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September 22, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
Two ropes pull on a ring. One exerts a 63 N force at 30.0°, the other a 63 N force at 60.0° (a) What is the net force on the ring? Magnitude ____ N Direction ____ ° (b) What are the magnitude and direction of the force that would cause the ring to be in equilibrium?
Tuesday, February 11, 2014 at 9:33am

Physics
A street lamp weighs 150 N. It is supported by two wires that form an angle of 140° with each other. The tensions in the wires are equal. (a) What is the tension in each wire? (b) If the angle between the wires is reduced to 110°, what is the tension in each wire?
Tuesday, February 11, 2014 at 9:33am

Physics
An trunk weighing 518 N is resting on a plane inclined 25° above the horizontal. (a) Calculate the magnitude of the acceleration of the trunk (ignore friction). (b) After 6.00 s, how fast would the trunk be moving?
Tuesday, February 11, 2014 at 9:32am

physics
A 2.6 kg block slides down a 25° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity is 0.75 m/s. The incline is 1.6 m long. (a) What is the acceleration of the block? (b) What is the coefficient of friction?
Tuesday, February 11, 2014 at 9:32am

Physics
A 180 N box is placed on an inclined plane that makes a 30.0° angle with the horizontal. Find the component of the weight force parallel to the plane's surface.
Tuesday, February 11, 2014 at 9:31am

Physics
An object in equilibrium has three forces exerted on it. A 36 N force acts at 90° from the x axis and a 40 N force acts at 60°. What are the magnitude and direction of the third force?
Tuesday, February 11, 2014 at 9:31am

physics
Five forces act on an object. (1) 57 N at 90° (2) 40 N at 0° (3) 77 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?
Tuesday, February 11, 2014 at 9:29am

Physics
Two forces are exerted on an object. A 33 N force acts at 215° and a 45 N force acts at 315°. What are the magnitude and direction of the equilibrant?
Tuesday, February 11, 2014 at 9:29am

Physics
A 172 N sign is supported in a motionless position by two ropes that each make an angle of 36° with the horizontal. What force does each rope exert?
Tuesday, February 11, 2014 at 9:28am

physics
How is pressure applied in the following areas 1. Measurement of blood pressure using spygmomanometer. 2.Giving injections 3.Administering intravenous transfusion 4.Giving oxygen in the ward and operation theater 5.Administering blood transfusion 6.Sucking excess blood after ...
Tuesday, February 11, 2014 at 8:30am

Science
Associate each item in the table with at least one field of science and one area of technology/engineering. Choose from the terms given at the bottom. Automobile aspirin shirt computer pesticide satellite robot atomic bomb vaccination can of soup polyester wrapper skyscraper ...
Tuesday, February 11, 2014 at 1:00am

Physics
An object moving along a horizontal track collides with and compresses a light spring (which obeys Hooke's Law) located at the end of the track. The spring constant is 38.6 N/m, the mass of the object 0.270 kg and the speed of the object is 1.20 m/s immediately before the ...
Tuesday, February 11, 2014 at 12:24am

Physics
If the resistances R1= 16. ohms, R2 = 38. ohms, and R3 = 18. ohms, and the voltage V = 6.0 volts, what is the current ix (in Amperes) in the circuit. tinypic .cm /r / nfr48k/ 8 The correct answer is .1443 but I want to know how they got that. Thanks.
Monday, February 10, 2014 at 10:39pm

algebra based physics
A proton is held at a fixed position. An electron is placed 0.85m away and released. Find the electron's speed when it's 9.0mm from the proton.
Monday, February 10, 2014 at 10:21pm

algebra based physics
Two identical 20g particles each carry 4.0μC of charge. One is held fixed, and the other is placed 1.0 mm away and released. Find the speed of the moving charge when it's 1.0 cm from the fixed charge. Find the speed of the moving charge when it's 1.0 km from the ...
Monday, February 10, 2014 at 10:20pm

algebra based physics
Three point charges of 2.0 μ C, 4.0 μ C, and 6.0 μ C form an equilateral triangle with each side 2.0cm. Find the electric potential energy of this distribution.
Monday, February 10, 2014 at 10:15pm

