Friday
September 4, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
mod of a cap - b cap = ¡Ì2 then calculate the value of mod of a cap + ¡Ì3b acp
Saturday, July 25, 2015 by Vijay

physics
The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 20 decibels, the new intensity (in ìW/cm2) is : a. 60 b. 6.6 c. 6.06 d. 600 E. 12
Friday, July 24, 2015 by khaled fayek

Physics
An automobile has four tires, each one inflated to a gauge pressure of 176,357 Pa. Each tire is slightly flattened by its contact witht he ground, so that the area of contact is 21.9 cm by 17.9 cm. What is the weight of the automobile?
Friday, July 24, 2015 by Kirsten

physics
A man cleaning his apartment pushes a vacuum cleaner with a force of magnitude 55.8 N. The force makes an angle of 15.3 ◦ with the horizontal floor. The vacuum cleaner is pushed 3.55 m to the right along the floor. Calculate the work done by the 55.8 N force. Answer in ...
Friday, July 24, 2015 by marissa

nvas physics
A body is thrown vertical ly upward with a velocity of the 21m/s find maximum height reached by body
Thursday, July 23, 2015 by swayam

Physics
Find the gravitational force acting on the Sun by the Earth. Given: Mass of the Sun = 1.99 * 1030 kg Mass of the Earth = 5.98 * 1024 kg Radius of the Sun = 6.96 * 108 m Radius of the Earth = 6.37 * 106 m Distance between the Sun and the Earth = 1.50 * 1011 m G = 6.67 * 10–...
Thursday, July 23, 2015 by Emily

Physics
The two ropes shown in the bird's-eye view of (Figure 1) are used to drag a crate 3.7 m across the floor. How much work is done by the force fk→? How much work is done by the force T1→? How much work is done by the force T2→?
Wednesday, July 22, 2015 by Tommy

Physics/ Chemistry
The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
Wednesday, July 22, 2015 by Anonymous

Physics
We commonly see Superman being shot and bullets bounce off of him. Suppose Mr. Bad shoots Superman with 4.00 kg bullets at a rate of 100 bullets/min for 9.00 s. If the speed of each bullet is 480.00 m/s and rebounds straight back with no change in speed, calculate the ...
Wednesday, July 22, 2015 by Anonymous

Physics
An example of an elastic collision is The gravitational slingshot effect . A spacefship of mass 850 kg is moving at 9.5 km/s in the +x direction. It approaches the planet Saturn, mass 5.68 x10 26kg , which is moving in the –x- direction as shown in the figure. The ...
Wednesday, July 22, 2015 by Anonymous

Physics Momentum: Elastic Collision
The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
Wednesday, July 22, 2015 by Anonymous

Physics
A 7900 kg truck traveling east at 5 m/s collides with a 1650 kg car traveling 300 south of west at 20 m/s. After the collision at what angle do the two vehicles move. Express you answer in degrees from the positive x-axis. Use a coordinate where north is the +y axis and east ...
Wednesday, July 22, 2015 by Anonymous

physics
When a car screeches to a sudden stop to avoid hitting a dog, it slows down from 9.00 m/s to 0.00 m/s in 1.50 s. Find the average acceleration of the car?
Wednesday, July 22, 2015 by ARI

Physics
A 2.1-kg 15-cm-radius cylinder, initially at rest, is free to rotate about the axis of the cylinder. A rope of negligible mass is wrapped around it and pulled with a force of 14 N. (a) Find the magnitude of the torque exerted by the rope. ?N · m (b) Find the angular ...
Tuesday, July 21, 2015 by Anonymous

Physics
A steel ball of mass m1 = 1.1 kg and a cord of length of L = 2.3 m of negligible mass make up a simple pendulum that can pivot without friction about the point O, as in the figure below. This pendulum is released from rest in a horizontal position, and when the ball is at its ...
Tuesday, July 21, 2015 by Anonymous

Physics
A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s Any help is greatly appreciated. ...
Tuesday, July 21, 2015 by Raj

