Friday
April 29, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A box of mass M sits on a table and is connected by a rope passing over a smooth support to another box of mass m that hangs over the edge of the table. (a) What is the acceleration of M ignoring friction (b) and if the coefficient of kinetic friction between box and table is...
Thursday, February 25, 2016 by Supansa

Physics
old faithful geyser in yellowstone park shoots water hourly to a height of 44.8m. with what velocity does the water move when it is at 24.4m above the ground (on its way up)?
Thursday, February 25, 2016 by S

Physics
a block of mass 2kg moves on a frictionless inline (none of the forces on the block are shown). its initial velocity is v initial=3m/s, and it slides a vertical distance h=10m up the slope and its final velocity is v final=2m/s. find the external work done on the block.
Thursday, February 25, 2016 by S

Physics
a skier, mass 61 kg is at the top of a hill and starts down with an initial speed of 5m/s. he does no work on the way down, assume that the hill surface is frictionless. find his speed at the bottom of the hill which is 10m below the top.
Thursday, February 25, 2016 by S

Physics Grade12
two balls are juggled so that each ball is in the air for 1.800s, and the second ball is thrown up at the instant the first starts down. Find the height above the throwing hand where the two balls pass eachother, assuming gEarth=9.800m/s^2 I started with d=vt but we don't ...
Thursday, February 25, 2016 by Bridget

Physics
A 4.70 nC point charge is placed at the centre of a hollow metal sphere that has an inner radius 4.70 cm and an outer radius 17.6 cm. The metal sphere itself is charged to 8.40 nC. a)What is the magnitude of the electric field at a distance of 1.60 cm from the centre? b)What ...
Thursday, February 25, 2016 by Cindy

physics
A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 × 103 kilograms and an initial velocity of +20 meters/second. The car has a mass of 9.5 × 102 kilograms and an initial velocity of -26 meters/second. What is their total momentum after ...
Thursday, February 25, 2016 by bianca

physics
An astronaut has a mass of 60kg.what is her weight here on earth
Thursday, February 25, 2016 by eshal

Physics
A hose lying on the floor shoots a stream of water upward of an angle of 35 degrees with the horizontal. How high up will strike a building 7 m away if the nozzle velocity is 25m/s
Thursday, February 25, 2016 by Francis Gabriel

Physics
Determine the resultant displacement rising analytical method d1 = 400 km, E d2 = 200 km, 20 degrees W of S d3 = 280 km, N d4 = 350 km, 70 degrees E of S
Thursday, February 25, 2016 by Francis Gabriel

Physics
Find the range at an arrow that leaves a bow at 45 m/s at an angle of 50 degrees above the horizontal level.
Thursday, February 25, 2016 by Francis Gabriel

physics
A horizontal ,straight wire carying 12.0A current from west to east is in the earth's magnetic field B.At this place,B is parallel to the surface of the earth ,points to the north and its magnitude is 0.04mT.Determine the magnetic force on 1m length of the wire.If mass of ...
Thursday, February 25, 2016 by gourav bhardwaj

physics
what's the pressure change in water going from a 5.0cm diameter pipe to a 2.0cm diameter pipe if the velocity in the smaller pipe is 4.0m/s .
Thursday, February 25, 2016 by Nwabugwu

Physics,geo,life scince,pure maths,
Hy my name is pretty my schol name is mdingazi doing physics...i dont know what to do about the career i have choosen can u please help.
Thursday, February 25, 2016 by Pretty

Physics
Halley's Comet orbits the sun about every 75 years due to the gravitational force the sun provides. Compare the gravitational force between Halley's Comet and the sun when the Comet is at aphelion (its greatest distance from the sun) and d is about 4.5×10^12m the...
Thursday, February 25, 2016 by Dontworryaboutit

physics
A copper of mass 400g is heated until it's temperature becomes 250 degree celcius.it is dropped into water weighing 200g at 50 degree celcius.calculate the mass of water vapour produced.
Thursday, February 25, 2016 by christianah

physics
The energy of a capacitor is 4.0uJ after it has been charged by a 1.5v battery.calculate its energy when it is charged by a 6.0v battery.
Wednesday, February 24, 2016 by gourav bhardwaj

