Monday

September 1, 2014

September 1, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure below gives their velocities v as functions of time t as the conductors slow the trains. The slowing processes begin when the trains are 265 m apart. What is ...
*Monday, September 1, 2014 at 4:28pm*

**physics**

The brakes on your automobile are capable of creating acceleration of 14 ft/s2. If you are going 66 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr?
*Monday, September 1, 2014 at 4:06pm*

**physics**

Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.) I think i am suppose to use E=kQ/r^2 . ...
*Monday, September 1, 2014 at 3:40pm*

**physics**

Three point charges are fixed in place in a right triangle. What is the electric force on the q = -0.7 µC charge due to the other two charges? (Let Q1 = +0.79 µC and Q2 = +1.5 µC.)
*Monday, September 1, 2014 at 3:06pm*

**Physics**

What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m Physics - Damon, Monday, September 1, 2014 at 6:51am Vi = 60 km/h (1 h/3600 s)(1000 m/km) v = Vi + a t 0 = Vi + a t t = -Vi/a d = Vi t + (1/2) a t^2 25...
*Monday, September 1, 2014 at 6:56am*

**Physics**

What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m
*Monday, September 1, 2014 at 6:42am*

**science, physics**

Calculate the final temperature. Two kg ice at zerodegree celsius is mixed with 8 kg of water at 20 degree celsius.
*Monday, September 1, 2014 at 4:24am*

**physics**

(A).32J(B).46J(C).61J(D).102J
*Sunday, August 31, 2014 at 8:20pm*

**physics**

(A).3.3KW(B).0.33KW(C).3.3KW(D).3.3kw
*Sunday, August 31, 2014 at 8:16pm*

**physics**

(A).8k/3(B).32k(C).64/3(D).128k/3
*Sunday, August 31, 2014 at 8:11pm*

**physics**

(A).1200kW (B).120KW (C).12KW (D).1.2KW
*Sunday, August 31, 2014 at 8:05pm*

**Physics-Electricity**

Consider three charged particles placed along the x-axis. The particle with q1 = 9.30 nC is at x = 6.87 m and q2 = 4.09 nC is at x = 0.600 m. Where must a positive charge, q3, be placed such that the resultant force on it is zero? x=?m
*Sunday, August 31, 2014 at 5:13pm*

**physics**

a bullet fired into a target loses half its velocity after penetrating 25cm.How much further will it penetrate before coming to rest ?
*Sunday, August 31, 2014 at 2:26pm*

**physics**

a long spring is stretched by 2cm. P.E is u if the spring is stretched by 10cm, the P.E is stored in it will be
*Sunday, August 31, 2014 at 2:20pm*

**physics**

a man of 1kg is acted upon a single force Fvector=(4i+4j)N.Due to force, mass is (D,0) to(1m,1m).If initially the speed of the particle 2m/s.Its final speed showd approximately be ?
*Sunday, August 31, 2014 at 2:14pm*

**physics**

power applied to a particle varies with times as p=3t^2-2t+1 Watt where t is in second. And the change in its kinetic energy b/w time t=2s t=4s
*Sunday, August 31, 2014 at 2:00pm*

**physics**

an engine pumps of 100 kg of water through a height of 10m in 5 second. Given that the efficiency of engine is 60%. If g=10m/s^2 the power of engine is
*Sunday, August 31, 2014 at 1:50pm*

**physics**

a particle moves under the effect of force f2 from x=0 to x=4 of the work done by force
*Sunday, August 31, 2014 at 1:39pm*

**physics**

A ball is dropped a high cliff, and two second later another ball was thrown vertically downwards with an initial speed of 30 m/s.How long will it take the second ball to overtake the first?
*Sunday, August 31, 2014 at 12:43pm*

**Physics**

Suppose gold bars are made such that they are cubic. If they are made cubic, then there volume is given by V = L3, where L is the length of a side of the bar. The price of any gold bar is directly proportional to its volume, so the price of the gold is P = c V, where c is some...
*Sunday, August 31, 2014 at 11:15am*

**Physics**

Suppose someone invents completely new units where 1 zig = 0.18 zags and 1 zoyear = 0.4 years (typical years, as in 365 days). Convert 585 zag/zoyear to zig/hour.
*Sunday, August 31, 2014 at 11:14am*

**Physics**

A curve in a road 8m wide has a radius of 60 m. How much higher than its inner edge should be the other edge of the road be if it is to be bunked properly at 20 km/hr?
*Sunday, August 31, 2014 at 7:14am*