Physics
A 10.0-m long wire whose total mass is 39.5 grams is under a tension of 577 N. A pulse is sent down the left end of the wire and 29 ms later a second pulse is sent down the right end of the wire. Where do the pulses first meet?
Tuesday, July 21, 2015 by Ken

Physics
A solid cylinder rolls down an incline plane without slipping. If the center of mass of the cylinder has a linear acceleration of 2.67 m/s2, what is the angle of the incline to the horizontal?
Tuesday, July 21, 2015 by Mary

physics
A ball is projected horizontally from the top of a building 19.6m high.if the line joining the point of projection to the point where it hits the ground makes an angle of 45° to the horizontal what is the initial velocity of the ball
Monday, July 20, 2015 by abc

Physics
A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s
Monday, July 20, 2015 by Anonymous

physics
the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal
Monday, July 20, 2015 by joseph

uniben/physics
the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal
Monday, July 20, 2015 by joseph

physics
A golf cart has an acceleration of 0.4 m/s². What is its velocity after it has covered 10 m starting from the rest?
Monday, July 20, 2015 by Anonymous

physics
The driver of a train traveling at 30 m/s applies the brakes when he passes an amber signal. The next signal is 1.5 km/h down the track and it reaches 75 seconds later. Assuming uniform acceleration, find the velocity of the train at the second signal.
Monday, July 20, 2015 by Anonymous

Physics
A 500 g block slides down a frictionless inclined plane. At the bottom, a vertical circular loop with radius 67 cm is in the block’s path. From what height would the block need to be released to successfully complete the loop without losing contact with the surface of the...
Monday, July 20, 2015 by wiyad

physics
a gas is filled in a vessel at 27 degree Celsius. to what temp should it be heated so that it 1/3rd of of the gas escapes out of the vessel? my attempt to solve; i tried applying charles law. so, V1/V2= T1/T2. V2= V1+V1/3= 4V1/3 hence, applying charles law V1/V2= 3/4 T1/T2= ...
Sunday, July 19, 2015 by saumya

physics(kinematics)
The acceleration of a particle is defined by the relation a=-8m/s2. Knowing that x=20m when t=4 and that x=4m when v=16m/s. Determine. A)the time when the velocity is zero. B)the velocity and total distance traveled when t=11s.
Sunday, July 19, 2015 by ben

blue bells model school
Science physics A ball A moving with kinetic energy E makes a head on elastic collision with a stationary ball with mass n times that as A . What is the potential enery stored during collision ?
Sunday, July 19, 2015 by kanika

physics
doing webwork when i came across this question. sure i had it right but apparently im not. The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.20 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in...
Sunday, July 19, 2015 by sam

Physics
A bridge is 200 m long. A car weighing 2.5 metric tons is 50 m from one end of the bridge and a trucj weighing 6 metric tons is 80 m from the other end. The bridge is uniformly paved and weighs 20 metric tons. How much force does the vertical support at each end exert?
Sunday, July 19, 2015 by Julie

Physics
A 30-N non-uniform pole, 5m long, was used to carry a load of 400 N by two men. The load was hung at the middle of the pole. Find the center of gravity of the pole if the force exerted by each man on each end were 220 N and 210 N respectively.
Sunday, July 19, 2015 by Julie

Physics
The ends of a rope are tied to two hooks on a ceiling. A set of books weighing 36.0 N is tied and hung on the rope so that the segments of the rope make angles of 35 degrees and 50 degrees respectively with the horizontal. Compute for the tension on each segment of the rope.
Sunday, July 19, 2015 by Julie

Physics
A borad, 3m long, is hinged at point a and is supported by a vertical rope at point b, 2m from a. A boy weighing 200 N stands at the end of the board at point c. Neglecting the weight of the board, calculate the force on the rope.
Sunday, July 19, 2015 by Julie

Physics
A uniform rod 1.2 m long has weight of 1000 dynes and 2000 dynes at its ends. At what point on the rod can it be balanced horizontally if the rod weighs 2500 dynes?
Sunday, July 19, 2015 by Julie

