Thursday

November 26, 2015
**Physics URGENT**

Object 1 (mass=6.4 kg) traveling in the +x direction at a speed of 14.01m/s undergoes an inelastic collision with Object 2 (mass=5.10kg) which is at rest. Object two flies off at a speed of 11.94m/s and an angle θ2=49.8 °. The diagram below is just a sketch and is not...
*Thursday, October 22, 2015 by Nick URGENT*

**physics **

Two students are on a balcony that is 15 m above the ground. One student throws a ball vertically downward with an initial velocity of 12 m/s. Another student throws a ball upward at the same time with exactly the same speed. Both Balls eventually hit the ground below the ...
*Thursday, October 22, 2015 by Kiki*

**physics**

Some nucleus of 74X189 (atomic mass = 188.96191 u) undergoes - decay to become 75X189 (atomic mass = 188.95922 u). What is the energy (in MeV) released in this process?
*Thursday, October 22, 2015 by james*

**physics**

The number of radioactive nuclei present at the start of an experiment is 3.27 x 1015. The number present twenty days later is 7.66 x 1014. What is the half-life (in days) of the nuclei?
*Thursday, October 22, 2015 by james*

**physics is this correct**

What is the radius of a real or imaginary nucleus of 46X100 do I use the formula R = R_o * A^(1/3) and therefore (1.3*10^-15)* 100^(1/3) =6.0340655e-15?
*Thursday, October 22, 2015 by james*

**physics**

The refractive indices of materials A and B have a ratio of nA/nB = 1.68. The speed of light in material A is 1.26 x 108 m/s. What is the speed of light in material B
*Thursday, October 22, 2015 by james*

**physics**

An object is located 27.6 cm to the left of a converging lens whose focal length is 46.5 cm. (a) Determine the image distance and (b) the magnification.
*Thursday, October 22, 2015 by james*

**PHYSICS NEED HELP**

A bicyclist can coast down a 5° hill at a constant 6.0 km/h. Assume the force of friction (air resistance) is proportional to the speed v so that Ffr = cv. (a) Calculate the value of the constant c. (b) What is the average force that must be applied in order to descend the...
*Thursday, October 22, 2015 by Manny*

**Physics **

Carlos is in an roof of a building of 20 meters tall, he throws a tennis ball vertically upwards at 15 m/s velocity after it reaches its highest height, the ball goes down until it reaches the ground (see the figure). Based on this information, answer the following. a) Time ...
*Thursday, October 22, 2015 by Anonymous*

**Physics **

Mary throws a ball from her balcony downwards as it is shown in the figure. How long does it take to reach the ground? What is the balcony height?
*Thursday, October 22, 2015 by Anonymous*

**physics**

A tennis player standing 13.9 m from the net hits the ball at 3.40° above the horizontal. To clear the net, the ball must rise at least 0.449 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet?
*Wednesday, October 21, 2015 by Anonymous*

**Physics **

Carlos is in an roof of a building of 20 meters tall, he throws a tennis ball vertically upwards at 15 m/s velocity after it reaches its highest height, the ball goes down until it reaches the ground (see the figure). Based on this information, answer the following. a) Time ...
*Wednesday, October 21, 2015 by Flores*

**physics**

Juan was on vacation in Italy, and one of this adventures, he went up the Pisa tower. He wants to know the tower height using Physics, so he drops a small stone that he has in his pocket and takes the time it lasts to reach the ground. What is the Pisa tower height according ...
*Wednesday, October 21, 2015 by Flores*

**Physics**

The following conversion equivalents are given 1m=100th 1in=2,5th 1ft=12th A bin has a volume of 1.5 to the 3rd power. The volume of the bin, in ft to the 3rd power, is closet to
*Wednesday, October 21, 2015 by Neaka*

**PHYSICS **

A salesperson leaves the office and drives 26 km north along a straight highway. A turn is made onto a highway that leads in a direction of 60 degrees. The driver continues on the highway for a distance of 62 km and then stops. What is the total displacement of the salesperson...
*Wednesday, October 21, 2015 by Madison*