**physics.**

a cube is on a smooth horizontal force of mass m.a horizontal force is applied at its top.the maximum acceleration of cube without toppling
*Sunday, August 31, 2014 at 3:45am*

**physics : friction**

a man pushes a packing case which has a total mass of 50 kg across a floor at a constant speed of 0.4 m s-1 by exerting a horizontal force of 100 N. (a) what was the resultant force on the case? > F = ma F = 50 * 0 F =0 (b) what was the frictional force acting on the case...
*Sunday, August 31, 2014 at 1:07am*

**physics**

A mass of 9 kg while descending vertically down, drags up a mass of 6 kg by means of a string passing over a smooth pulley . find the acceleration of the system and tension in the string
*Sunday, August 31, 2014 at 12:25am*

**physics**

Find the force when two poles to strength 100 and 90 cgs units are placed at a distance to 20 cm a part.
*Sunday, August 31, 2014 at 12:11am*

**physics**

A standard 1 kilogram weight is a cylinder 48.5 mm in height and 52.0 mm in diameter. What is the density of the material?
*Saturday, August 30, 2014 at 10:35pm*

**Physics**

You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Here's the step by step from the book that I'm ...
*Saturday, August 30, 2014 at 10:24pm*

**PHYSICS**

You push your physics book 2.20m along a horizontal tabletop with a horizontal push of 2.20N while the opposing force of friction is 0.500N . How much work does your 2.20N push do on the book? How much work does the friction force do on the book? How much work does the normal ...
*Saturday, August 30, 2014 at 9:54pm*

**Physics**

I know I need to show my work but the problem is that I don't even know where to begin. I am taking an online physics class with a teacher that is not willing to help. So any guidance would be much appreciated. Consider the two vectors: F1: (220N, 41°), F2: (50N, 139&...
*Saturday, August 30, 2014 at 8:55pm*

**Physics**

You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Answer key shows x component is 8.0, y component is 6.1...
*Saturday, August 30, 2014 at 6:32pm*

**Physics **

What alterations could be done to make the speedometer into a velocimeter? Thanks!
*Saturday, August 30, 2014 at 3:34pm*

**physics**

A car has an initial velocity of 20 m/s to the right, 17 seconds later it is seen to be moving at 46 m/s to the left. WHAT DISTANCE DID IT TRAVEL? Does the 17 seconds include the initial 20m/s? If not, how do I find the other distance. If so... What do I do. Sorry I am in a ...
*Saturday, August 30, 2014 at 3:29pm*

**physics**

A ball is dropped into a well. A splash is heard 43 seconds later. The speed of sound (the speed at which sound travels through the air) is 345 m/s. HOW DEEP WAS THE WELL? I don't even know which equation to plug this into. At first I just tried s=d/t-> 345=d/43, but ...
*Saturday, August 30, 2014 at 3:25pm*

**physics**

A Bulldog is already moving when we first see it. It waddles -57 meters reaching a final velocity of -28 m/s after accelerating at -4 m/s2. WHAT WAS THE DOG'S INITIAL VELOCITY? Every time I try to use v^2= V0+2a(delta x) I end up getting a very big value. Could you help me...
*Saturday, August 30, 2014 at 3:23pm*

**physics**

A student tools along in his new Vette weaving in and out of slow traffic, overtaking little kids boarding the school bus, passing school zones without a second glance, cutting off ambulances and fire trucks, running yellow lights, red lights, yield signs, and stop signs ...
*Saturday, August 30, 2014 at 3:22pm*

**physics**

Suppose a 69-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
*Saturday, August 30, 2014 at 3:13pm*

**Physics **

write a general equation describing the position at any time of an object starting from some position x0 moving with velocity v.
*Saturday, August 30, 2014 at 3:11pm*

**Physics **

The plane tectonic theory describes the motion of the continents across the face of Earth. Measurements suggest that Africa and South America were once connected and are drifting apart at an average rate of 3cm/yr. If the two continents are now 7x10^8 cm apart, how long has ...
*Saturday, August 30, 2014 at 11:28am*

**physics**

Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time. What was the initial velocity of Jill's rock? Assume upward is ...
*Saturday, August 30, 2014 at 11:25am*

