Monday

February 27, 2017
**physics**

Potential energy between charges + q at even places and -q on odd places on the corner of a hexagon of edge lenth 'a'

*Wednesday, May 4, 2016 by SUMEDHA*

**PHYSICS**

The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L?

*Wednesday, May 4, 2016 by Caleb*

**Physics**

A 4.00-kg block rests on a 30.0° incline. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline, given g= 9.80m/s^2?

*Wednesday, May 4, 2016 by Justin*

**Physics**

A mass of 20 kg is held 1.20 107 metres above the surface of a planet that has a radius of 1.50 107 metres and a mass of 4.50 1028 kg. a) If the mass were to be dropped freely to hit the surface of the planet, with what velocity would it collide with the planet? Please help...

*Wednesday, May 4, 2016 by Kia*

**Physics**

a)In the series circuits, what do you notice about the voltage across each resistor compared with the voltage of the battery? (There could be more than one answer) 1.The resistor voltages multiplied together give the battery's voltage 2.The resistor voltages subtract to get ...

*Wednesday, May 4, 2016 by Mariah*

**physics**

A 5kg object placed on a frictionless, horizontal table connected to a string that passes over a pulley and then is fastened to a hanging 9kg object. Draw a free body diagram of both the objects. Find the acceleration of the two objects and the tension in the strings.

*Wednesday, May 4, 2016 by Chansa*

**physics**

A bag of cement of weight 325N hangs from wires as Shawn. Two of the wires make angels al=60 degrees a2=50 degrees with the horizontal. If the system is in equilibrium find the tension T1, T2 and T3 in the wires.

*Wednesday, May 4, 2016 by Chansa*

**physics**

A tire 0.5m in radius rotates at a constant rate of 200 rev/min.find the speed and acceleration of a stone lodged in the tread of the tire ( on its outer edge)

*Wednesday, May 4, 2016 by Chansa*

**physics**

A person walks 25 northeast for 3.10km.how far would she have to walk due north and due east to arrive at the same location?

*Wednesday, May 4, 2016 by Chansa*

**physics**

An archaeologist begins a trip by first walking 30km southeast from the campsite. He stops and sets up a temporal camp for the night. On the second day, he walks 60km in direction 60 degree north of east, at which point he discovers the ancient city of gold. a) Determine the ...

*Wednesday, May 4, 2016 by Chansa*

**physics**

The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with an acceleration of -5.6m/s for 4.20s marking straight skid marks 62.4m long ending at the tree with what speed does the car strike the tree?

*Wednesday, May 4, 2016 by Chansa*

**physics**

A Zambian Air Force jet lands with a speed of 100m/s and can accelerate at maximum rate of -5m/s as it comes to rest (a) from the instant the jet touches the runway, what is the minimum time needed before it can come to rest. (b) can the jet land on the small piece of inland ...

*Wednesday, May 4, 2016 by Chansa*

**physics**

A fundamental law of motion states that the acceleration of an object is directly proportional to the resultant force exerted on the object and inversely proportional to the mass.if the proportionality constant has no dimensions, determine the dimensions of forces?

*Wednesday, May 4, 2016 by Chansa*

**physics**

show the expression v=at is dimensionally correct where v represents speed an acceleration and t is instant time?

*Wednesday, May 4, 2016 by Chansa*

**physics**

Doyle goes bowling with a cement brick to improve his score. If the brick has a mass of 1.5kg and an initial speed of 5.0m/s upon release a)how much kinetic energy did it possess upon release i.e. when let it go and b)how far will the brick slide before coming to a halt if the...

*Wednesday, May 4, 2016 by Rosie*

**Physics**

Suppose that two concentric rings, each with equal mass per unit length are joined so that they rotate together. Find the moment of inertia.

