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February 14, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

PHYSICS
A car is travelling at 60km/h when applies his brakes.If the car decelerates uniformly at 5.6m/s2,how far does the car go after the brakes are applied before coming to rest?
Monday, October 19, 2015 by HEJUMACLA

PHYSICS
A car of mass 1100kg starts from rest on a level road and reaches the speed of 50.4km/h in 10s. i)what is the magnitude of acceleration of the car in m/s2? i)How far did the car travel in this time?
Monday, October 19, 2015 by HEJUMACLA

Physics
An electron has an initial speed of 4.00×106 m/s. What potential difference (sign and magnitude) is required to bring the electron to rest?
Monday, October 19, 2015 by Rachel

PHYSICS
Michael stands upright and allows his right arm to swing back and forth, naturally and without forcing, like a pendulum. He measures the time for 29 oscillations (complete cycles) to be 38.6 s. Assume his arm (length L) behaves as a simple pendulum, with an effective length of...
Monday, October 19, 2015 by Caitlyn

Physics
A tennis ball is thrown up in the air. It stays there for 12.1 seconds how fast did you throw it?
Monday, October 19, 2015 by Anon

physics
A duck waddles 2.3m east and 7.0m north. what are the magnitude and direction of the ducks displacement with respect to its original position?
Monday, October 19, 2015 by bob

Physics 101 (I'm stupid)!
And Astronaut wearing an environment suit has a total mass of 130 kg. What is his weight on earth? What would his weight be on Mars where the acceleration of gravity is 3.26? What is his mass on Mars? Why? If he should end up adrift and deep space what what his mask be? Why?
Monday, October 19, 2015 by Haley

Physics 101
Calculate the increase in length of a 250.00 meter Long concrete bridge if its temperature increases from 10.0°C to 39.0°C? The coefficient of expansion of concrete is 9.8 X 10^-6 (1/°C)
Monday, October 19, 2015 by Haley

Physics
A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 8.60 cm. Through what arc length s does the 25.0-cm mark on the stick move? I have no clue what Im doing, I know S=tr but what is t?
Monday, October 19, 2015 by Ashley

Physics
A 20-kg child running at 1.4 m/s jumps onto a playground merry-go-round that has inertia 180 kg and radius 1.6 m. She is moving tangent to the platform when she jumps, and she lands right on the edge. Ignore any friction in the axle about which the platform rotates.
Monday, October 19, 2015 by Ethan

Urgent physics help
1. A runner starts at rest and accelerates uniformly at a rate of 0.85 m/s2 . What is the runner’s velocity after the runner has traveled 6.0 m? A. 2.3 m/s B. 3.2 m/s C. 5.1 m/s D. 10.2 m/s 2. An official drag race in the United States is usually 1/4 mile long, which is ...
Monday, October 19, 2015 by Anonymous

Physics
A child stands on a balcony directly above a friend 5.00 m below. Each throws a ball toward the other with the same initial speed of 10.0 m/s. If each catches a ball at the same instant, which child threw a ball first? How much later was the second ball thrown?
Monday, October 19, 2015 by Bob

Physics
A 1600 kg block of granite is pulled up an incline that has an angle of inclination θ = 20 ° with a constant speed of 1.21 m/s by a steam winch (see Figure). The coefficient of kinetic friction between the block and the incline is 0.09. How much power must be supplied...
Monday, October 19, 2015 by Julia

PHYsics URGENT
the deepest part of the ocean is 10,900 meters deep. a) calculate the absolute pressure at that depth in units N/m^2. Use the mass density of sea water, 1030 kg/m^3. see part b for more info b) one atmosphere of pressure is about 1.013 X 10^5 N.m^2. How many atmospheres is the...
Monday, October 19, 2015 by sammie

physics
how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule
Monday, October 19, 2015 by sammie

Physics
Michael Jordan has the record for the highest vertical jump at 48 inches (1.22m). While on the ground, he speeds up over a distance of 0.6 m to achieve the necessary launch speed. What acceleration does his legs provide in order to achieve his height? (Hint: you will need to ...
Monday, October 19, 2015 by Joseph

physics
a motorcycle initially moving at +32 m/s accelerates at -4.0 m/s for 3.0s. a car initially at rest accelerates at 4.0 m/s for 5.25 s. a) Which vehicle will be going faster at the end of each given time, and how much faster? b) how far does each vehicle travel during their ...
Monday, October 19, 2015 by melanie

Physics
I don't understand this at all! use the position equation s=-16t^2 +v0t+s0 to write a function that represents the situation. Find the average rate of change from t1 to t2. a) An object is thrown upward from a height of 6 feet at a velocity of 64 feet per second.... t1=0...
Monday, October 19, 2015 by Julia