**Physics Help!!!!**

A runner in a relay race runs 20m north, turns around and runs south for 30 m, then turns north again and runs 40m. the entire run took 30 seconds. what was the average speed of the runner? what was the average velocity of the runner?
*Saturday, August 30, 2014 at 11:24am*

**Physics **

A forklift driver at the Acme W&W warehouse drives a forklift from the main entrance to a loading dock 20m away. He then turns back towards the entrance and drives 13m to pick up a pallet of equipment. Finally, he turns back towards the loading dock, drives 10m and deposits ...
*Saturday, August 30, 2014 at 11:19am*

**Physics**

A 0.250-kg block of a pure material is heated from 20.0°C to 65.0°C by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.
*Saturday, August 30, 2014 at 11:02am*

**physics**

A 1.30kg kg box and a 3.80kg kg box on a perfectly smooth horizontal floor have a spring of force constant 300N/m N/m compressed between them. The initial compression of the spring is 5.00cm cm . Part A Find the acceleration of 1.30kg kg box the instant after they are released...
*Saturday, August 30, 2014 at 9:51am*

**physics**

A blue ball is thrown upward with an initial speed of 24.1 m/s, from a height of 0.6 meters above the ground. 2.9 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.5 m/s from a height of 31.8 meters above the ground. The force of ...
*Saturday, August 30, 2014 at 12:19am*

**Physics**

What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r=4.84±0.05m? I keep getting 6% and it says i am wrong.
*Friday, August 29, 2014 at 9:44pm*

**Physics**

What is the magnitude of the electric force between a proton and an electron when they are at a distance of 2.63 Angstrom from each other?
*Friday, August 29, 2014 at 7:57pm*

**physics**

an adult elephant has an average shoulder height of 350 cm and average mass of 5,7000 kg. If an elephant initially at rest was to be lifted by a cable to a height of 20 m (a) What is the tension in the cable if the elephant is accelerating upwards at rate of 1.5 m/s²? (b...
*Friday, August 29, 2014 at 7:47pm*

**Physics**

1 Angstrom = how many Coulombs?
*Friday, August 29, 2014 at 7:39pm*

**Physics Electricity and Magnetism**

A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in the equation? ...
*Friday, August 29, 2014 at 7:28pm*

**physics**

convert 1micro A TO mA answer: 1*10^-6A *10^-3m =1*10^-9mA
*Friday, August 29, 2014 at 5:50pm*

**Physics**

Can someone please explain the method to solving the following electrostatics problem? Thank you very much. Consider three charged sheets, A,B, and C. The sheets are parallel with A above B above C. On each sheet there is a surface charge of uniform density: –4 x 10^(-5) ...
*Friday, August 29, 2014 at 2:49pm*

**physics**

a block of mass 0,5kg is attached to a spring .The spring is compressed to a distance of0,1m.The block is released .The block moves 0,07m past the equilibrium position .What is the force of friction that does work on the block. spring constant is 500
*Friday, August 29, 2014 at 1:00pm*

**physics**

a block of mass 0,5kg is attached to a spring.The spring is compressed to a distance of 0,1m .The block is released .The block moves 0.07m past the eequilibrium position .What is the force of friction that does work on the block? spring const is 500. F -kx -500 x .07
*Friday, August 29, 2014 at 12:44pm*

**physics 12**

A hollow sphere us charged to 14uc .Find the potential(a) at its surface (b) inside the sphere (c) at a distance of 0.2m from the surface.The radius of sphere is 0.3 m
*Friday, August 29, 2014 at 11:58am*

**physics**

Two positive point charges of 15 into 10^-10 C and 13 into 10^-10 C are placed 12cm apart.Find the work done in bringing the two charges 4cm closer ?
*Friday, August 29, 2014 at 11:51am*

**Physics**

Each crate moves from position 1, to position 2 to position 3. All of the crates are identical. the coordinate values given are in meters. Rank A through F in order from least to greatest, on the basis of the displacement from the position 1. If any crates traveled the same ...
*Friday, August 29, 2014 at 10:57am*

**physics**

A daredevil is shot out of a cannon at 36.5◦ to the horizontal with an initial speed of 36.1 m/s. A net is positioned a horizontal distance of 25.7 m from the cannon. At whatheight abovethecannon shouldthe net be placed in order to catch the daredevil? The acceleration ...
*Thursday, August 28, 2014 at 8:48pm*