Physics
Looking down from a stationary tree branch, a merry-go-round spins in a counterclockwise direction with an angular velocity of 1 radian per second. a squirrel of mass 0.2 kg sits on the outer rim of the merry-go-round, at a radius of 2.0 meters. a) What is the magnitude and ...
Wednesday, February 24, 2016 by Anonymous

physics
Two particles carrying 4c and -2c charges are placed on 1m long straight wire.determine the point on the line joining these particles where the electric potential is zero with reference to the positively charged particle.
Wednesday, February 24, 2016 by gourav bhardwaj

Physics
A small marble is placed in the bottom of a large bowl. If the marble is given a small push it will oscillate back and forth about the bottom of the bowl, moving along a small arc with radius 0.50 m. Assuming the marble rolls without slipping what is the period of this ...
Wednesday, February 24, 2016 by Ashley

Physics
The axle of a solid wheel of mass M and radius R is attached to a horizontal spring of constant k as shown below. Derive and simplify an expression for the period of the wheel’s oscillation, assuming it rolls back and forth without slipping. Answer T= 2pi squrt(3M/2k)
Wednesday, February 24, 2016 by Ashley

Physics
A certain object of mass 0.50 kg moves along the x-axis. Its potential energy is given by U = 3x2 + 8x. Starting at rest, the object is released at the origin. (a) Find the maximum speed attained by the object. (b) Find the position about which it oscillates. (c) Find the ...
Wednesday, February 24, 2016 by Ashley

Physics
A car going 2 m/s is given a 50 m head start on another car that goes 20 m/s. How many meters will the slower car go until the faster car catches up?
Wednesday, February 24, 2016 by Cass

Physics Fluid Mechanics
HELP! a 650kg weather balloon is designed to lift a 4600kg package. what volume should the balloon have after being inflated with helium at 0°C and 1atm pressure to lift the total load? (hint. use the density value of helium) thanks!!
Wednesday, February 24, 2016 by KarryStyles

Physics
A 17 g bullet strikes and becomes embedded in a 1.20 kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.23, and the impact drives the block a distance of 8.6 m before it comes ...
Wednesday, February 24, 2016 by Jordan

PHYSICS
a block is given an initial velocity of 3 m/s up the 22 degree plane. A.) How far up will the plane go B.) How much time elapses before it returns to its starting point. IGNORE FRICTION A) I got 1.2m B.) I got 1.6s I'm confused on this question: Both questions I think go ...
Wednesday, February 24, 2016 by J

Physics
In the series circuit, if the current through R1 is 1.5 A, what is the current through R2? 1. Unable to determine 2. 1.5 A 3. 1 A 4. 0.5 A 5. 3 A
Wednesday, February 24, 2016 by Lee

physics- check this out
Jason while driving on Kukum highway at 70 m.s – 1 seeing the traffic light turn red, he applies the brake and comes to rest in a time of 2 seconds. What is his deceleration? Select one: a. -17.5 m.s – 2 b. -35 m.s – 2 c. 17.5 m.s – 2 d. 35 m.s – 2
Wednesday, February 24, 2016 by micky

Physics
A car going 7 m/s is given a 42 m head start on another car that goes 13 m/s. How many meters will the slower car go until the faster car catches up?
Wednesday, February 24, 2016 by Cass

physics-please answer
A coconut thrown horizontally at 20 m/s from the top of a hill 63 m high. How far from the base of the hill does the coconut hit the ground? Select one: a. 42 m b. 13 m c. 66 m d. 72 m
Wednesday, February 24, 2016 by ray

physics
Which of the following prefixes will multiply the unit by 1,000? Select one: a. Milli b. Mega c. Kilo d. Centi
Wednesday, February 24, 2016 by saky