*Wednesday, May 4, 2016 by John*

**PHYSICS**

Why do objects gain mass while approaching the speed of light

*Wednesday, May 4, 2016 by STEVIUM*

**Physics**

A steel cable of diameter 15mm supports a lift of total mass 1500kg. If the maximum safe working stress for steel is 10^8 N/m^2, calculate how the lift was moving when the wire broke

*Wednesday, May 4, 2016 by Bob*

**physics**

on the road with Kate. If she is driving a 2500kg car going 75km/h a)how much kinetic energy will it process. b)She asks "How high would I have to lift the car for the same amount of potential energy"? converting 75km/h to m/s

*Wednesday, May 4, 2016 by Annie*

**Physics**

A sprinter has an average speed of 10.2 m/s. What distance, in meters, would the sprinter run in 9.80 s? (Record your answer to the correct number of significant digits)

*Wednesday, May 4, 2016 by HELP ASAP*

**physics**

Tom exerts a force of 75N horizontally to a skateboarder, Steven's mass is 65kg, for a distance of 2.0m on a frictionless floor. A)How much work did Tom do on Steve? B) What was Steven's final speed?

*Wednesday, May 4, 2016 by Rosi3*

**physics**

Kati observes a force of 15N stretch a spring a distance of 0.450m. A) What is the elasticity coefficient of the spring and B) how much force must be done to stretch the spring a distance of 0.750m? a) F=kx k=33.3N ? b)???

*Wednesday, May 4, 2016 by help please*

**Physics**

A runner runs 2.5 km eastward and turns northward to cver twice this distance. What is his displacement ?

*Wednesday, May 4, 2016 by Jona*

**physics**

a car starts from rest and attains a velocity of meter/sec,then acceleration changes and it aquires the velocity of 20meter/sec in next 5sec .then it slows down and comes to rest in next 5sec.draw a velocity-time graph for the given conditions,and find acceleration of 3 given ...

*Wednesday, May 4, 2016 by kiran*

**Physics Please Help!**

A small metal ball with a mass of m = 78.9 g is attached to a string of length l = 1.76 m. It is held at an angle of = 44.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. (Image included with problem) The target box is 2.44 m horizontally from the edge of the table. Bobby compresses the ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

An organ pipe that is open a t both ends has a fundamental frequency of 382 Hz. What is the length of an closed end pipe that has a fundamental frequency exactly one octave higher? Report your answer in m.

*Tuesday, May 3, 2016 by Noah*

**Physics**

Consider an archery bow as behaving like a spring with a spring constant of 493 N/m. If an archer pulls the bowstring back for a distance of 42 cm, what is the elastic potential energy of the "loaded" bow? If the mass of the arrow is 39 grams, what is its speed as it leaves ...

*Tuesday, May 3, 2016 by Kevin*

**physics**

a bullet is fire in a horizontal direction with a muzzle velocity of 300m/s in the absence of air resistance, how far will it have dropped in travely a horizontal distance of(a)20m?(b)40m?(c)60m? how far will it drop in one second

*Tuesday, May 3, 2016 by johnson*

**Physics**

During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 34.0 J. How fast was the ball booted by the player on the field?

*Tuesday, May 3, 2016 by Dan*

**Physics**

Kati observes a force of 15 Newtons stretch a spring a distance of 0.450m. a) what is the elasticity coefficient of the spring and b) how much force must be done to stretch the spring a distance of 0.750m? a) F=Kx 15=K(0.450) 15/0.450=k 33N=k It seems off to me know sure if ...

*Tuesday, May 3, 2016 by Rosie*

**Physics**

A child uses 168 J of work pulling a wagon 25 m up a hill. What is the force exerted on the wagon by the child? (Record your answer to the correct number of significant digits)

*Tuesday, May 3, 2016 by Hanny*

**Physics**

A pitcher throws a fast ball with a speed of 45m/s. The ball has a mass of 0.145kg. How much a) kinetic energy is given to the ball and b)What work was done in throwing the ball? Vo=45 m/s Mass= 0.145kg A) KE? KE= 1/2mV^2 A) 1.5x10^2 kg*m/s B) WK=Change in KE but I'm stuck not...

*Tuesday, May 3, 2016 by Rosie*

**Physics**

A fan pushes a beach ball with a force of 10.0 N. If the work done on the ball is 150 J, the distance the ball will travel is ______ m. (Record your answer to the correct number of significant digits)

*Tuesday, May 3, 2016 by Hanny*

**plz help physics!!!!**

A proton is moving in vacuum along a straight path from A to B .It passes point A at the speed of 2000km/s. a)Calculate in J and in eV the kinetic energy of the proton at A. b)Calculate the value of the positive voltage U that should be applied between A and B so that the ...