algebra based physics
Two protons in a nucleus are separated by 8.0×10−15m . What's the potential energy of the pair?
Monday, February 10, 2014 at 10:13pm

algebra based physics
An electron in an oscilloscope tube is traveling horizontally with a speed of 4.4×106m/s . It passes through a 2.1cm long region with an electric field pointing upward with a magnitude of 1500N/C. what is the magnitude of the electron’s velocity when it emerges from...
Monday, February 10, 2014 at 10:13pm

algebra based physics
Electric bees. As they fly through the air, honeybees can pick up a small amount of electric charge. Suppose a 0.12-g bee acquires a charge of –65pC. How many excess electrons has the bee acquired? Find the magnitude of the electric force on the bee in the electric field ...
Monday, February 10, 2014 at 9:59pm

physics
A pair of parallel plates are charged with uniform charge densities of –32pC/m2 and +32pC/m2 . The distance between the plates is 2.5mm . If a free electron is released at rest from the negative plate, find its speed when it reaches the positive plate. Find the time it ...
Monday, February 10, 2014 at 9:52pm

physics
Two parallel plates carry uniform charge densities –0.45nC/m2 and +0.45nC/m2 . Find the magnitude of the electric field between the plates. Find the magnitude of the acceleration of an electron between these plates.
Monday, February 10, 2014 at 9:51pm

physics
A remote-control vehicle moves forward with constant acceleration. During the first two seconds, it travels 55.0(cm), and during the following two seconds, another 77.0(cm) (a) Calculate the vehicle’s initial velocity and its acceleration. (b) What distance will it...
Monday, February 10, 2014 at 9:45pm

Physics
Make a predictive statement about the path dependence of accelerations due to gravity
Monday, February 10, 2014 at 9:12pm

Physics
Calculate the time it would take for an object to fall through a linear height equal to the objects starting height, h for a 20 degree incline.
Monday, February 10, 2014 at 7:31pm

Physics
An object begins at rest on a frictionless inclined plane at a linear distance of 2.0m from the base of the incline. If the incline makes an angle of 20 degrees with the horizontal, determine the time it will take for the object to reach the base of the incline.
Monday, February 10, 2014 at 7:30pm

Physics
An object is placed on a frictionless inclined plane, and will accelerate at a constant rate. Determine the amount of acceleration due to gravity both parallel and perpendicular to the incline.
Monday, February 10, 2014 at 7:28pm

physics Momentum and impulse
You want to close an open door by throwing either a 400g lump of clay or a 400g rubber ball at it. You throw at the same speed, but the clay sticks to the door and the ball bounces off it. Which works bette?
Monday, February 10, 2014 at 5:57pm

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.3 m/s and ax = +2.6 m/s2. The y components of the puck's initial velocity and acceleration are ...
Monday, February 10, 2014 at 5:34pm

physics
Two pianos each sound the same note simultaneously, but they are both out of tune. On a day when the speed of sound is 348 m/s, piano A produces a wavelength of 0.766 m, while piano B produces a wavelength of 0.780 m. How much time separates successive beats?
Monday, February 10, 2014 at 3:13pm

physics
A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
Monday, February 10, 2014 at 1:01pm

physics
A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
Monday, February 10, 2014 at 12:59pm

physics
a projectile is thrown from the ground with an initial velocity of 20.0 m/s at an angle of 40.0 degrees above the horizontal. find the projectile's maximum height, the time required to reach its maximum height, its velocity at the top of the trajectory, the range of the ...
Monday, February 10, 2014 at 12:32pm

Physics
A fisherman is fishing from a bridge and is using a "49.0-N test line." In other words, the line will sustain a maximum force of 49.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at ...
Monday, February 10, 2014 at 12:10pm