**physics**

During lab students are asked to set up the Atwood's device shown in the diagram below. Mass 1 = 4.50 kg and mass 2 = 2.10 kg. If the distance to the floor, S = 1.20 meters, how much time is needed for mass 1 to reach the floor? please explain how to do this; i dont know how
*Wednesday, October 21, 2015 by anon*

**physics**

In the Atwood machine shown in Figure 5.14a, m1 = 2.00 kg and m2 = 8.00 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push that sets it into ...
*Wednesday, October 21, 2015 by Janice*

**Physics- PLEASE HELP!!**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??
*Wednesday, October 21, 2015 by Hannah*

**physics **

A salesperson leaves the office and drives 26 km north along a straight highway. A turn is made onto a highway that leads in a direction of 60 degrees. The driver continues on the highway for a distance of 62 km and then stops. What is the total displacement of the salesperson...
*Wednesday, October 21, 2015 by Sooners41*

**Quick physics check**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??
*Wednesday, October 21, 2015 by Hannah*

**Physics**

If a ball has a weight of 6.8N what is the centripetal force of the string
*Wednesday, October 21, 2015 by Student*

**Physics**

A bullet of mass 15 g is fired with an initial speed of 287 m/s into a wooden block that is initially at rest. The bullet becomes lodged in the block, and the bullet and block then slide together on the floor for a distance of 1.4 m before coming to rest .If the coefficient of...
*Wednesday, October 21, 2015 by Wrenn*

**Physics **

A 100 grams of bullet is fired from a 10 kg with a speed of 1000 m/s. What is the speed of the recoil of the gun?
*Wednesday, October 21, 2015 by Anonymous *

**Physics**

You know you should not have bought the "MRI in a Box" kit from the Home Shopping Channel. Its main solenoid is supposed to have a radius of r=0.28 m, a length of L=0.1 m, and 12000 windings. The wire they give you has a resistance of 13 mΩ per meter. With only...
*Wednesday, October 21, 2015 by Anonymous*

**Physics**

From what height would a car weighing 9990 N have to fall to gain the kinetic energy equivalent to what it would have when traveling 64.87 mi/hr?
*Wednesday, October 21, 2015 by Julia*

**Physics **

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...
*Wednesday, October 21, 2015 by Dani*

**Physics **

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...
*Wednesday, October 21, 2015 by Dani*

**Physics**

How much energy is released when 250 kg of anthracite coal burns
*Wednesday, October 21, 2015 by Alikhan*

**Physics**

a body of mass m hung in a particular spring execute shm if period 1seconds What period would be obtained? a,using a body of mass 4m?
*Wednesday, October 21, 2015 by Eryk*

**physics formula check please**

A mirror produces an image that is located 28.0 cm behind the mirror, when the object is located 9.90 cm in front of the mirror. (a) What is the focal length of the mirror? (b) Is the mirror 1 - concave or 2 - convex? (Give the number of the correct answer.) The refractive ...
*Wednesday, October 21, 2015 by james*

**Physics please help**

An object that is 31 cm in front of a convex mirror has an image located 16 cm behind the mirror. How far behind the mirror is the image located when the object is 24 cm in front of the mirror? do I use the formula 1/f = 1/di + 1/do?? please help
*Wednesday, October 21, 2015 by james*

**Physics**

What is electric potential
*Wednesday, October 21, 2015 by Eryk*

**Physics**

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16 m, his speed is 5.0 m/s. His mass, including the propulsion unit, has the approximately constant value of ...
*Wednesday, October 21, 2015 by Kristen*

**physics**

A 66 kg man's arm, including the hand, can be modeled as a 78-cm-long uniform cylinder with a mass of 3.6 kg . In raising both his arms, from hanging down to straight up, by how much does he raise his center of gravity?
*Tuesday, October 20, 2015 by Anonymous*

**physics**

what is the molar specific pressure at constant volume
*Tuesday, October 20, 2015 by akin*

**physics 11**

A swimmer swims perpendicular to the bank of a 20.0 m wide river at a velocity of 1.3 m/s. Suppose the river has a current of 2.7 m/s [W]. (a) How long does it take the swimmer to reach the other shore? (b) How far downstream does the swimmer land from his intended location?
*Tuesday, October 20, 2015 by eric*

