 9.8 m/s^2. When the block is in equilibrium, each spring is stretched an additional 0.32 m.The force constant(k) of ...
Sunday, January 17, 2016 by Johnathon

Physics
A 10.5 g bullet is fired into a 104 g wooden block initially at rest on a horizontal surface.The acceleration of gravity is 9.8 m/s2. After impact, the block slides 6.66 m before coming to rest.If the coefficient of friction between block and surface is 0.658 , what was the ...
Sunday, January 17, 2016 by Bri

Physics
The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each mass ...
Sunday, January 17, 2016 by Briana

Physics
The pilot of an airplane traveling 160 km/h wants to drop supplies to flood victims isolated on a patch of land 160m below. The supplies should be dropped how many seconds before the plane is directly overhead?
Sunday, January 17, 2016 by Lilly

physics
Where did the waste energy go to? A ball rolls off the ramp on the edge of a table heading downward and hits the ground. Was the energy lost or gained a direct relation to the distance that the metal ball travelled along the ramp?
Sunday, January 17, 2016 by Matt Damon

physics
What is the uncertainty of a physics lab? What does uncertainty mean? Let's say I'm measuring a height of where the ball is on the ramp and let go of the ball and the ball hits the ground and we use our eyes to see how far the ball lands from the ramp next to another ...
Sunday, January 17, 2016 by Matt Damon

Physics
Two forces of 5n and 7n respectively act an object.What is the maximum and minimum resultant of the two forces.Draw a diagram to show the minimum and maximum resultants.
Sunday, January 17, 2016 by Millicentina

physics
A 2.4 nC charge is at the origin and a -5.6 nC charge is at x = 1.0 cm . a)At what x-coordinate could you place a proton so that it would experience no net force? b)Would the net force be zero for an electron placed at the same position?
Sunday, January 17, 2016 by jak

Physics
You are required to produce two generalizations: (a) the average weight of a hen’s egg and (b) the average weight of a classroom chalk. You want your conclusion to be as systematic as possible with a limited time and with limited materials. How would the two ...
Sunday, January 17, 2016 by Edge

Physics
I'm confused on where to start. Can someone help break it down. That would be so helpful. 1.) an athlete executing a long jump leaves the ground at a 30° angle and travels 7.80 m. What was the takeoff speed? If this speed were increased by just 5.0 Percent, how much ...
Sunday, January 17, 2016 by Jake

Physics
The diameter of our disk-shaped galaxy, the Milky Way, is about 1.7E+5 light-years (ly). The distance to the Andromeda galaxy, which is the spiral galaxy nearest to the Milky Way, is about 1.9E+6 ly. If a scale model represents the Milky Way and Andromeda galaxies as dinner ...
Sunday, January 17, 2016 by sarah

Physics
A piece of copper ball of mass 20 gram at 200 degree celcius is place in a copper calorimeter of mass 60 gram containing 50 grm of water at 30 degree celcius, ignoring heat loses calculate the final steady temperature of the mixture. ( S. H. C of water is 4200j/kgk )
Sunday, January 17, 2016 by Anonymous

physics
Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between the speakers, along ...
Sunday, January 17, 2016 by dani

Physics/astronomy
How many different photons (photons of different frequencies) can be emitted as a hydrogen atom in the fifth excited state falls back directly or indirectly to the ground state?
Sunday, January 17, 2016 by Linsey

physics
Can water be boiled without heating?
Sunday, January 17, 2016 by Anjali

Physics
Calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one where s=0.072N/m.
Sunday, January 17, 2016 by Anjali

physics
a rain drop of radius 0.3mm has a terminal velocity in air 1m/s. the viscosity of air is 18×10^-5 dyne cm^-2 s. find the viscous force on the rain drops in newton.
Sunday, January 17, 2016 by Anjali

physics
calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where S=0.072N/m
Sunday, January 17, 2016 by Anjali

physics
calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where s=0.072N/m.
Sunday, January 17, 2016 by anjali

PHYSICS
AN OBJECT OF HEIGHT 5 CM IS PLACED PERPENDICULAR TO THE PRINCIPAL AXIS OF A CONCAVE LENS OF FOCAL LENGTH 10 CM .IF THE DISTANCE OF THE OPTICAL CENTRE OF THE LENS ES 20 CM .DETERMINE THE POSITION ,NATURE AND SIZE OF THE IMAGE FORMED USING THE LES FORMULA.
Sunday, January 17, 2016 by Anonymous

Physics
Where did the waste energy go to? A ball rolls off the ramp on the edge of a table heading downward and hits the ground.
Sunday, January 17, 2016 by The Real Matt Damon

Physics
How does the weight of a body varies on earth surface?
Saturday, January 16, 2016 by Shayo