Physics
A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
Monday, February 10, 2014 at 10:58am

physics
Poissons equation for the yukawa potential is given by; Phi(r)=-(G*M exp(-alpha*r))/r what is the analogue of poissons equation for this potential.
Monday, February 10, 2014 at 8:13am

physics
A submarine dives from the water surface at an angle of 31° below the horizontal, following a straight path 75 m long. How far is the submarine then below the water surface? A)75 m B)(75 m)/sin 31° C)(75 m)sin 31° D)(75 m)cos 31° E)none of these answers
Monday, February 10, 2014 at 1:08am

physics
A submarine dives from the water surface at an angle of 31° below the horizontal, following a straight path 75 m long. How far is the submarine then below the water surface?
Monday, February 10, 2014 at 1:07am

physics
A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.840 m/s at an angle of 36.0° above the table, and it lands on the magazine 0.0710 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
Sunday, February 9, 2014 at 10:38pm

physics
What is the maximum amplitude of the resultant waves at the position of 2 . 7 m along the x -axis?
Sunday, February 9, 2014 at 10:32pm

Physics
suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
Sunday, February 9, 2014 at 9:07pm

Physics
Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?
Sunday, February 9, 2014 at 8:50pm

physics
f the vertical initial speed of the ball is 4.0m/s as the cannon moves horizontally at a speed of 0.70m/s , how far from the launch point does the ball fall back into the cannon? What would happen if the cannon were accelerating?
Sunday, February 9, 2014 at 8:44pm

Physics
suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
Sunday, February 9, 2014 at 8:36pm

Physics
You buy yourself a new Lamborghini which can accelerate from 0 to 62 mph in 2.5 seconds. 1.) what is the magnitude of the car's acceleration in SI units? 2.)the latest figures on speeding related car accident fatalities show 32788 deaths per year in the united states. in ...
Sunday, February 9, 2014 at 8:31pm

physics
Buffy is rolling along in her 12.7 kg wagon at 3.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.2 m/s relative to the ground. This causes her wagon to go speeding forward at 9.51 m/s relative to the ground. How much does Buffy...
Sunday, February 9, 2014 at 8:12pm

physics
You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around the same coil have to ...
Sunday, February 9, 2014 at 8:08pm

physics
Buffy is rolling along in her 11.1 kg wagon at 4.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.5 m/s relative to the ground. This causes her wagon to go speeding forward at 13.03 m/s relative to the ground. How much does ...
Sunday, February 9, 2014 at 8:07pm

physics
A man is in a boat out away from shore. Th mass of the man, the boat and everything in it is 210 kg. The boat is not moving. The man throws and anchor with a mass of 26 kg straight out from the boat with a speed of 6.6 m/s. What is the resulting speed of the boat?
Sunday, February 9, 2014 at 8:06pm

Physics
If a salmon swims straight upward in the water fast enough to break through the surface at a speed of 5 meters per second, how high can it jump above water?
Sunday, February 9, 2014 at 7:52pm

Physics
You're driving down the highway at 20m/s when you see a dog you don't want to crush it 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled before coming to a...
Sunday, February 9, 2014 at 7:38pm

Physics
You're driving down the highway at 20m/s when you see a dog you don't want to crush it 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled before coming to a...
Sunday, February 9, 2014 at 7:38pm

Physics
A sand bag is dropped out of a balloon traveling upward at speed of 2.3m/s. A kiddo drops a bag at the instant the balloon is 34m above the ground. How long does it take the sand bag to hit the ground? I got -2.41s why?
Sunday, February 9, 2014 at 7:29pm

Physics
A motorist drives north for 33.0 minutes at 77.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h. a) What is his total displacement in km? b) What is his average velocity km/h?
Sunday, February 9, 2014 at 7:24pm

physics
A block of wood with a mass of 4.62 kg sits on the edge of a table that is 0.99 m tall. A bullet with a mass of 70.5 g traveling with a speed of 450 m/s is shot into the block and is lodged in it. Assuming that no energy is lost to friction, how far from the table will the ...
Sunday, February 9, 2014 at 7:12pm

physics
A balistic pendulum is made from a block of wood with a mass of 2.78 kg. A bullet with a mass of 39 g is shot into the block causing it to rise 29.1 cm. What was the speed of the bullet?
Sunday, February 9, 2014 at 7:10pm

physics
passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both observers ...
Sunday, February 9, 2014 at 7:09pm

Physics
You are driving through town at 12m/s when suddenly a ball rolls out aim front of you. You apply the brakes and begin decelerating at 4ms^2. How long does it take you to stop? The answer I got is -3 is that possible!!!!??! I'm not sure what doing wrong.
Sunday, February 9, 2014 at 7:02pm