*Tuesday, May 3, 2016 by vicky*

**Physics**

A bead of mass m = 41.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground

*Tuesday, May 3, 2016 by Dan*

**Physics**

A 3.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 98 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. What is its potential energy after it has swung to position B, 34...

*Tuesday, May 3, 2016 by Dan*

**Physics**

A point mass m = 115 g hangs from a string of length l = 1.07 m. Calculate the value of v, the initial speed m should be given at the bottom, so that the string reaches a maximum angle of = 31.4°?

*Tuesday, May 3, 2016 by Dan*

**Physics**

Consider an archery bow as behaving like a spring with a spring constant of 493 N/m. If an archer pulls the bowstring back for a distance of 42 cm, what is the elastic potential energy of the "loaded" bow? If the mass of the arrow is 39 grams, what is its speed as it leaves ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

By how much will a 1.52 kg object stretch a spring that is suspended vertically if the spring constant is 135 N/m? The object is pulled straight down by an additional distance of 25.4 cm and released from rest. Find the speed with which the object passes through its original ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

Use the following information to calculate the speed of a ball in a pinball machine at a specific location. The ball is launched by using a spring (k = 700 N/m) compressed by 8.5 cm. Consider the starting position of the ball to be its location when the spring is compressed. ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

A bullet (m = 0.0250 kg) is fired with a speed of 94.00 m/s and hits a block (M = 2.20 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. Find the angle (in degrees) through which the block rises, if the strings are 0.200 ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

A fan pushes a beach ball with a force of 10.0 N. If the work done on the ball is 150 J, the distance the ball will travel is ______ m. (Record your answer to the correct number of significant digits)

*Tuesday, May 3, 2016 by Hanny*

**Physics**

A small metal ball with a mass of m = 78.9 g is attached to a string of length l = 1.76 m. It is held at an angle of = 44.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...

*Tuesday, May 3, 2016 by Kevin*

**Physics**

The target box is 2.44 m horizontally from the edge of the table. Bobby compresses the spring 1.42 cm, but the center of the marble falls 84.0 cm short of the center of the box. How far should Rhoda compress the spring to score a direct hit?

*Tuesday, May 3, 2016 by Kevin*

**Physics**

The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)

*Tuesday, May 3, 2016 by Hanny*

**Physics 2**

A particle at the Large Hadron collider in CERN is moving at 0.99 c as it emerges from a collision event. A) If these particles live 2.0 microseconds on average when they are at rest, how long would you expect this particle to last in the reference frame of the physicist ...

*Tuesday, May 3, 2016 by Lexa*

**Physics**

Laser light of wavelength 550 nm falls upon a diffraction grating. The slits are 25 micrometers apart and each have a width of 2 micrometers. There is a screen 2 meters away from the diffraction grating, parallel to the grating. A) At what angle does the m = 1 intensity peak ...

*Tuesday, May 3, 2016 by Lexa*

**Physics**

What is the mass of water in a closed room 5.2m x 6.3m x 2.5m when the temperature is 24 degrees celsius and the relative humidity is 65%?

*Tuesday, May 3, 2016 by Antonia*

**plz help physics**

A proton is moving in vacuum along a straight path from A to B .It passes point A at the speed of 2000km/s. a)Calculate in J and in eV the kinetic energy of the proton at A. b)Calculate the value of the positive voltage U that should be applied between A and B so that the ...

*Tuesday, May 3, 2016 by vicky*

**Physics**

What is the final speed of an object and how far does it travel while accclerating if its initial speed is 10m/s and it accelerates at 8.9m/s squared for 5 s

*Tuesday, May 3, 2016 by Allen*

**physics**

A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20 degrees with the horizontal. If the coefficient of kinetic friction is .40 and the crate is pulled a distance of 5 m, (a...

*Tuesday, May 3, 2016 by wency siatula*

**Physics**

A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard

*Tuesday, May 3, 2016 by Plz help.me*

**Physics**

A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard

*Tuesday, May 3, 2016 by Praneeth*

**Physics**

The part of an iceberg that extends above the water for ice density of 0.9g/cm3 and salted water of 1.1 g/cm3 is

*Monday, May 2, 2016 by JuliePham*

**Physics**

an artist designs a mobile of light horizontal rods connected by vertical strings and supporting various shaped weights. Find the magnitudes w2, w3, and w4 if w1= 1.00 unit of weight. The numerical values given in the figure all have units of length.