Physics-E&M
8.1 Collision? A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a velocity ~v ⊥ B~ . A particle at rest with mass m and charge Q is on the path of the magnet. Assume that the magnet has a mass much larger ...
Monday, October 19, 2015 by Ryan

Physics
A bullet is fired from a rifle that is held 1.70 m above the ground in a horizontal position. The initial speed of the bullet is 1078 m/s. Calculate the time it takes for the bullet to strike the ground.
Monday, October 19, 2015 by Julia

Physics
two students working on physics assignment to find out how far window is from the roof of a building drop a ball over the edge of the roof the ball takes .1 seconds to travel from the top of the window to its bottom of a distance of 1 m assume the acceleration of gravity to be...
Monday, October 19, 2015 by Caroline

physics
vander waal b for oxygen is 32 cm3/mol compute the diameter of o2 molecule.
Monday, October 19, 2015 by abdulmueed

physics
Advantageous of 3pin plug over 2 pin plug
Monday, October 19, 2015 by question

physics
at what temprature is the average translational k.e of a molecule in an ideal gas equal to 1 ev?
Monday, October 19, 2015 by abdulmueed

physics
A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.35 m/s. Knowing that at the time of the release the balloon was 81.8 m above the ground, determine the time, τ, it takes the bag to reach the ground from the moment ...
Monday, October 19, 2015 by abby

Physics
In a downtown office building you notice each of the four sections of a rotating door has a mass of 85 kg. What is the width of each section of the door if a force of 62 N applied to the outer edge of a section produces an angular acceleration of 0.460 rad/s2?
Monday, October 19, 2015 by Destiny

Physics
A pitched ball is hit by a batter at a 40° angle and just clears the outfield fence, 106 m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. (Ignore air resistance)
Sunday, October 18, 2015 by Kyle

Physics
A crane lifts a 200kg load at a steady velocity.It takes 12s to raise the load through 60m. i) What is the power needed to lift the load if there is no friction? ii) What is the power needed if the friction force is constant at 170N?
Sunday, October 18, 2015 by Hejumacal

PHYSICS
Write down the ORDER OF MAGNITUDE for the numbers given: a)4.72*10^-7 b)8.65*10^4 C)7.59*10^-5
Sunday, October 18, 2015 by HEJUMACLA

PHYSICS
What is the force of attraction between two masses 5kg and 8kg at a distance of 60cm apart.
Sunday, October 18, 2015 by COSMAS

Physics
On a low-friction track, a 0.56-kg cart initially going at 1.85 m/s to the right collides with a cart of unknown inertia initially going at 2.17 m/s to the left. After the collision, the 0.56-kg cart is going at 1.32 m/s to the left, and the cart of unknown inertia is going at...
Sunday, October 18, 2015 by aleisha

Physics
Orville walks 330 m due east. He then continues walking along a straight line, but in a different direction, and stops 160 m northeast of his starting point. How far did he walk during the second portion of the trip and in what direction?
Sunday, October 18, 2015 by Michael

AP physics
A 65-kg skier starts at rest and slides 30 m down a hill inclined at 12∘ relative to the horizontal. Consider the force of friction on the skier to be negligible. Determine the speed of the skier after sliding 30 m downhill.
Sunday, October 18, 2015 by JAde

physics
A football is kicked with an initial velocity v=9i+12j. Find the speed in (m/s) of the ball after 2.4s A) 9.2 B) 10.8 C) 12 D) 15
Sunday, October 18, 2015 by HEMANT

Physics
A school boy walk 10 meter due west and afterward 15meter due south before reaching his school. Calculate the total distance and his displacement
Sunday, October 18, 2015 by Amos rejoice

physics
A piston of cross sectional area 100cm2 is used in hydraulic to exert a force of 10000000dyne find the cross area of another having weight 2000kg
Sunday, October 18, 2015 by question

Physics
A metal of block of mass 10kg lies on a rough plane, horizontal force of 8n applied to the block through it's centre of mass just slides the block on the plat form. What is the coefficient of limiting friction between the block and the plat form.
Sunday, October 18, 2015 by Akumka patricia

physics
In a phsics experiment, a 1.3 kg dynamics cart is placed on a ramp inclined at 25 degrees to the horizontal. the cart is initially at rest but is then pulled up the ramp with a force sensor. the force sensor exerts a force on the cart parallel to the ramp. negligible friction ...
Sunday, October 18, 2015 by tim

physics
from a roof top a rifle is fired with a steady blowing wind. The time interval between the flash and the report,observe at 1km away is 5seconds.find the velocity of sound in air
Sunday, October 18, 2015 by kings.