Physics
The projectile launcher shown below will give the object on the right an inital horizontal speed of 9.40 m/s. While the other object will be dropped with no initial speed. The objects are initially 114 cm above the ground. What will be the difference in the speeds of the two ...
Wednesday, February 24, 2016 by Sarah

physics
Osmium is the densest metal on earth. It has a density of 22.61 g.cm–3. Which of the following best represents this density in kg.m–3?
Wednesday, February 24, 2016 by junior

physics
The volume, V, of an object is given as a function of time by equation Where t, is time. Assuming that the equation is dimensionally correct, which of the following is the correct representation of the dimensions for X, Y and Z? Select one: a. X = L Y = L .T – 1 Z = L . T...
Wednesday, February 24, 2016 by junior

physics
If Tomasi walks 10 meters due west and then 30 meters due east. What is the total displacement?
Wednesday, February 24, 2016 by junior

physics
ik I just asked one, but I have more A 314 g particle is released from rest at point A along the diameter on the inside of a frictionless, hemispherical bowl of radius 45 cm. The acceleration of gravity is 9.8 m/s2 . Calculate its gravitational potential energy at point A ...
Wednesday, February 24, 2016 by a

physics
A spring has a force constant of 554.1 N/m. Find the potential energy stored in the spring when the spring is a) stretched 4.35 cm from equilibrium. Answer in units of J. b) compressed 2.98 cm from equilibrium. Answer in units of J. c) unstretched. Answer in units of J. I did ...
Wednesday, February 24, 2016 by a

physics
A copper of mass 400g is heated until it's temperature becomes 250degree celcius. It is dropped into water weighing 200g at 50 degree celcius.calculate the mass of water vapour produced.
Wednesday, February 24, 2016 by christy

physics
city b is north of city a and the 400 mile trip by care takes 8 the cities are 320 miles apart in a straight line what is the velocity of a trip from city a to city b
Wednesday, February 24, 2016 by kanisha

Physics
Suppose you have a meter stick balanced at its midpoint on a fulcrum. Mass one is 25 g and is placed 20 cm from the balance point. Mass 2 is 35 cm from the balance point when the meter stick is horizontal. What is the mass of mass 2?
Wednesday, February 24, 2016 by Anonymous

physics of grade 11
Consider a simple pendulum consisting of a small marble of mass 10 g that can be onsidered a point mass suspended from the lower end of an inextensible string of length 80 cm and whose mass is negligible. The upperstring is connected to a fixed point O .The pendulum is shifted...
Wednesday, February 24, 2016 by angy

Physics
A 20.0 m long uniform beam weighing 800 N rests on walls A and B, as shown in the figure below.(a) Find the maximum weight of a person who can walk to the extreme end D without tipping the beam.(b) Find the forces that the walls A and B exert on the beam when the same person ...
Wednesday, February 24, 2016 by Sam

physics
three resistors are connected in parallel R1=10, R2=50, R3=25.what is the equivalent resistance
Wednesday, February 24, 2016 by suzy

Physics
A block of mass m1 = 3.5 kg sits on a rough, horizontal surface and is connected to a second mass m2 by a light string over a frictionless, massless pulley. The coefficient of kinetic friction between m1 and the surface is 0.41. If the acceleration of the system is 0.25m/s^2 ...
Wednesday, February 24, 2016 by Chel

Physics
A solid disk rotates in the horizontal plane at an angular velocity of 0.0653 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.156 kg·m2. From above, sand is dropped straight down onto this rotating disk, so ...
Tuesday, February 23, 2016 by Physic

Physics
A 50-kiligram block initially at rest on a flat, level and smooth surface is pulled by 6.0 Newton acting 37 degrees North above the horizontal. Find the normal force and acceleration of the block.
Tuesday, February 23, 2016 by Jay

Science
Physics question -A driver of a car travelling at 72km/h, applying brakes and accelerates uniformly in opposite direction at the rate of 5m/s2. How long will the car take to come into rest ? How far will the car covered a distance after applying bra
Tuesday, February 23, 2016 by Akki

PHYSICS
A light spring (k= 130 N/m) is compressed 15 cm between two masses (1.2 kg and 2.4 kg) on a frictionless surface. The system is released and the masses fly apart. Which mass will have the larger magnitude momentum? Why? Which mass will have more kinetic energy? What is the ...
Tuesday, February 23, 2016 by Camille