**Physics help**

A plane flies 230 mph at 60 degrees north of west for 2.5 hours. Answer the following questions. A. How far did it travel total? B. How far west did it go? C. How far north did it go? D. How fast did it go west? I don't know how to do this problem :(
*Tuesday, October 20, 2015 by Hannah*

**Physics**

Two particles are fixed to an x axis: particle 1 of charge q1 = 1.73 ¡Ñ 10-8 C at x = 30.0 cm and particle 2 of charge q2 = -4.41q1 at x = 78.0 cm. At what coordinate on the x axis is the electric field produced by the particles equal to zero?
*Tuesday, October 20, 2015 by Anonymous*

**physics **

A truck loaded with sand accelerates along a highway. The driving force on the truck remains constant. What happens to the acceleration of the truck as its trailer leaks sand at a constant rate through a hole in its bottom?
*Tuesday, October 20, 2015 by mo*

**Physics (A-level) **

A ball was projected horizontally at a speed of 0.52 m s–1 across the top of an inclined board of width 600 mm and length 1200 mm. It reached the bottom of the board 0.9 s later (Figure 4). Calculate: a the distance travelled by the ball across the board, b its ...
*Tuesday, October 20, 2015 by Jeffrey Jones*

**physics**

If the rope pulling on the leg exerts a 120-N force on it, how massive should be the block hanging from the rope that passes over the pulley?
*Tuesday, October 20, 2015 by thissa*

**Physics**

Help!?!?! A pontoon boat starts from rest and accelerates at a constant rate of 0.25m/s^2 over a displacement of 290 meters. 1. Find the magnitude of the boats final velocity? 2. Find the time it takes the boat to travel this displacement.
*Tuesday, October 20, 2015 by Mike*

**PHYsics URGENT**

a 7.0 kg object weighs 55 N when submerged and weighed in water. A) what is the value of the buoyant force of the water on the object b) what weight of water is displaced by this object? c) water weighs 0.0098 N per cubic centimeter. What volume of water (in cubic centimeters...
*Tuesday, October 20, 2015 by sammie *

**College Physics**

A 1670 kg car rolling on a horizontal surface has a speed of 80 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 6.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.) Now I've ...
*Tuesday, October 20, 2015 by Keya*

**Physics **

A 400.0 KG mass experiences a horizontal push force of +720N And friction force of 320N A) assuming the mass is initially moving at 5.0 m/s far will it travel in 6.0 s? B) how much work does the 720.0 newton force do over the distance determine in part a? C) calculate the ...
*Tuesday, October 20, 2015 by Anonymous*

**Physics **

A 400.0 KG mass experiences a horizontal push force of +720N And friction force of 320N A) assuming the mass is initially moving at 5.0 m/s far will it travel in 6.0 s? B) how much work does the 720.0 newton force do over the distance determine in part a? C) calculate the ...
*Tuesday, October 20, 2015 by Anonymous*

**Physics. Appreciate the help I can get.**

A 400.0 kg mass experiences a horizontal push force of +720 N and a friction force of 320 N. A) assuming the mass is initially moving at 5.0 m/s how far will it travel in 6.0s? B) how much work does the 720.0 Newton force do over the distance determined in part (a) C) ...
*Tuesday, October 20, 2015 by Jenny *

**Physics please help **

A) Use the principle of conservation of energy to calculate the maximum height reached by a projectile shot straight up from ground level with a speed of 120.0 m/s B) What real force (a manifestation of one of the fundamental four forces) would cause the actual maximum height ...
*Tuesday, October 20, 2015 by Jenny *

**Physics**

Holding a long rope by its upper end, you lower it onto a scale. The rope has a mass of 0.160 kg per meter of length, and is lowered onto the scale at the constant rate of 1.30 m/s. (1) Calculate thrust. (2) At the instant when the amount of rope at rest on the scale has a ...
*Tuesday, October 20, 2015 by Jen*

**Physics 101 **

Calculate the increase in length of a 250.00 meter long concrete bridge if it's temperature increases from 10.0°C to 39.0 °C? The coefficient of expansion of concrete is 9.8 X 10^-6 (1/°C)
*Tuesday, October 20, 2015 by Haley*

**physics**

calculate the work done on n mole of a vander waal gas is an isothermal expansion from volume vi to vf.
*Tuesday, October 20, 2015 by abdulmueed*