*Monday, May 2, 2016 by Jessica*

**Physics**

If a force of 10 N is required to keep a piece of wood 1m under water (density=1g/cm3 ), the force needed to keep it at 2 m under water is:

*Monday, May 2, 2016 by JuliePham*

**Physics**

A horizontal pipe has a part with a diameter 1/3 of the rest of the pipe. If v is the speed of the fluid in the wider section, then the speed in the narrower section is:

*Monday, May 2, 2016 by JuliePham*

**Physics**

A swimmer dives off a block into the water. The block is 31 inches above the surface of the water. Using projectile motion, what angle did they dive to reach point A on the surface of the water? I don't know what the variables stand for in this problem. Xf = Xi + Vixt + 1/...

*Monday, May 2, 2016 by Samantha*

**Physics**

A fighter jet is traveling at 200 m/s following the arc of a vertical circle of radius R. At the top of its path, the pilot experiences “weightlessness.” What is the value of R?

*Monday, May 2, 2016 by Kevin*

**Physics**

A mercury in glass thermometer reads 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

*Monday, May 2, 2016 by Temitope*

**physics**

What quantity of energy is represented by 250cm^3 of a gas 100N.m^2 when the temperature is kept constant

*Monday, May 2, 2016 by thandile*

**Physics**

A block of mass m=25 kg is hung by a massless rope of length L=1.90 m from the ceiling of an elevator. The elevator has a downward acceleration of a=2.20 m/s^2. When the pendulum is set in a small amplitude oscillation, the period T of the pendulum is: A) 2.50s B) 3.14s C) 1....

*Monday, May 2, 2016 by Maddie*

**physics**

to go from town a to b a plane must fly about 1780km at an angle 30° west of north . how far north of A is B ?

*Monday, May 2, 2016 by Anonymous*

**Physics**

A 1.8 kg piece of a metal initially at a temperature of 180oC is dropped into the water with mass of 14 kg. The water is in a container made of the same metal with mass 3.6 kg. The initial temperature of the water and container is 16.0oC, and the final temperature of the ...

*Sunday, May 1, 2016 by Anonymous*

**Physics**

If an electron has a total energy of 5.6 MeV, how would I find the kinetic energy and momentum??

*Sunday, May 1, 2016 by Sam*

**Physics**

A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass? Thanks for ...

*Sunday, May 1, 2016 by Alex*

**Physics**

When a charged particle moves at an angle of 17.0o with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90o) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 2F?

*Sunday, May 1, 2016 by Lily*

**Physics**

A ball of mass m1=3kg moving south at 6m/s collides with a ball of mass m2=2kg initially at rest. The incoming ball is deflected in the direction 60 degrees S of W and the target ball moves off at 25 degrees E of S. Consider that the Collison happens on a horizontal plane and ...

*Sunday, May 1, 2016 by Simon*

**Physics**

A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?

*Sunday, May 1, 2016 by Alex*

**Physics**

An engine works between the two temperatures 200 C and 120 C. Calculate its efficiency in percentage?

*Sunday, May 1, 2016 by Anonymous*

**physics**

A rifle of mass 3.0 kg fires a 15 gram bullet with a muzzle speed of 1.5 km/s. The initial speed of the rifle’s recoil would be ?

*Sunday, May 1, 2016 by Eason*

**physics**

How much work is required to push a crate at constant velocity with a force of 185 N across a floor a distance of 8 m? J How many calories of thermal energy are produced by the friction? cal

*Saturday, April 30, 2016 by Kim*

**Physics**

Three objects are connceted by a massless wires over a frictionless pulley. The right side of the pulley wire is connected to a 15kg block and right below that is a 10kg block on the bottom of the wire. The tension in the wire connecting the 10kg and 15kg objects is measured ...

*Saturday, April 30, 2016 by Alex*

**Physics**

A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?

*Saturday, April 30, 2016 by Alex*

**Physics**

A 50 Kg box rests on a horizontal surface. The coefficient of Static friction between the box and surface is 0.30. The coeffient of Kinetic friction is 0.20. What is the frictional force on the box if a 140 N horizontal push is applied to it. If a 175 N horizontal push is ...