**Physics**

Each crate moves from position 1, to position 2 to position 3. All of the crates are identical. the coordinate values given are in meters. Rank A through F in order from least to greatest, on the basis of the displacement from the position 1. If any crates traveled the same ...
*Thursday, August 28, 2014 at 6:49pm*

**Physics ... **

116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
*Thursday, August 28, 2014 at 5:13pm*

**Physics**

A constructor on worker assisting in the paving of a street drives a heavy roller back and forth over the newly paved area to smooth the asphalt. The section of street being paved is 100 m long and the roller operator drives from the east end to the west end of the street and ...
*Thursday, August 28, 2014 at 4:23pm*

**Physics**

Maria is undergoing physical therapy for a back injury. Her therapist instructs her to use the power-glide incline. When using the incline, Maria pushes with her legs, raising her torso 30 cm up the incline and then she release to drop back down again. She is instructed to ...
*Thursday, August 28, 2014 at 4:15pm*

**physics**

how does the center of gravity affect posture? answer...when a person is carring a load a center of gravity changes to increase stability that person will bent
*Thursday, August 28, 2014 at 3:48pm*

**Intro Physics Help **

A runner in a relay race is required to run a distance of 20 m, pick up tbaton, and then turn back to the start. the runner must then run back past the starting point to a location 10 m beyond start, pick up a second baton, turn around and run past start again to a second ...
*Thursday, August 28, 2014 at 3:45pm*

**physics**

An unstrained horizontal spring has a length of 0.33 m and a spring constant of 209 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring stretches by 0.021 m relative...
*Thursday, August 28, 2014 at 12:02pm*

**Physics**

Suppose gold bars are made such that they are cubic. If they are made cubic, then there volume is given by V = L3, where L is the length of a side of the bar. The price of any gold bar is directly proportional to its volume, so the price of the gold is P = c V, where c is some...
*Thursday, August 28, 2014 at 11:57am*

**Physics**

A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
*Thursday, August 28, 2014 at 11:26am*

**physics**

convert 2*10^20am answer 2*10^20*10^-18=2*10^2m
*Thursday, August 28, 2014 at 10:57am*

**physics**

convert 2*10^20 am answer 2*10^20*10^-18=2*10^2m
*Thursday, August 28, 2014 at 10:52am*

**12th Grade Physics**

Ben pulls a rope that is attached to a wagon with a magnitude of 300N. He pulls it in a way that te rope is at an angle of 30 degrees from the horizontal. The mass of the wagon is 2kg and the mass of Mike, who sits on the wagon, is 20kg. While the wagon moves to the right, the...
*Thursday, August 28, 2014 at 10:35am*

**physics**

convert 6.5*10^-3 g.cm/h to kg m/s 6.5*10^-3*10^-2/3600s=1.8*10^-8
*Thursday, August 28, 2014 at 10:25am*

** physics**

The pressure of a gas in a container is estimated to be the force exerted per cross-sectional area. If a factor F=(20.0+/-0.5)N.acts on a rectangular cross-section of the container with dimensions x=(5.0+/-0.5). Calculate fractional change in pressure and percentage error in ...
*Thursday, August 28, 2014 at 2:53am*

**physics**

A child is pushing a shopping cart at a speed of 0.7 m/s. How long will it take the child to push the cart down an aisle with a length of 17.3 m? (Answer in seconds)
*Wednesday, August 27, 2014 at 11:58pm*

**physics**

a constant rrtarding force of50N is applied to a body of mass 20 kg moving initially with speed of 15 ms-1.How long does the body take to stop?
*Wednesday, August 27, 2014 at 11:49pm*

**Physics**

From the top of a cliff with 80 m height a stone is thrown vertically and finally hit the surface of ocean. Initial velocity of stone is 40 m/s. Find: (a) time to reach to max height. (b) how high goes from surface of ocean? (c) what is velocity of stone 2 second after thrown...
*Wednesday, August 27, 2014 at 8:52pm*

**Physics**

Hello, I don't understand how to do part "d" of the question. Can someone please explain it to me step by step? Do I use the 2nd equation to solve it? Using one of the following formulas: 1. Vy = g * t + Voy 2. y = 1/2 * g * t^2 + Voy * t 3. Vy^2 = Vo^2 * g + 2...
*Wednesday, August 27, 2014 at 8:44pm*

**Physics**

Here is a simple example. The inhabitants of a small island begin exporting beautiful cloth made from a rare plant that grows only on their island. Seeing how popular the small quantity that they export has been, they steadily raise their prices. A clothing maker from New York...
*Wednesday, August 27, 2014 at 7:59pm*