Physics
Can an object with constant acceleration reverse it's direction of travel? I think it's yes because when a ball is thrown in the air it has a constant acceleration of gravity and the acceleration continues when it reverses it's direction. Am I right??
Sunday, February 9, 2014 at 6:55pm

physics
A cue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s final speed is 1.3 m/s.Find the cue ball’s angle θ with respect to its original line of motion. Consider this to be an ...
Sunday, February 9, 2014 at 5:41pm

physics 1
Only two forces act on an object (mass=4.00 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.
Sunday, February 9, 2014 at 5:12pm

Physics
A particle moves according to the equation x= (10 m/s^2)t^2 where x is in meters and t is in seconds. a. Find the average velocity for the time interval from t1= 2.38 s to t2= 4.3 s. Answer in units of m/s. b. Find the average velocity for the time interval from t1= 2.38 s to ...
Sunday, February 9, 2014 at 4:48pm

physics
a stone is thrown vertically upward with a speed of 10.5 m/s from the edge of a cliff 76.0 m high. how much later does it reach the bottom of cliff? what is its speed just before hitting? what total distance did it travel
Sunday, February 9, 2014 at 4:43pm

Physics
A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s.
Sunday, February 9, 2014 at 4:41pm

Physics
A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y axis points vertically upward. The acceleration of gravity is 9.8 m/s^2. a.Neglecting air resistance, calculate the...
Sunday, February 9, 2014 at 4:38pm

physics
If the vertical initial speed of the ball is 4.0m/s as the cannon moves horizontally at a speed of 0.70m/s , how far from the launch point does the ball fall back into the cannon? What would happen if the cannon were accelerating?
Sunday, February 9, 2014 at 2:06pm

physics
A person riding in the back of a pickup truck traveling at 60km/h on a straight, level road throws a ball with a speed of 10km/h relative to the truck in the direction of the truck's motion.What is the velocity of the ball relative to a stationary observer by the side of ...
Sunday, February 9, 2014 at 2:04pm

science/physics
If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
Sunday, February 9, 2014 at 1:19pm

physics/science
If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
Sunday, February 9, 2014 at 10:41am

Physics
a vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
Sunday, February 9, 2014 at 6:17am

Physics
A train at a constant 41.0 km/h moves east for 28 min, then in a direction 53.0° east of due north for 15.0 min, and then west for 64.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
Sunday, February 9, 2014 at 6:16am

Physics
A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
Sunday, February 9, 2014 at 6:15am

Physics
A calorimeter with specific heat of 490x10^2J/kg^1K^1 has a mass of 2.00x10^-1kg that contains 3.00x10^-1kg of liquid water at 40C. If 5.00x10^-2kg of ice at 0C is dropped into the water. Find the final temperature of the mixture where the ice has melted is 23.8C. Calculate ...
Sunday, February 9, 2014 at 2:41am

physics 2 for college
a jet propelled motorcycle start from rest moves in a straightline with constant acceleration and covers a distance of 64m in 4seconds.?
Sunday, February 9, 2014 at 1:05am

Physics
Three vectors are given by a= 0i+0j+4.0k , b= 3.0i+ -3.0j+-1.0k and c=1.0i+2.0j+-1.0k. Find (a) a(bxc) and (b)a(b+c)
Sunday, February 9, 2014 at 12:17am

Physics
For the vectors with a = 3.3 and b = 2.2, what are (a) the z component of AxB, (b) the z component of AxC, and (c) the z component of BxC?
Sunday, February 9, 2014 at 12:15am

Physics
A vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
Sunday, February 9, 2014 at 12:13am

Physics
In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the angle (relative to...
Sunday, February 9, 2014 at 12:13am

Physics
Oasis B is a distance d = 7.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 22 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 34 km due north. ...
Sunday, February 9, 2014 at 12:11am

Physics
A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
Sunday, February 9, 2014 at 12:06am

Physics
A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
Sunday, February 9, 2014 at 12:04am