physics
suppose that the two person,each of mass 100kg are 3meter a part in outer space.what is the magnitude of the gravitational
Sunday, October 18, 2015 by abdu

Physics
Initially, a particle is moving at 4.00 m/s at an angle of 33.5 degrees above the horizontal. Two seconds later, its velocity is 6.45 m/s at an angle of 60.0 degrees below the horizontal. What was the particle's average acceleration during these 2.00 seconds? Enter the x ...
Saturday, October 17, 2015 by Hailey

physics heat flow problems.
b. Two metallic rods A and B with similar length and cross sectional area are joined together and all curved surfaces are insulated. At steady state, the temperatures at their ends are shown in the figure below. The thermal conductivity of A is twice that of B. Calculate the ...
Saturday, October 17, 2015 by mais

Physics
At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a question like this, ...
Saturday, October 17, 2015 by alyssa

Physics
A 2.9 kg brick has a kinetic coefficient of friction of 0.33. what force must be applied to the brick for it to move at a constant velocity? Show work
Saturday, October 17, 2015 by hamza

Physics
Ivan rides his motorcycle 4.5 times around a circular track that has a radius of 100 m a)what is the distance traveled and b)what is the displacement?
Saturday, October 17, 2015 by Isha

physics
An astronaut was working on the exterior of her spaceship tightening a bolt with her wrench. The astronaut and a spaceship both experience weightlessness and become separated from each other. Suggest a way in which the astronaut can use her knowledge of Newton's Laws to ...
Saturday, October 17, 2015 by Mike

physics
You are driving on a very long, very straight 2 lane road, stuck behind a lorry which travels at a constant 75 km/hour. You want to overtake the lorry, which has a length of 12.0 m. You car is 3.8 m long. To overtake the lorry, and to do this safely, you need to move to the ...
Saturday, October 17, 2015 by Physics

physics
You are driving on a very long, very straight 2 lane road, stuck behind a lorry which travels at a constant 75 km/hour. You want to overtake the lorry, which has a length of 12.0 m. You car is 3.8 m long. To overtake the lorry, and to do this safely, you need to move to the ...
Saturday, October 17, 2015 by Anonymous

Physics
A 72 kg skier leaves the end of a ski-jump ramp with a velocity of 24 m/s directed 25◦ above the horizontal. The skier returns to the ground at a point that is 14 m below the end of the ramp with a total speed of 22 m/s. (a) What is the rate at which the gravitational ...
Saturday, October 17, 2015 by Adam

physics
An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval? a.5.3 m/s2, upward b.2.0 m/s2, upward c.5.3 m/...
Saturday, October 17, 2015 by N

physics
a car accelerating from reast at 2m/s2 for 5s?..
Saturday, October 17, 2015 by ibrahim

Physics
A crate of mass 40 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 14 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...
Friday, October 16, 2015 by Noel

physics
A 82.0 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 314.0 N. The floor is rough with a coefficient of friction of 0.30. What is the final speed of the crate, in m/s, after it has been pulled a distance of 13.0 m?
Friday, October 16, 2015 by Anonymous

PHYSICS
A sprinkler mounted on the ground sends out a jet of water at a 20 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 11 m/s . How far does the water travel before it hits the ground?
Friday, October 16, 2015 by Meg

physics help
A block Q Of mass 70 kg is at rest on a table it is connected to block P By means two light inextensible strings knotted at S .A Third string is arranged in such a way that the string connecting block Q is horizontal. Calculate the maximum weight of block P for which block Q ...
Friday, October 16, 2015 by alex

Physics
A shell is fired from the ground with an initial speed of 1.60 × 103 m/s (approximately five times the speed of sound) at an initial angle of 43.0◦ to the horizontal. The acceleration of gravity is 9.81 m/s2 . a) Neglecting air resistance, find the shell’s ...
Friday, October 16, 2015 by Anonymous

Physics
A shell is fired from the ground with an initial speed of 1.60 × 103 m/s (approximately five times the speed of sound) at an initial angle of 43.0◦ to the horizontal. The acceleration of gravity is 9.81 m/s2 . a) Neglecting air resistance, find the shell’s ...
Friday, October 16, 2015 by Jessika

physics
A box containing food supplies for a refugee camp was dropped from a helicopter flying horizontally at a constant elevation of 414.1 m. If the box hit the ground at a distance of 95.3 m horizontally from the point of its release, ... a) what was the speed of the helicopter? b...
Friday, October 16, 2015 by sandy