Physics
A car (1100kg) skids up a hill inclined at 6 degrees. Its initial speed is 20m/s and skids 50m before stopping. When it stops, how high is it above where it started? How much potential energy did it gain? How much energy was lost to friction? What is the force of friction (...
Tuesday, February 23, 2016 by Mary-Lynn

Physics
Water flows over a section of Niagara Falls at the rate of 1.3 × 106 kg/s and falls 49.8 m. How much power is generated by the falling water? The acceleration of gravity if 9.81 m/s^2.
Tuesday, February 23, 2016 by Spooby

Physics
A student weighing 673 N climbs at constant speed to the top of an 11 m vertical rope in 14 s. What is the average power expended by the student to overcome gravity?
Tuesday, February 23, 2016 by Spooby

physics
A boxcar of mass 3.21 x 10^4 kg is rolling south at 5.16 m/s when it collides and couples with another boxcar of mass 5.18 x 10^4 kg that is rolling north at 2.38 m/s. What is the velocity of the coupled boxcars after collision? Take north as positive and express your result ...
Tuesday, February 23, 2016 by lizbeth

PHYSICS ASAP PLEASE
A pellet (20g) is launched horizontally off a cliff (20m high) from a spring-loaded gun. The spring has constan k=1800 N/m and is compressed 0.10m before launch. How much kinetic energy does the pellet have just before it hits the ground? How fast will the pellet be going just...
Tuesday, February 23, 2016 by Daniel

Physics
An outfielder throws a 2.12 kg baseball at a speed of 114 m/s and an initial angle of 54.8 ◦ . What is the kinetic energy of the ball at the highest point of its motion?
Tuesday, February 23, 2016 by Spooby

Physics
Melvin pulls a sled across level snow with a force of 345 N along a rope that is 31◦ above the horizontal. If the sled moved a distance of 34.5 m, how much work did Melvin do?
Tuesday, February 23, 2016 by Spooby

Physics
A bike pump has a 2.3 cm diameter piston that can move a maximum length of 35 cm. How much work is done on the air in the pump if the initial pressure is 1 atm and the final pressure is 4.4 atm?
Tuesday, February 23, 2016 by Aly

Physics
An artillery gun on a battle ship is capable of launching a shell at a vertical velocity of 400 m/s. A target is 40 Km away and 500 m above the ground. what is the maximum range the target can be away from the gun if the target is 500 m above the ground?
Tuesday, February 23, 2016 by Abdul

Physics
A pellet (20g) is launched horizontally off a cliff (20m high) from a spring-loaded gun. The spring has constant k= 1800 N/m and is compressed 0.10m before launch. How much energy is stored in the spring before launch? If all that energy is transferred to the pellet, how fast ...
Tuesday, February 23, 2016 by Danielle

Spring Physics
A block of mass 3 kg is hung from a spring, causing it to stretch 9 cm at equilibrium. The 3 kg block is then replaced by a 4 kg block, and the new block is released from the position shown below, at which point the spring is unstretched.WHAT IS THE LENGTH OF THE SPRING AT ...
Tuesday, February 23, 2016 by Jennifer

physics
A boxcar of mass 3.21 x 10^4 kg is rolling south at 5.16 m/s when it collides and couples with another boxcar of mass 5.18 x 10^4 kg that is rolling north at 2.38 m/s. What is the velocity of the coupled boxcars after collision? Take north as positive and express your result ...
Tuesday, February 23, 2016 by lizbeth

Physics
When the body temperature drops, this has the effect of reducing the potential across the axonal membrane slightly. At a body temperature of 30°C, the potential difference experimentally measured concentration of Na+ ions inside the lipid bilayer is 10^18 NA+ ions/cm^3. a...
Tuesday, February 23, 2016 by Physics lover