**Physics 101 **

Calculate the increase in length of a 250.00 meter long concrete bridge if it's temperature increases from 10.0°C to 39.0 °C? The coefficient of expansion of concrete is 9.8 X 10^-6 (1/°C)
*Tuesday, October 20, 2015 by Haley*

**AP physics**

A child on a sled reaches the bottom of a hill with a velocity of 10.0m/s and travels 25.0m along a horizontal straightaway to a stop. If the child and sled together have a mass of 60kg, what is the average retarding force on the sled on the horizontal straightaway?.
*Tuesday, October 20, 2015 by jide tayo*

**PHYsics 101**

How much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22°C to 252°C unit of answer must be Joule
*Tuesday, October 20, 2015 by Sammie*

**Physics please help me (:**

Calculate the change in internal energy of a system if 25000 J of heat is added to the system while the system does 40000 J of work on its surroundings. Does this represent an increase or decrease of internal energy?
*Tuesday, October 20, 2015 by Sammie*

**Physics **

400 grams of a metal at 300 C is added to 100 grams of of water at 20 C. Assuming all the heat lost by the metal is gained by the water and that the final temperature or water and metal is 95 C, calculate the specific heat of the metal. Using grams and degrees C, the specific ...
*Tuesday, October 20, 2015 by Sammie*

**Physics 101 help (dumb it down please)**

A 12,000 kg truck moving to the right at 22 m/s collides with and sticks to a 1200 kg car moving to the right at 16 m/s. What speed do the two vehicles move after the collision in what direction Also Calculate the Kinetic energy converted to heat sound and instructive work in ...
*Tuesday, October 20, 2015 by Haley*

**Physics 101 (I'm stupid)!**

And Astronaut wearing an environment suit has a total mass of 130 kg. What is his weight on earth? What would his weight be on Mars where the acceleration of gravity is 3.26? What is his mass on Mars? Why? If he should end up adrift and deep space what what his mask be? Why?
*Tuesday, October 20, 2015 by Haley*

**PHYSICS**

A car is travelling at 60km/h when applies his brakes.If the car decelerates uniformly at 5.6m/s2,how far does the car go after the brakes are applied before coming to rest?
*Monday, October 19, 2015 by HEJUMACLA*

**PHYSICS**

A car of mass 1100kg starts from rest on a level road and reaches the speed of 50.4km/h in 10s. i)what is the magnitude of acceleration of the car in m/s2? i)How far did the car travel in this time?
*Monday, October 19, 2015 by HEJUMACLA*

**Physics**

An electron has an initial speed of 4.00×106 m/s. What potential difference (sign and magnitude) is required to bring the electron to rest?
*Monday, October 19, 2015 by Rachel*

**PHYSICS**

Michael stands upright and allows his right arm to swing back and forth, naturally and without forcing, like a pendulum. He measures the time for 29 oscillations (complete cycles) to be 38.6 s. Assume his arm (length L) behaves as a simple pendulum, with an effective length of...
*Monday, October 19, 2015 by Caitlyn*

**Physics**

A tennis ball is thrown up in the air. It stays there for 12.1 seconds how fast did you throw it?
*Monday, October 19, 2015 by Anon*

**physics **

A duck waddles 2.3m east and 7.0m north. what are the magnitude and direction of the ducks displacement with respect to its original position?
*Monday, October 19, 2015 by bob*

**Physics 101 (I'm stupid)!**

And Astronaut wearing an environment suit has a total mass of 130 kg. What is his weight on earth? What would his weight be on Mars where the acceleration of gravity is 3.26? What is his mass on Mars? Why? If he should end up adrift and deep space what what his mask be? Why?
*Monday, October 19, 2015 by Haley*

**Physics 101 **

Calculate the increase in length of a 250.00 meter Long concrete bridge if its temperature increases from 10.0°C to 39.0°C? The coefficient of expansion of concrete is 9.8 X 10^-6 (1/°C)
*Monday, October 19, 2015 by Haley*

**Physics**

A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 8.60 cm. Through what arc length s does the 25.0-cm mark on the stick move? I have no clue what Im doing, I know S=tr but what is t?
*Monday, October 19, 2015 by Ashley *