**Physics **

a boy and a girl carry a 12 kg bucket of water by holding the ends of the rope with the bucket attached in the middle. if there is a angle of 100 degrees between the two segments of the rope ; what is the tension of each part?
*Wednesday, August 27, 2014 at 7:40pm*

**physics**

An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 2.84 m/s2. The magnitude of the car's velocity at the end of ...
*Wednesday, August 27, 2014 at 5:49pm*

**physics**

An airplane travels 200 km/h through the air. If it heads directly against a 40- km/h wind, what is its speed relative to the ground?
*Wednesday, August 27, 2014 at 4:25pm*

**physics **

116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
*Wednesday, August 27, 2014 at 1:20pm*

**Physics**

Determine the magnitude of the vector sum V=V1+V2 and the angle theta(x) which V makes counterclockwise from the positive x-axis. V1 = 34 units and makes a 20 degree angle with the +x axis V2 = 28 units and forms a 3,4,5 triangle with the -x axis
*Wednesday, August 27, 2014 at 9:16am*

**Physics**

Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...
*Wednesday, August 27, 2014 at 3:00am*

**physics**

the diameter of the moon is 3480 km. A.)what is the surface area of the moon? B.)how many times larger is the surface area of earth?
*Wednesday, August 27, 2014 at 12:07am*

**Physics**

Determine the magnitude of the vector sum V=V1+V2 and the angle theta(x) which V makes counterclockwise from the positive x-axis. V1 = 34 units and makes a 20 degree angle with the +x axis V2 = 28 units and forms a 3,4,5 triangle with the -x axis
*Tuesday, August 26, 2014 at 10:29pm*

**physics**

Vector has a magnitude of 136 units and points 35.0 ° north of west. Vector points 69.0 ° east of north. Vector points 19.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b...
*Tuesday, August 26, 2014 at 5:27pm*

**physics**

You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?
*Tuesday, August 26, 2014 at 2:03pm*

**Physics**

If a car is accelerating, is the car's velocity constant. Please sentence explanation.
*Tuesday, August 26, 2014 at 1:10pm*

**Physics**

If toy rocket rises vertically and then falls back to the ground, what changes occur in the rocket's velocity and acceleration. Please give a sentence explanation not a formula
*Tuesday, August 26, 2014 at 12:37pm*

**physics**

What's the net force acting on an 18-kg object if an acceleration of 3.0 m/s2 is produced? A. 54 N B. 12 N C. 6 N D. 36 N
*Tuesday, August 26, 2014 at 12:37pm*

**Physics**

The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
*Tuesday, August 26, 2014 at 7:17am*

**physics**

A person whose eyes are 2.87 m above the floor stands 2.11 m in front of a vertical plane mirror whose bottom edge is 41 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen ...
*Tuesday, August 26, 2014 at 5:12am*

**physics**

A CRICKET BALL OF MASS 0.4kg MOVING WITH A VELOCITY OF 72km/h IS BROUGHT TO REST BY A PLAYER . WHAT IS THE MAGNITUDE OF THE AVERAGE FORCE EXERTED BY THE PLAYER?
*Monday, August 25, 2014 at 11:53pm*

**Physics**

David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?
*Monday, August 25, 2014 at 10:21pm*

**Physics**

02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his mass is 107 kg, what ...
*Monday, August 25, 2014 at 10:20pm*

**Physics**

wo objects each have a positive charge. The total charge on both objects is 365 µC. When the objects are placed a distance of 1.30 m apart, each exerts an electrostatic force of 24.3 N on the other. What is the charge on each object? (Give your answers in µC.)
*Monday, August 25, 2014 at 9:30pm*

**Physics**

Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.
*Monday, August 25, 2014 at 8:31pm*

**Physics**

Given an angle of 30 degrees, find the minimum initial speed of a cannon ball that travels in a horizontal distance of 15000 mi.
*Monday, August 25, 2014 at 2:20pm*

**Physics**

A ball thrown by a boy in the street is caught 5 s later by another boy on the balcony of the house 10 m away and 3 m above the street level. What is the initial speed of the ball? What is the angle above the horizontal at which it was thrown?
*Monday, August 25, 2014 at 2:18pm*

**Physics**

The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
*Monday, August 25, 2014 at 1:17pm*

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