Physics
If the rope pulling on the leg exerts a 120-N force on it, how massive should be the block hanging from the rope that passes over the pulley?
Friday, October 16, 2015 by Joseph

physics
An object is launched at a speed of 24.68 m/s from the top of a tall tower. The height y of the object as a function of the time t elapsed from launch is y(t) = –4.905 t2 + 18.01 t + 60.34, where y is in meters and t is in seconds. Determine: a) the height H of the tower;
Friday, October 16, 2015 by linda

Physics
Baseball player A bunts the ball by hitting it in such a way that it acquires an initial velocity of 2.0 m/s parallel to the ground. Upon contact with the bat the ball is 1.0 m above the ground. Player B wishes to duplicate this bunt, in so far as he also wants to give the ...
Friday, October 16, 2015 by Adrian

Physics
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end of the rifle...
Friday, October 16, 2015 by Adrian

Physics
A tennis ball is struck and departs from the racket horizontally with a speed of 28.6 m/s. The ball hits the court at a horizontal distance of 18.4 m from the racket. How far above the court is the tennis ball when it leaves the racket?
Friday, October 16, 2015 by Adrian

Physics
A skier launches off a ski jump with a horizontal velocity of 25.3 m/s (and no vertical velocity component). a) What is the magnitude of the horizontal component of her velocity the instant before she lands 1.95 s later? b) What is the magnitude of the vertical component of ...
Friday, October 16, 2015 by Mark

Physics
A model airplane has a mass of 0.95 kg and moves at a constant speed on a circle that is parallel to the ground. Assume that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. Find the ...
Friday, October 16, 2015 by James

Physics
A pilot, whose mass is 70.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 325 m/s and that the radius of the loop-the-loop is 5.922 km. What is the apparent weight that the pilot feels (i.e., the force with which the pilot presses ...
Friday, October 16, 2015 by Nick

physics
Two identical sources S1 and S2 are moving towards an observer P. The two sound sources S1 and S2 produce notes of frequency 500hz. If the speed of S1 and S2 are 20ms-1 and 23ms-1 respectively, calculate the beat frequency heard by P. (Speed of sound = 340ms-1) I don't ...
Friday, October 16, 2015 by shu yan

PHYSICS
The height of a tower is 25m. A stone is thrown upwards from the top of the tower at 20.5m/s. Calculate the total time the stone was in the air.
Friday, October 16, 2015 by MAMBA NP

Physics
Consider the equation v = (1/7)zxt2. The dimensions of the variables v, x, and t are [L/T], [L], and [T] respectively. The numerical factor 7 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions?
Friday, October 16, 2015 by Harry

physics
The drawing shows four point charges. The value of q is 1.4 μC, and the distance d is 0.86 m. Find the total potential at the location P. Assume that the potential of a point charge is zero at infinity
Friday, October 16, 2015 by Sarah

Physics
A sprinkler mounted on the ground sends out a jet of water at a 30 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 11 m/s . How far does the water travel before it hits the ground?
Friday, October 16, 2015 by raquel

Physics
When the motor in the figure below raises the m = 1010kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 78.9kgm^2 and a radius of 0.736m. The cable rides over the pulley without slipping. Determine ...
Friday, October 16, 2015 by Nora

physics
A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 180 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity relative to the ...
Thursday, October 15, 2015 by walter

Physics
A 63.7 kg skier encounters a dip in the snow's surface that has a circular cross section with radius of curvature of $r$ = 11.5 m. If the skier's speed at point A in the figure below is 7.87 m/s, what is the normal force exerted by the snow on the skier at point B? ...
Thursday, October 15, 2015 by Anonymous

Physics
In a glancing collision between two identical steel spheres, which of the following statements are correct? (Assume this collision is perfectly elastic. Select all that apply.) a) The velocities of the spheres after the collision in the direction perpendicular to the incoming ...
Thursday, October 15, 2015 by David

Physics
A steel ball rolls off a flat table of height 1.05 m with a velocity of 1.90 m/s a) How long will it take the ball after leaving contact with the table to hit the ground? b) How far from the edge of the table will the ball hit the floor?
Thursday, October 15, 2015 by David

physics
You throw a snowball at an angle of 34.0° below the horizontal from the roof of a building that is 74.0 m above flat ground. The snowball hits the ground a distance of 44.0 m from the base of the building. Assume free fall with up as positive, and use g = 9.80 m/s2. how ...
Thursday, October 15, 2015 by walter

physics
An object is launched at a speed of 15 m/s. If it rises to a height of 2 m, at what angle was it launched?
Thursday, October 15, 2015 by walter