*Saturday, April 30, 2016 by Alex*

**physics**

force has the dependence Fx = -ax4 on the position x, with the constant a = 25.0 N/m4. The work performed by this force when the position of its point of application changes from 0.75 m to 1.25 m is

*Saturday, April 30, 2016 by madhu*

**physics only solve now**

the greatest and least resultant of vectors are 21 N and 7 N respectively.find the two vectors

*Saturday, April 30, 2016 by debashish*

**Physics**

Six charge equal to Q are placed at the corners of regular hexagon of each side x,what is the electric potential at the intersection of the diagonals?

*Saturday, April 30, 2016 by Ankit*

**physics**

a) Two 36 g ice cubes are dropped into 300 g of water in a thermally insulated container. If the water is initially at 19°C, and the ice comes directly from a freezer at -19°C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if only ...

*Friday, April 29, 2016 by ChrismB*

**physics**

A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.

*Friday, April 29, 2016 by Anonymous*

**physics**

A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.

*Friday, April 29, 2016 by Anonymous*

**Physics**

A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.33 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force vector F of magnitude 1.99 N is ...

*Friday, April 29, 2016 by Trish*

**Physics**

A person is driving on a level road and see's a sign 180m ahead in the middle of the road. The person strikes the sign at a speed of 60km/h. If the person was travelling at 90km/h when the sign was first spotted what was the students perception-reaction time? How far back ...

*Friday, April 29, 2016 by momo*

**physics**

a ray enter from denser medium in to air. if angel incident is30 degree and angel of reflection in air 60 degree.find out refractive index of medium ?

*Friday, April 29, 2016 by hina hina*

**physics**

What mass of steam at 100¡ãC must be mixed with 388 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 45.0¡ãC? The specific heat of water is 4186 J/kg¡¤K. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...

*Friday, April 29, 2016 by jes*

**Physics**

A dam 143 m above a hydroelectric generator holds 1.6 x 1015 L of water. If the generator is taken to be at a height of 0 m, how much potential energy is stored in the dam?

*Friday, April 29, 2016 by Megan*

**Physics**

A dense plastic toy of mass 2.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.

*Thursday, April 28, 2016 by Kitty*

**physics**

Consider a star with a mass of 8.7 x 1031 kg. Determine the radius of the star if a typical star has a density of 1400 kg/m3.

*Thursday, April 28, 2016 by Abby*

**Physics**

NASA wants to build a centrifuge to train its astronauts to handle the strong accelerations they will experience when the space shuttle lifts off. A composite material capable of withstanding a normal force of 120000N without rupturing is used to manufacture the base of the ...

*Thursday, April 28, 2016 by Kid*

**Physics**

An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. Determine the...

*Thursday, April 28, 2016 by Jen*

**Physics**

A machine gun fires 10 rounds per second. The speed of the bullets is 300m/s. 9.What is the distance in the air between the flying bullets?

*Thursday, April 28, 2016 by Mero*

**Physics help Rolling Motion!!**

A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ...

*Thursday, April 28, 2016 by Samantha*

**physics**

A Boeing 747 “Jumbo Jet” has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the inter- section is 25.0 m. The plane decelerates through the intersection at a rate of 6.1 m/s2 and clears it with a final speed of 45.0 m/s. How...

*Thursday, April 28, 2016 by Arthur*

**Physics**

A boy with a mass of 40kg is seated a distance of 3.0m from the fulcrum of a seesaw. a. Calculate the load force exerted by the boy (Hint: What force is pulling him down?) b. Calculate the torque exerted by the boy. c. If his sister with a mass of 24 kg wants to balance the ...

*Thursday, April 28, 2016 by Rick*

**Physics**

An object attached to a 0.5 m string completes 4 rotations in one second. find the linear velocity(m/s) and the angular velocity(rad/s).

*Thursday, April 28, 2016 by Anonymous*

**Physics**

The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is _______ s.

*Thursday, April 28, 2016 by Hanny*

**Physics**

A 0.50 kg mass is attached to the end of a string swing in a vertical circle(radius=2.0m). When the sting is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

*Thursday, April 28, 2016 by Anonymous*

**Physics**

I want to know how they found out the value of G

*Thursday, April 28, 2016 by Akhter*

**Physics help**

how much more intense is 75 db compared to 25 db

*Thursday, April 28, 2016 by Anonymous*