Physics
Plot a velocity time graph of a motorcycle that accelerates from rest for 10 secs upto a velocity of 20 m/s . It maintains this velocity for a further 20 secs and then retards so that it stops in 20 secs
Saturday, January 16, 2016 by Usakahyel

pure maths, agriculture,life sciences, physics
i want to know what does those subject i choose fall under which career
Saturday, January 16, 2016 by ashley

physics
An enemy plane is flying horizontally at an altitude of 2.0km with a speed of 340m/s.An army man with anti-craft gun on the ground sight the enemy with a muzzle speed at 60m/s .when the enemy plane is directly overhead.find a)at what angle from the verticals should the gun be ...
Saturday, January 16, 2016 by henro

Physics
A burglar's car in operation alone townA has a start with an acceration of 2m/s^2. A police van came after 5sec and continue to chase the burglar's car wit uniform velocity of 20m/s.find the time take in which the police patroj van will overtake the burglar's car.
Saturday, January 16, 2016 by Henry1

Physics
A wave travels a distance of 60cm in 3s. The distance blw successive crests of thd wave is 4cm. What is the frequency?
Friday, January 15, 2016 by Celdrick

Science (physics)
How does temperature affect the gas in a balloon?
Friday, January 15, 2016 by Abby

AP Physics 1
1. A delivery truck travels 21 blocks north, 16 blocks east, and 26 blocks south. What is its final displacement from the origin? Assume the blocks are equal length. 2. Vector V1 is 6.6 units long and points along the negative x axis. Vector V2 is 8.5 units long and points at...
Friday, January 15, 2016 by Vikram

PHYSICS
Why do tachyons increase in speed by decreasing in energy
Friday, January 15, 2016 by TRYSYENS

PHYSICS
Can light accelerate,explain,THANK YOU
Friday, January 15, 2016 by TRYSYENS

Physics
A popular amusement park ride, shown on WB p. 8, operates as follows: riders enter the cylindrical structure when it is stationary with the floor at the point marked "a". They then stand against the wall as the cylinder then begins to rotate. When it is up to speed, ...
Friday, January 15, 2016 by Cora

physics
A tiger leaps horizontally from a 5.7 m high rock with a speed of 3.9 m/s. How far from the base of the rock will she land?
Friday, January 15, 2016 by Anonymous

physics
A 550.27 N force is moving a 396.46 kg block at a constant velocity across a wooden plank. What is the kinetic friction force?
Friday, January 15, 2016 by Anonymous

physics
A 550.27 N force is moving a 396.46 kg block at a constant velocity across a wooden plank. What is the kinetic friction force?
Friday, January 15, 2016 by zack

physics
A 19.62 kg block is sliding down a 34.52 degree incline at a constant velocity. What is the mu k of kinetic friction between the incline and the block?
Friday, January 15, 2016 by zack

Physics
A 543-N physics student stands on a bathroom scale in an 805-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 473 N A) Find the magnitude of the acceleration of the elevator.
Friday, January 15, 2016 by Mohamed

physics
a book accidentally falls from a shelf 4.2 m high.a librarian is standing nearby and moves .80m,starting from rest, to catch the book.what must be his average acceleration if he catches the book when it is 1.8m above the floor?
Friday, January 15, 2016 by ana

Physics
A cat can move at 1ms it wants to get straight across a 2m wide sidewalk moving left at .5 ms what angle should the cat direct itself
Friday, January 15, 2016 by Anonymous

mec113 or physics
(1)what is welding (2)what are the advantage and disadvantage of welded point (3)list and explain the various types of joint normaly used in welding (4)what do you understand by welding (5)list out the equipment required for oxy-acetylene welding (6)discribe with the aid of ...
Friday, January 15, 2016 by YAKUBU

Physics
A boy throws a rock with an initial velocity of 1.67 m/s at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory? Vi = 1.67 sin 30 = 0.835 m/s v = Vi - 4.9 t v = 0 0 = 0.835 - 4.9 t ...
Friday, January 15, 2016 by Anonymous

Physics
If the substance of 1kg mass is converted completely into energy then how many kilowatt energy will be produced?
Thursday, January 14, 2016 by Akhter

Physics
An 89.5 kg fullback moving east with a speed of 5.7 m/s is tackled by a 81.5 kg opponent running west at 2.58 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate the decrease in kinetic energy during...
Thursday, January 14, 2016 by Help please

physics
the sidewalk moves left at 0.5 m/s. it is 2m long. a cat runs a 1m/s and it wants to run straight across to get to its food. at what angle should the cat direct itself? and how long would the cat take to cross the sidewalk
Thursday, January 14, 2016 by dude please

Conceptual Physics
A paperback is 106mm in width. What is the width in centimeters? In meters? (I need to see this in steps)
Thursday, January 14, 2016 by Sonya

Physics
You have two tuning forks. One is a known frequency of 200 Hz. The second for his plate, there is a big frequency of five beats per second. What a piece of gum is placed on the second fork, the frequency increases three beats per second. What is the frequency of the second ...
Thursday, January 14, 2016 by Caroline

Physics
Ive tried numerous methods, but I cant seem to get this right. Please help, and explain step by step. An object's position is given by x=bt+ct^3, where b=1.50m/s and c=0.640m/s3. To study the limiting process leading to the instantaneous velocity, calculate the object'...
Thursday, January 14, 2016 by Ronnie

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Homework Help: Science