**Physics**

A 20-kg child running at 1.4 m/s jumps onto a playground merry-go-round that has inertia 180 kg and radius 1.6 m. She is moving tangent to the platform when she jumps, and she lands right on the edge. Ignore any friction in the axle about which the platform rotates.
*Monday, October 19, 2015 by Ethan*

**Urgent physics help**

1. A runner starts at rest and accelerates uniformly at a rate of 0.85 m/s2 . What is the runner’s velocity after the runner has traveled 6.0 m? A. 2.3 m/s B. 3.2 m/s C. 5.1 m/s D. 10.2 m/s 2. An official drag race in the United States is usually 1/4 mile long, which is ...
*Monday, October 19, 2015 by Anonymous*

**Physics**

A child stands on a balcony directly above a friend 5.00 m below. Each throws a ball toward the other with the same initial speed of 10.0 m/s. If each catches a ball at the same instant, which child threw a ball first? How much later was the second ball thrown?
*Monday, October 19, 2015 by Bob*

**Physics**

A 1600 kg block of granite is pulled up an incline that has an angle of inclination θ = 20 ° with a constant speed of 1.21 m/s by a steam winch (see Figure). The coefficient of kinetic friction between the block and the incline is 0.09. How much power must be supplied...
*Monday, October 19, 2015 by Julia*

**PHYsics URGENT**

the deepest part of the ocean is 10,900 meters deep. a) calculate the absolute pressure at that depth in units N/m^2. Use the mass density of sea water, 1030 kg/m^3. see part b for more info b) one atmosphere of pressure is about 1.013 X 10^5 N.m^2. How many atmospheres is the...
*Monday, October 19, 2015 by sammie *

**physics**

how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule
*Monday, October 19, 2015 by sammie *

**Physics**

Michael Jordan has the record for the highest vertical jump at 48 inches (1.22m). While on the ground, he speeds up over a distance of 0.6 m to achieve the necessary launch speed. What acceleration does his legs provide in order to achieve his height? (Hint: you will need to ...
*Monday, October 19, 2015 by Joseph*

**physics**

a motorcycle initially moving at +32 m/s accelerates at -4.0 m/s for 3.0s. a car initially at rest accelerates at 4.0 m/s for 5.25 s. a) Which vehicle will be going faster at the end of each given time, and how much faster? b) how far does each vehicle travel during their ...
*Monday, October 19, 2015 by melanie*

**Physics**

I don't understand this at all! use the position equation s=-16t^2 +v0t+s0 to write a function that represents the situation. Find the average rate of change from t1 to t2. a) An object is thrown upward from a height of 6 feet at a velocity of 64 feet per second.... t1=0...
*Monday, October 19, 2015 by Julia*

**Physics-E&M**

8.1 Collision? A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a velocity ~v ⊥ B~ . A particle at rest with mass m and charge Q is on the path of the magnet. Assume that the magnet has a mass much larger ...
*Monday, October 19, 2015 by Ryan*

**Physics**

A bullet is fired from a rifle that is held 1.70 m above the ground in a horizontal position. The initial speed of the bullet is 1078 m/s. Calculate the time it takes for the bullet to strike the ground.
*Monday, October 19, 2015 by Julia*

**Physics**

two students working on physics assignment to find out how far window is from the roof of a building drop a ball over the edge of the roof the ball takes .1 seconds to travel from the top of the window to its bottom of a distance of 1 m assume the acceleration of gravity to be...
*Monday, October 19, 2015 by Caroline*

**physics**

vander waal b for oxygen is 32 cm3/mol compute the diameter of o2 molecule.
*Monday, October 19, 2015 by abdulmueed*

**physics**

Advantageous of 3pin plug over 2 pin plug
*Monday, October 19, 2015 by question*

**physics**

at what temprature is the average translational k.e of a molecule in an ideal gas equal to 1 ev?
*Monday, October 19, 2015 by abdulmueed*

**physics**

A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.35 m/s. Knowing that at the time of the release the balloon was 81.8 m above the ground, determine the time, τ, it takes the bag to reach the ground from the moment ...
*Monday, October 19, 2015 by abby*