Physics
A jet plane has a takeoff speed of Vto=125km/h (34.72 m/s) and it's engines can power it to accelerate with an average acceleration of 5.6 m/s^2. A.) what length of runway will it need to take off safely? B.) suppose it had an available runway length of only 75m. What ...
Saturday, February 8, 2014 at 10:01pm

physics
A car is moving down a highway at -15 m/s and accelerating at 3 m/s^2. If it's initial position is at x = 0 m where will it be after 3 seconds?
Saturday, February 8, 2014 at 9:52pm

Physics
Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
Saturday, February 8, 2014 at 8:44pm

Physics
Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
Saturday, February 8, 2014 at 7:16pm

Physics
18 cars in a circle at a boom box competition produce a 105 dB sound level at the center of the circle. What is the average sound level produced there by each, assuming interference effects can be neglected? dB = ?
Saturday, February 8, 2014 at 7:15pm

physics
a bead on a wire 30m high is released and reaches point A, where is loops twice towards the right. what is the velocity and acceleration at point A-D? point A is at 20m directly below from starting point. Point B is 10m at the bottom of the first loop. point C is in between ...
Saturday, February 8, 2014 at 7:06pm

Physics
The only force acting on a 4.7 kg body as it moves along the positive x axis has an x component Fx = -6x N, where x is in meters. The velocity of the body at x = 2.4 m is 11 m/s. (a) What is the velocity of the body at x = 4.9 m? (b) At what positive value of x will the body ...
Saturday, February 8, 2014 at 6:51pm

Physics
Two cars pass a school when a stopwatch reads zero. They both travel in the same direction. Car A travels at a constant speed of 98 km/h and Car B travels at 64 km/h. How many meters apart are the two cars when the stopwatch reads 2.0 hours?
Saturday, February 8, 2014 at 4:23pm

Physics
What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton
Saturday, February 8, 2014 at 4:15pm

Physics
The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
Saturday, February 8, 2014 at 4:11pm

Physics
A trash can with a mass of 5 kg has a coefficient of static friction of μs = 0.80 and a coefficient of kinetic friction of μk = 0.22. (The Active Figure applies to a similar situation, but the values of the mass, coefficient of static friction and coefficient of ...
Saturday, February 8, 2014 at 3:43pm

Physics
Charges of −q and +2q are fixed in place, with a distance of 4.65 m between them. A dashed line is drawn through the negative charge, perpendicular to the line between the charges. On the dashed line, at a distance L from the negative charge, there is at least one spot ...
Saturday, February 8, 2014 at 11:52am

physics
Suppose electrons enter a uniform electric field midway between two plates at an angle ¦È0 to the horizontal, as shown in the figure
Saturday, February 8, 2014 at 11:42am

Physics
You and a friend each drive 54 km. You travel at 95 km/h; your friend travels at 118 km/h. How many minutes will your friend have to wait for you at the end of the trip?
Saturday, February 8, 2014 at 11:35am

physics
Two identical weights of mass M are linked by a thread wrapped around a frictionless pulley with a fixed axis. A small weight of mass ‘m’ is placed on one of the weights. What is reaction force between m and M?
Saturday, February 8, 2014 at 11:05am

physics
2 tall buildings are 200m apart. with what speed a ball be thrown horizontally from a window of one building 2km above the ground so that it will enter a window 40m from the ground in the other?
Saturday, February 8, 2014 at 2:40am

physics
a block of wood of 200g is thrown vetically with a veloncity of 20mls what is the pontential energy?
Saturday, February 8, 2014 at 12:29am

Physics Help, check work?
A running track consists of two straight 88.5m segments and two semicircles of radius 39.0m as shown in the figure. Part A was finding the distance a runner travels in one complete lap. d= 422 m. No problem. Then part B asks for the displacement in x, y components of a runner ...
Friday, February 7, 2014 at 8:47pm

physics
What is the resistance of a 7.4-m length of copper wire 1.2mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m. R=_________
Friday, February 7, 2014 at 8:30pm

physics
A constant voltage is applied across a circuit. If the resistance in the circuit is doubled, what is the effect on the power dissipated by the circuit? a. The power dissipated is reduced by a factor of 4. b. The power dissipated is quadrupled. c. The power dissipated is ...
Friday, February 7, 2014 at 8:28pm

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