Physics
We can physically model the axonal membrane (axolemma) as a parallel plate capacitor with dielectric in it. If the capacitance per unit area in F/m^2 is known, what single additional parameter needs to be measured in order to determine the dielectric constant k of the membrane...
Tuesday, February 23, 2016 by Physics lover

physics
A two-stage rocket moves in space at a constant velocity of 4800 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1290-kg upper stage is 5600 m/s in the same direction as before the ...
Tuesday, February 23, 2016 by Tara

physics
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 235 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +3.2 m/s relative to the shore, and then hops onto an identical floating log that is ...
Tuesday, February 23, 2016 by Tara

Physics
The figure shows an arrangement in which four disks are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 93.4 N on the wall to which it is attached. The tensions in the shorter cords are T1 = 61.4 N, T2 = 41.5 N, and...
Tuesday, February 23, 2016 by Nick

Physics
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 2.50 m. Two of the spheres have a mass of 4.40 kg each. The third sphere (mass unknown) is released from rest. Considering only the gravitational forces that ...
Tuesday, February 23, 2016 by K

Physics
A truck is moving away at 30 mph from a car moving towards the truck at 60 mph. If the truck emits a horn of frequency 500 Hz, what frequency does the driver of the car hear to 3 significant digits? how do i solve i know the answer is 519hz but how?
Tuesday, February 23, 2016 by Victor

physics
A snowball rolls of a roof by accident. The roof is sloped 40.0 o relative to the horizontal. The edge of the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof. Ignore air resistance. Coincidentally, there is a group of ...
Tuesday, February 23, 2016 by tom

physics
A physics professor moonlights as a daredevil jumping things on a motorbike. His next stunt will be to jump the oldman river on his motorcycle. The ramp is being built 100 m above the river and made an angle of 50.0 o relative to the horizontal. The landing ramp will be 60.0 m...
Tuesday, February 23, 2016 by tom

Physics
Tennis ball is struck at a speed of 6m/s horizontally. It departs from the racket at a vertical distance of 1.02m. How much time is needed for the ball to hit the ground? Thanks!
Tuesday, February 23, 2016 by Danniela

Physics
An electron travels at a uniform speed of 2.50 × 106 m/s toward the top of this page. It then enters a uniform magnetic field and experiences a maximum force of 5.15 × 10-8 N that points toward the right of the page. What is the magnitude of the magnetic field? ...
Tuesday, February 23, 2016 by Erin

Physics
P= 231fraction numerator f t asterisk times l b over denominator s end fraction t= 14.3s W= ?
Monday, February 22, 2016 by Brooke

Physics
A sphere of mass 85kg is 12m from a second sphere of mass 65kg. A)what is the gravitational force of attraction between them?
Monday, February 22, 2016 by Sam

Physics
Sally has a mass of 50.0kg and earth has a mass of 5.98X10^24kg. The radius of earth is 6.371x10^6m. A)What is the force of gravitational attraction between sally and earth? B)What is Sally's weight?
Monday, February 22, 2016 by Sam

Physics
you strike a huge spring at a speed of 30m/s while strapped in a steel cage. When you hit the spring with combined mass of 320kg it is compressed 9.0m. A) What is the spring constant of the spring? B) How long are you in contact with the spring before it bounces off in the ...
Monday, February 22, 2016 by Sierra

Physics
So you chose to use a solid sphere and you give it a speed of 5.9m/s on a flat horizontal surface which is the speed it has when it reaches a 22degree incline. A) How far along the incline will it go?
Monday, February 22, 2016 by Sierra

physics
Two railroad freight cars with masses 110 Mg and 150 Mg approach with equal speeds of 0.310 m/s . They collide, the lighter car rebounding opposite its original direction at 0.270 m/s. Find the velocity of the heavier car after the collision. Assume the original direction of ...
Monday, February 22, 2016 by lizbeth

physics
Can the sun expand
Monday, February 22, 2016 by TRIX

physics
Drag race tires in contact with an asphalt surface probably have one of the higher coefficients of static friction in the everyday world. Assuming a constant acceleration and no slipping of tires estimate the coefficient of static friction for a drag racer that covers the ...
Monday, February 22, 2016 by Jade