Physics
A weight of 340 N is suspended from a pole by means of a rod 4m long and a rope tied to one end 3m above. Find the tension on the rope the force of the rod.
Sunday, July 19, 2015 by Julie

Physics
A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?
Saturday, July 18, 2015 by julie

Physics
A girl weighing 310 N sits on a hammock supported by two ropes. Each tied 60 degrees from vertical posts. What is the tension on each ropes?
Saturday, July 18, 2015 by Julie

Physics
A particle with a mass of 3.65×10−24 kg and a charge of 6.40×10−19 C starts at rest and is accelerated for a distance of 0.102 m through a uniform electric field having strength E = 7.25×104 N/C. What is the resulting speed of the particle?
Saturday, July 18, 2015 by Skippy

Physics 2
Three point charges are fixed on the x-axis: 2.9×10−6 C at x = −0.45 m, −9.3×10−6 C at the origin, and 9.1×10−6 C at x = 0.32 m. Find the electrostatic force acting on the charge at the origin due to the other two charges. Let a ...
Saturday, July 18, 2015 by Skippy

Physics 2
A particle with a mass of 3.65×10^−24 kg and a charge of 6.40×10^−19 C starts at rest and is accelerated for a distance of 0.102 m through a uniform electric field having strength E = 7.25×10^4 N/C. What is the resulting speed of the particle(m/s)?
Saturday, July 18, 2015 by Skippy

physics
A stone is dropped from a height of 4.5m.What will be the distance travelled by it during the last second of its fall?
Friday, July 17, 2015 by dona

physics
Calculate the work done if a force of 300N Is applied at 30° to the horinzontal and body moves 20m
Wednesday, July 15, 2015 by tina loko

physics
What is the variable and unit for centripetal force and centripetal acceleration?
Wednesday, July 15, 2015 by M

Rabindra sahu
What is physics?
Wednesday, July 15, 2015 by Rabindra sahu

Stanger Secondary ex-school
What subjects do u really need to do for art such as Drawing and Poetry...#"compulsory subjects" for these arts. Is it: Physics,pure math,geog,life sciences,mech tech,EGD,mah.lit,BS,history,economics,..​.which ones are needed??? Ain't u shuld be smart in ...
Wednesday, July 15, 2015 by Philile Teddy Nhleko

Physics
The force F sub x acting on a particle is shown as a function of X. If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m ? I have no clue how to do about solving this. Any help ...
Wednesday, July 15, 2015 by Anonymous

Physics
What is the angle between the vectors A and B if vector A multiplied by vector B = 0.5 AB
Wednesday, July 15, 2015 by Sarah

physics
a stone is dropped from a cliff 100 ft high .disregarding friction; a.how long does it take the stone to hit the ground b.With what speed and direction does it strike the ground?
Wednesday, July 15, 2015 by happy

physics
A marble is thrown vertically downward at an initial velocity 200cm/s hits the floor in 2.5 seconds ,At what height is the marble thrown?
Wednesday, July 15, 2015 by happy

physics
A stone is dropped from a cliff 100 ft. high. Disregarding friction; a. how long does it take the stone to hit the ground? b. With what speed and direction does it strike the ground?
Wednesday, July 15, 2015 by happy

Physics
A mineshaft has an elevator hung from a single steel-wire cable of diameter 2.5 cm. Young's modulus of the cable is 10×1010N/m2. When the cable is fully extended, the end of the cable is 500 m below the support. How much does the fully extended cable stretch when ...
Wednesday, July 15, 2015 by Tommy

physics
What force provides the centripetal force when you swing a stopper with a string above your head horizontally? If the string breaks suddenly, in what direction will the stopper fly to?
Tuesday, July 14, 2015 by Tobias

physics
A force of 1.3N results in the movement of an object 3.1m northeast.How much work is done
Tuesday, July 14, 2015 by tina loko