**Physics**

In a downtown office building you notice each of the four sections of a rotating door has a mass of 85 kg. What is the width of each section of the door if a force of 62 N applied to the outer edge of a section produces an angular acceleration of 0.460 rad/s2?
*Monday, October 19, 2015 by Destiny *

**Physics**

A pitched ball is hit by a batter at a 40° angle and just clears the outfield fence, 106 m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. (Ignore air resistance)
*Sunday, October 18, 2015 by Kyle*

**Physics **

A crane lifts a 200kg load at a steady velocity.It takes 12s to raise the load through 60m. i) What is the power needed to lift the load if there is no friction? ii) What is the power needed if the friction force is constant at 170N?
*Sunday, October 18, 2015 by Hejumacal*

**PHYSICS**

Write down the ORDER OF MAGNITUDE for the numbers given: a)4.72*10^-7 b)8.65*10^4 C)7.59*10^-5
*Sunday, October 18, 2015 by HEJUMACLA*

**PHYSICS**

What is the force of attraction between two masses 5kg and 8kg at a distance of 60cm apart.
*Sunday, October 18, 2015 by COSMAS*

**Physics**

On a low-friction track, a 0.56-kg cart initially going at 1.85 m/s to the right collides with a cart of unknown inertia initially going at 2.17 m/s to the left. After the collision, the 0.56-kg cart is going at 1.32 m/s to the left, and the cart of unknown inertia is going at...
*Sunday, October 18, 2015 by aleisha*

**Physics**

Orville walks 330 m due east. He then continues walking along a straight line, but in a different direction, and stops 160 m northeast of his starting point. How far did he walk during the second portion of the trip and in what direction?
*Sunday, October 18, 2015 by Michael*

**AP physics**

A 65-kg skier starts at rest and slides 30 m down a hill inclined at 12∘ relative to the horizontal. Consider the force of friction on the skier to be negligible. Determine the speed of the skier after sliding 30 m downhill.
*Sunday, October 18, 2015 by JAde*

**physics**

A football is kicked with an initial velocity v=9i+12j. Find the speed in (m/s) of the ball after 2.4s A) 9.2 B) 10.8 C) 12 D) 15
*Sunday, October 18, 2015 by HEMANT*

**Physics **

A school boy walk 10 meter due west and afterward 15meter due south before reaching his school. Calculate the total distance and his displacement
*Sunday, October 18, 2015 by Amos rejoice *

**physics**

A piston of cross sectional area 100cm2 is used in hydraulic to exert a force of 10000000dyne find the cross area of another having weight 2000kg
*Sunday, October 18, 2015 by question*

**Physics**

A metal of block of mass 10kg lies on a rough plane, horizontal force of 8n applied to the block through it's centre of mass just slides the block on the plat form. What is the coefficient of limiting friction between the block and the plat form.
*Sunday, October 18, 2015 by Akumka patricia*

**physics**

In a phsics experiment, a 1.3 kg dynamics cart is placed on a ramp inclined at 25 degrees to the horizontal. the cart is initially at rest but is then pulled up the ramp with a force sensor. the force sensor exerts a force on the cart parallel to the ramp. negligible friction ...
*Sunday, October 18, 2015 by tim*

**physics**

from a roof top a rifle is fired with a steady blowing wind. The time interval between the flash and the report,observe at 1km away is 5seconds.find the velocity of sound in air
*Sunday, October 18, 2015 by kings.*

**physics**

suppose that the two person,each of mass 100kg are 3meter a part in outer space.what is the magnitude of the gravitational
*Sunday, October 18, 2015 by abdu*

**Physics**

Initially, a particle is moving at 4.00 m/s at an angle of 33.5 degrees above the horizontal. Two seconds later, its velocity is 6.45 m/s at an angle of 60.0 degrees below the horizontal. What was the particle's average acceleration during these 2.00 seconds? Enter the x ...
*Saturday, October 17, 2015 by Hailey*

**physics heat flow problems.**

b. Two metallic rods A and B with similar length and cross sectional area are joined together and all curved surfaces are insulated. At steady state, the temperatures at their ends are shown in the figure below. The thermal conductivity of A is twice that of B. Calculate the ...
*Saturday, October 17, 2015 by mais*