Physics
At 6400 km above the earth’s surface, an object weighing 71 N on the surface would weigh only 18 N. Acceleration due to gravity will be about ¼ that on the surface of the earth.
Monday, February 22, 2016 by Joaquin

physics
a conductor is 2m long and 8mm diameter if its resistivity is 1.8*10^-8 ohmm calculate a,the resistance of the conductor b,the current in the conductor when a p.d of 10v is maintained across its ends c,the current density d,the electric field in the wire
Monday, February 22, 2016 by sol

physics
a rectangular box of mass 400g has a diameter 20cm by 10cm by 5cm compute the pressure it exerts on each face of the box when it rests on a table take g=10m/s2
Monday, February 22, 2016 by gelila

physics
A man tries to push a crate of 8kg across a rough surface. The static friction coefficient is 0.6 and the kinetic friction coefficient is 0.4. Calculate the friction force exerted on the crate if: a) a horizontal force of 45 N is exerted on the crate and b) a horizontal force ...
Monday, February 22, 2016 by Stressed out

physics
a wire has a resistance of 6 ohm it is stretched out to a new length which is three times its original length what is the resistance of the longer wire?assume uniform diameter.resistivity and density are constant
Monday, February 22, 2016 by mat

physics
a 50 kg astronautejects 100 g of gas from his propulsion pistol at a velocity of 50 m/s. what is his resulting velocity?
Monday, February 22, 2016 by kyla

Math/Physics
I am unsure of what exactly I am looking for in this problem... One of the highlights of the Calaveras Fair, besides the bullfrog jumping contest, is the watermelon seed spitting contest. The seed spitting is being done in the direction of s ⃗=5i ⃗+j ⃗. The ...
Monday, February 22, 2016 by Wendy

Physics 20
A 90.3 cm long pendulum is released from a vertical height of 20 cm and is allowed to swing freely. Determine the greatest speed of the pendulum.
Sunday, February 21, 2016 by Anonymous

Physics
A stone is thrown 60 degrees below the horizontal at 22 ft/sec and 20 meters above the ground. Using the energy equations, determine its velocity when it hits the ground.
Sunday, February 21, 2016 by Matt

physics
A charge +q is at the origin. A charge -2q is at x = 1.70 m on the +x axis.
Sunday, February 21, 2016 by Anonymous

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...
Sunday, February 21, 2016 by john

physics 12U
A driver parks his car on a hill but accidently leaves it in neutral. The car starts from rest and accelerates down the 45 m long hill. It take the car 12.3 seconds to reach the bottom of the hill. a) What is the final velocity of the car at the bottom of the hill? (ANS: 7.3 m...
Sunday, February 21, 2016 by emma

physics
A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at each of the three ...
Sunday, February 21, 2016 by mary

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...
Sunday, February 21, 2016 by john

physics
A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.355. (a) When the truck accelerates forward, what force accelerates the box? the inertial force centripetal force the friction force gravity (b) Find the maximum ...
Sunday, February 21, 2016 by john

physics
A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ...
Sunday, February 21, 2016 by john

physics
A physics professor moonlights as a daredevil jumping things on a motorbike. His next stunt will be to jump the oldman river on his motorcycle. The ramp is being built 100 m above the river and made an angle of 50.0 o relative to the horizontal. The landing ramp will be 60.0 m...
Sunday, February 21, 2016 by tom

physics
A snowball rolls of a roof by accident. The roof is sloped 40.0 o relative to the horizontal. The edge of the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof. Ignore air resistance. Coincidentally, there is a group of ...
Sunday, February 21, 2016 by tamara

physics
A boat is inclined upwards at 30 to the horizontal. the tension of the string is 200N. what is the force tending to raise the boat out of water.
Sunday, February 21, 2016 by anointed

physics
Three point charges, +6.5 μC, +1.8 μC, and −3.4 μC, lie along the x-axis at 0 cm, 1.7 cm, and 5.4 cm, respectively. What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is 8.99 × 109 N · m2...
Sunday, February 21, 2016 by anonymous

Physics
You often see birds resting on power lines that carry currents of 48 A. The copper wire on which the bird stands has a radius of 1.5 cm. Assuming that the bird's feet are 3.3 cm apart, calculate the potential difference across its body.
Sunday, February 21, 2016 by Physics lover

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