Physics
If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m?
Tuesday, July 14, 2015 by Anonymous

physics
dipole consisting of charges 250nm apart, is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 105. what is the maximum potential energy the dipole can have
Tuesday, July 14, 2015 by m3

PHYSICS
Two equal forces applied to a rotating rod, one very close to the axis and one far from the axis. Which force produces the largest torque? a. the one closest to the axis b. the one furthest from the axis How would you kick a football so that id did not spin end over end? a. at...
Tuesday, July 14, 2015 by anonymous

PHYSICS
) An electron of mass m and charge q = -e is released with an initial speed v ; from the center of the hole (at the origin) in the upward direction (along the perpendicular axis [0 the washer) experiencing no forces except repulsion by the charges on the washer. What speed ...
Tuesday, July 14, 2015 by Anonymous

PHYSICS
Imagine a soap film (air-soapy water-air) of 1 l,m thickness, and refractive index of 1.5 with white light normal to the film. Which wavelengths in the optical range (400 nm to 700 nm) will appear brightest?
Tuesday, July 14, 2015 by Anonymous

Physics
In a Young's double-slit experiment, the slits are 1mm apart and are illuminated by laser light of wavelength 681.8nm. The screen is 3.9m away. What is the number of dark fringes per centimetre?
Tuesday, July 14, 2015 by Amber

physics
A student is thrown in a lake by his teacher, the student has a mass of 70 kg and a volume of 80,000 cm^3. Would the student sink or float? What is the net force on the student? What is the density of an object that has a mass of 2000 kg and a volume of 1.5 m^3? Would it sink ...
Tuesday, July 14, 2015 by John

physics
a stone is thrown horizontally with an initial velocity of 15m/s from a tower 20 meters high. How long does the stone take to reach the ground?
Tuesday, July 14, 2015 by wilson

Physics
A 2 kg block of cheddar cheese hangs from an ideal spring of negligible mass. When displaced from equilibrium and released, the cheese oscillates with a period of 0.4 secs. How much the spring stretched when the cheese hangs in equilibrium?
Tuesday, July 14, 2015 by Kristina

Physics, Eectric flux
A cubical Gaussian surface surrounds three positive charges, each has a charge q1 = +4.00 × 10-12 C, and two negative charges, each has a charge q2 = −2.30 × 10-12 C as the drawing shows. What is the electric flux passing through the surface?(The permittivity...
Monday, July 13, 2015 by Dave

Physics
An airplane pulls into a vertical loop, and has horizontal and vertical velocities Vx=90m/s and Vy=120m/s. If the radius of curvature of the flight path is R=900m, and the airplane has a vertical acceleration Ay=11m/s^2, determine its tangential and horizontal accelerations at...
Monday, July 13, 2015 by J.T.

Chemistry/Physics
How much heat is required to raise the temperature of 100 g of lead 20 degrees C? The specific heat of lead is 0.0305 cal/g K. A) 51 cal B) 61 cal C) 71 cal D) 81 cal
Monday, July 13, 2015 by Domino

School of Christ International, physics
A value of 22.0m of nitrogen gas at 20°c is heated under constant pressure to 167°c What is the new nitrogen gas
Monday, July 13, 2015 by MOSES

Physics
The electric potential at a position located a distance of 20.1 mm from a positive point charge of 6.50×10-9C and 12.1 mm from a second point charge is 1.26 kV. Calculate the value of the second charge.
Monday, July 13, 2015 by Julie

Physics
Three people pull horizontally on ropes attached to a post, as shown in the figure.(Figure 1) The total force that they exert on the post is zero. One of them pulls directly north with F1 = 500 N . Another pulls with F2 = 400 N in a direction 60.0∘ west of north. Find ...
Monday, July 13, 2015 by Nerdy

physics
A player kicks a football at an angle of 45 degree with initial speed of 20 metre per second a second player on the goal line 60 metre away in the direction of a kick start training to receive the ball at that instant find the constant speed of the second player with which he ...
Monday, July 13, 2015 by palash