Physics
If a rocket is launched at an initial speed of 120m/s at an angle of 25 degrees, find the time of flight, range, and it's highest height.
Thursday, October 15, 2015 by BN

physics
A 330 kg box rests on an adjustable ramp having s = 0.25. The angle on inclination of the ramp is increased until the box begins to slide. At what angle will the box begin to slide?
Thursday, October 15, 2015 by Sara

PHYSICS URGENT
While flying at an altitude of 7.25 km, you look out the window at various objects on the ground. If your ability to distinguish two objects is limited only by diffraction, find the smallest separation between two objects on the ground that you can resolve as distinguishable. ...
Thursday, October 15, 2015 by Kent

Physics
A 21 kg child swings on a playground swings 3.6 m long. What is period of her motion? 2) If her older brother, who weighs twice as much as she does, rides in the swing instead, what is the period of the motion? Assume the center of mass to be at the position of the seat in ...
Thursday, October 15, 2015 by Vishwajeet

Physics
A 5 g bullet has a speed of 300 m/s and embeds itself into a 500 g block. The block is initially at rest sitting on a rough surface which has a coefficient of kinetic friction equal to 0.5. A) What is the speed of the block after the collision? which is= 2.97 m/s B) What ...
Thursday, October 15, 2015 by Melissa

Physics
So if I have a rocket going to a certain height - I know its mass, and I know its total impulse, and the height it reaches -how do I calculate for another height? For example, 50Ns is total impulse, mass is 550g, and height is 750m. How do I calculate the impulse needed to ...
Thursday, October 15, 2015 by Enrique

science- physics
Two spheres are launched horizontally from a 1.1 m -high table. Sphere A is launched with an initial speed of 4.5 m/s . Sphere B is launched with an initial speed of 1.5 m/s . What is the distance that sphere A travels from the edge of the table? What is the distance that ...
Thursday, October 15, 2015 by Laura

Physics
A wire of length 2.00m and radius 1.0mm is stretched modulus for the wire
Thursday, October 15, 2015 by Blessing

AP Physics
Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. The coefficient ...
Thursday, October 15, 2015 by Brianna

physics
A motor car of mass 1200kg is moving along a straight line with a uniform velocity of 90km/h.itsmvelocity is slowed down to 18km/h in 4 s by an unbalanced external force.calculate th acceleration and change in momentum of the car . Also calculate the magnitude of force required.
Thursday, October 15, 2015 by piyush

Physics
What is the power of an engine that pulls a 1000kg automobile at a steady speed of 10m/s along a level road?
Thursday, October 15, 2015 by Arisha Aijaz Ali.

Physics
A 200 g block is pressed against a spring with a spring constant of 1.4 kN/m until the block compresses the spring by 10 cm. The spring rests at the bottom of a ramp inclined at θ = 60◦ to the horizontal. Determine how far up the incline the block moves (L) before ...
Thursday, October 15, 2015 by Mauricio

AP Physics
You are standing at the top of a cliff that has a stairstep configuration. There is a vertical drop of 6 m at your feet, then a horizontal shelf of 10 m , then another drop of 4 m to the bottom of the canyon, which has a horizontal floor. You kick a 0.49 kg rock, giving it an ...
Wednesday, October 14, 2015 by MJay

Physics
You are pulling handle of a wagon with a force of 270N. The handle makes an upward 35 degrees angle with the ground. The loaded wagon has a mass of 95kg. 1.what is the weight of the wagon? 2.How much of your applied force pulls the wagon forward? 3.what is the normal force ...
Wednesday, October 14, 2015 by Anonymous

physics
A 5 kg box is sitting on a table. Bob's hand is pushing down on the box with a 12 N force. Find the normal force on the box. (draw this)
Wednesday, October 14, 2015 by Beverly

physics
The force of gravity on a box is 597 N on the surface of the Earth. Find the mass of the box.
Wednesday, October 14, 2015 by Nicholis

physics
What are differences between nuclear fusion and nuclear fission?
Wednesday, October 14, 2015 by sujal

physics
What is voltage and electromotive force?
Wednesday, October 14, 2015 by sujal

AP Physics 1
In the javelin throw at a track-and-field event, the javelin is launched at a speed of 33 m/s at an angle of 32° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...
Wednesday, October 14, 2015 by Anonymous

physics
Why is voltmeter made of high resistance?
Wednesday, October 14, 2015 by sujal

physics
Why is voltmeter connected in parallel in electric circuit?
Wednesday, October 14, 2015 by sujal

physics
Sound wave with greater amplitude travels farther than that with smaller amplitude?
Wednesday, October 14, 2015 by sujal

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Homework Help: Science