physics
A picture hangs on the wall suspended by two strings, as shown in the figure, with θ = 65°. The tension in string 1 is 1.3 N. (a)Is the tension in string 2 greater than, less than, or equal to the tension in string 1? Explain. (b) Verify your answer to part (a) by ...
Sunday, July 12, 2015 by john

physics
A baseball player slides into third base with an initial speed of 7.75 m/s. If the coefficient of kinetic friction between the player and the ground is 0.45, how far does the player slide before coming to rest?
Sunday, July 12, 2015 by john

physics
speed limit on freeway is 36 m/s and speed limit on service drive is 9 m/s. Mr. Scotts focus has a mass of 900 kg. Since friction depends on so many factors such as the condition of the vehicle and direction of wind, the civil engineer neglects it. 1. How deep should the ...
Sunday, July 12, 2015 by sani

Physics
A picture hangs on the wall suspended by two strings, as shown in the figure, with θ = 65°. The tension in string 1 is 1.3 N. (a)Is the tension in string 2 greater than, less than, or equal to the tension in string 1? Explain. (b) Verify your answer to part (a) by ...
Sunday, July 12, 2015 by mohammad

Physics
A brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change. Using the equation Change in temp=change in length/original length * coefficient of linear expansion for brass I am getting the following result: .0734 cm/(1.9x10^-5)(50 cm) = 193157.8947 Can ...
Sunday, July 12, 2015 by Jackie

physics
The coefficient of static friction between a block and a horizontal floor is 0.33, while the coefficient of kinetic friction is 0.11. The mass of the block is 3.7 kg. If a horizontal force is slowly increased until it is barely enough to make the block start moving, what is ...
Sunday, July 12, 2015 by shahanoor

Physics
The problem statement, all variables and given/known data A body is thrown upward and remains in air for 10 seconds , the initial velocity at which it was thrown in is? The attempt at a solution g = -10 , t = 10 s , vf = 0 , vi = ? Vf = vi + gt 0=vi + (-10) (10) Vi = 100 but ...
Sunday, July 12, 2015 by Shahab Mirza

Physics
A car travelling with constant acceleration increases its speed from 10 m/s to 50 m/s over a distance of 60 m . how long does this take? a. 2 seconds b. 4 seconds . Data : Avg Velocity = 10 + 50 / 2 = 30m/s Distance = 60 meter time = ? Solution : S= V x T making "T" ...
Sunday, July 12, 2015 by Shahab Mirza

Physics
A 480 N man is standing on a 120 N pole supported by 2 blocks. The pole is 6 m long. One block is at the end while the other is 2 m away from the center. Where should the 480 N man stand?
Sunday, July 12, 2015 by Patrick

physics
A 320 N bench is 2.40m long. The legs are .30m from each end and weigh 15.0 N each. If 3 persons weighing in order ,500 N, 750N, and 1000N sit .40m, 1.20m, and 2m respectively from one end of the bench, what downward force must each set of legs exert on the floor?
Sunday, July 12, 2015 by John

Physics
If a parallel-plate capacitor in a RC circuit has a 10 C charge on each plate when it is disconnected from the battery, and in 10 sec drops to 10% of its initial charge, what is its capacitance? (Assuming R = 10 ohms) Not sure which formula to use/
Saturday, July 11, 2015 by Patch

Physics
Hello! I am having trouble figuring out the answer for this question: A 60 kg water skier is being pulled behind a boat. If the propulsive force applied by the 500 kg boat is 2.50 * 10^3 N, determine the acceleration of the skier and tension force in the tow rope? Work: Fnet= ...
Saturday, July 11, 2015 by Lucina

physics
cant find much on how to solve problems like these. any help would be appreciated. A pressure of 6000 Pa is exerted on a wall of 12 square meters area. What force is exerted on the wall? What is the pressure at the bottom of a 50 m tall water tower? What is the pressure at the...
Saturday, July 11, 2015 by ?

physics
An ammeter indicates the current for a toaster is 5.0 amps when the toaster is connected to 120-V circuit. How much energy is given off by the toaster in 55.0 seconds? Show all calculations leading to an answer.
Saturday, July 11, 2015 by allexelle

physics
Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
Saturday, July 11, 2015 by allexelle

physics
A hard-rubber or plastic comb rubbed against wool can often be shown to have a static charge. Why does a metal comb not readily show a static charge when rubbed against wool? Use 3 – 4 complete sentences in your answer.
Saturday, July 11, 2015 by allexelle

physics
Suppose the thickness of an oil film on water is just the right thickness for canceling red light. What color will your eye see? Explain using 3 – 4 complete sentences
Saturday, July 11, 2015 by allexelle

physics
What conditions must exist for a converging lens to produce a real image of an object that is larger than the object itself? Please respond with 3 - 4 complete sentences.
Saturday, July 11, 2015 by allexelle

physics
Suppose a piano tuner hears 2 beats/second when listening to the combined sound from the tuning fork and the piano note being tuned. After slightly loosening the string, she hears 1 beat/second. Should she continue to loosen the string or tighten it in order to get it “in...
Saturday, July 11, 2015 by allexelle

physics
A photon of light has a wavelength of about 600 nm (1nm = 1 x 10-9 m). What is the energy of this photon of light? Show all calculations leading to an answer.
Saturday, July 11, 2015 by allexelle

physics
A ball is thrown at 22m/s at 45 degrees to the horizontal. a fence 5 feet tall is located 100 meters away. Does the ball make it over the fence?
Saturday, July 11, 2015 by MIKE

Physics
M1 = 45.0 kg is a spherical mass at the origin. M2 = 16.6 kg is also a spherical mass, and is located on the x-axis at x = 78.0 m. At what value of x would a third mass M3 = 15.5 kg experience no net gravitational force due to M1 and M2?
Saturday, July 11, 2015 by Natalie

physics
A cement company is moving lime using an Archimedes screw system. The density of the lime p=2700 kg/m^3. The available area inside the screw system A=0.01 m^2 and the screw advance speed v=0.5 m/s. What is the mass flow rate?
Friday, July 10, 2015 by ?

Physics
A particle (charge = +4.0 nC) is located on the x-axis at the point x = -20.0 m, and a second particle (charge = -10.0 nC) is placed on the x-axis at x=+8.0 m. What is the magnitude of the total electrostatic field (in N/C) at the origin (x=0)?
Friday, July 10, 2015 by oday

Physics
In procedure 1: suppose the hanging mass is mH = 203 g and the mass of the cart is mC = 1286 g. a) Assume there is no friction anywhere in the system, and the system starts at rest. i. Find the magnitude of the acceleration of the masses. a = m/s2 ii. Find the magnitude of the...
Friday, July 10, 2015 by Sara

physics
A book has the mass of 1.5 kg what is pressure that it puts down on the table if it has the dimension 20cm by 26 cm? What would the pressure be if it were on end with the dimensions of 20 cm by 4 cm?
Friday, July 10, 2015 by ?

Physics
A boy travels 8km north, 3km east and then 5km south. Find the magnitude of displacement of the boy
Friday, July 10, 2015 by Anhigna

Physics
A boy moves 10km eastwards, 5km northwards and then 2km eastwards. The distance and magnitude of displacement of the boy is
Friday, July 10, 2015 by Anhigna

physics
A bar 4.0 m long weighs 400. N. Its center of gravity is 1.5 m from one end. A weight of 300. N is attached at the heavy end and a weight of 500. N is attached at the light end. What are the magnitude, direction, and point of application of the force needed to achieve ...
Thursday, July 9, 2015 by G

physics
A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 43.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance of 1.10 m from the 30.0-kg child. How long is the beam?
Thursday, July 9, 2015 by Mary

Physics
Four identical point charges of q = 4.64 nC are at the four corners of a square with a side length of 13.5 cm as shown in the figure. What charge Q should be placed at the center of the square to keep the other four charges in equilibrum?
Thursday, July 9, 2015 by Julie

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