Monday

May 30, 2016
**physics**

if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?
*Monday, October 12, 2015 by carly*

**physics**

A 25-kg bullet traveling shoots into a physics textbook that is 3.5 cm wide, and exits the textbook traveling 40 m/s. Poor defenseless textbook! (A) What was the magnitude of the average deceleration of the bullet while it was penetrating through the textbook? (B) What was the...
*Monday, October 12, 2015 by Tiara*

**urgent physics help**

when the full moon directly overhead the angle from one edge of the moon to the other is measured to be 0.6970 if the diameter of the moon is 3650 km how far is it from the moon
*Monday, October 12, 2015 by Anonyomous *

**Physics**

An Object of mass 7 kg is pushed along a surface up to a velocity of + 10 m/s before it is let go. It then slows to a stop due to an 11-N frictional force. How long until it comes to a stop?
*Monday, October 12, 2015 by Erin*

**Physics**

A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.2. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror? If the object is inverted, then enter...
*Monday, October 12, 2015 by Anonymous*

**Physics**

An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 95 cm. (a) How far from the lens is the object...
*Monday, October 12, 2015 by Anonymous*

**Physics**

Can anyone help me here? I have no idea where to start! Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 35.1°. The slab is then immersed in a pool of liquid. When the angle of incidence for the light striking the slab is 21.1°, the ...
*Monday, October 12, 2015 by Anonymous*

**Physics **

A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south at a speed of 8.1 ...
*Monday, October 12, 2015 by Carla*

**Physics**

A car traveling at 40 m/s runs out of gas while traveling up a 7.0 ∘ slope How far will it coast before starting to roll back down?
*Monday, October 12, 2015 by raquel *

**Science - Physics **

Find the x-component of vector v⃗ = (310 m/s , 45 ∘ above +x-axis).
*Monday, October 12, 2015 by Shiv*

**Physics**

A particle rotates in a circle with centripetal acceleration a = 8.8 m/s2 . What is a if the radius is doubled without changing the particle's speed? What is a if the speed is doubled without changing the circle's radius?
*Monday, October 12, 2015 by Shiv*

**physics**

A 56-kg rollerblader skates across a skating rink floor. The graph below shows the net external force component F cos è along the displacement as a function of the magnitude of the displacement d. Determine the Following: (a) work done by the net force component F cos &...
*Monday, October 12, 2015 by John*

**Physics**

Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?
*Monday, October 12, 2015 by Kelly*

**Physics**

A 1300 kg El Camino is parked on a 20 degree hill.(20 degrees above x axis)The driver of the El Camino returns, starts the car, and accelerates up the hill at 2 m/s^2. Find Sigma-Fx and Sigma-Fy. What is the normal Force acting on the car, and what is the force being supplied ...
*Monday, October 12, 2015 by Jose Luis*

**Physics**

A colony of troglodytes has been in a lengthy feud with its neighbors on the adjacent cliff. Colony A finally develops an important military breakthrough: it rolls bombs off its cliff at known rates of speed, thus gaining pinpoint accuracy in its attacks. If the cliffs are ...
*Monday, October 12, 2015 by Luma*

**Physics**

A fireman, 43.7 m away from a burning building, directs a stream jet of water from a ground level fire hose at an angle of 31.3 degree above the horizontal. If the speed of the stream as it leaves the hose is 44.1 m/s, at what height will the stream of water strike the ...
*Monday, October 12, 2015 by Luma*

**Physics**

One of the fastest recorded pitches in major-league baseball, thrown by Nolan Ryan in 1974, was clocked at 96.8 mi/h. The acceleration of gravity is 32 ft/s^. If a pitch were thrown horizontally witha velocity of 96.8 mi/h, how far would the ball fall vertically by the time it...
*Monday, October 12, 2015 by Luma*

**Physics**

A spy in a speed boat is being chased down a river by government, officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both boats reach the edge of a 4.8 m waterfall. The spy's speed is 13 m/s and the officials' speed is 25 ...
*Monday, October 12, 2015 by Luma*

**Physics**

A pelican flying along a horizontal path drops a fish from a height of 3.3 m. The fish travels 8.2 m horizontally before it hits the water below. What was the pelican's initial speed? The acceleration of gravity is 9.81 m/s^. Answer in units of m/s. If the pelican was ...
*Monday, October 12, 2015 by Luma*

**Physics**

A body moving with uniform acceleration has a velocity of 16.9 cm/s when its x coordinate is 3.1 cm. If its x coordinate 3.18 s later is -4.72 cm, what is the x-component of its acceleration?
*Monday, October 12, 2015 by Destiny*

**Physics**

An autographed baseball rolls off of a 0.59 m high desk and strikes the floor 0.10 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s^ Answer in units of m/s.
*Monday, October 12, 2015 by Luma*

**Physics**

An artillery shell is fired at an angle of 26.8 degree above the horizontal ground with an initial speed of 1720 m/s. The acceleration of gravity is 9.8 m/s^. Find the total time of flight of the shell, neglecting air resistance. Answer in units of min. Find its horizontal ...
*Monday, October 12, 2015 by Luma*

**Physics**

A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker's foot is 17 m/s at angle of 35 degree above the horizontal. The top of the fence is 3 m high. The ball hits...
*Monday, October 12, 2015 by Luma*

**Physics**

A 64-kg boy and a 49-kg girl use an elastic rope while engaged in a tug-of-war on an icy frictionless surface. If the acceleration of the girl toward the boy is 3.8 m/s2, determine the magnitude of the acceleration of the boy toward the girl.
*Monday, October 12, 2015 by Chuck*

**PHYSICS**

A car travels at a constant speed around a circular track whose radius is 2.82 km. The car goes once around the track in 364 s. What is the magnitude of the centripetal acceleration of the car?
*Monday, October 12, 2015 by Anonymous*

**Physics**

Tammy leaves the office, drives 21 Km due north, then turns onto a second highway and continues in a direction of 31 degree north of east for 87 Km. What is her total displacement from the office? Answer in units of Km.
*Monday, October 12, 2015 by Luma*

**Mabel hill, physics**

Two force,3N and 4N act on a body in the direction due north and east respectively. Calculate their equilibrium?
*Monday, October 12, 2015 by Gift*

**Physics**

A girl delivering newspapers travels 3 blocks west, 3 blocks north, then 6 blocks east. What is the magnitude of her resultant displacement? Answer in units of blocks.
*Monday, October 12, 2015 by Luma*

**Physics**

What is the magnitude of the vertical component of velocity of the plane? Answer in units Km/h
*Monday, October 12, 2015 by Luma*

**Physics**

A truck travels beneath an airplane that is moving 140 Km/h at an angle of 15 degree to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of Km/h.
*Monday, October 12, 2015 by Luma*

**physics help**

The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q7 (b)give only the magnitude of the force that Q exerts on P (c)if Q Is now replaced by a ball that 1/2 its ...
*Monday, October 12, 2015 by kem*

**physics**

WHat is the displacement of a car that starts at 10m/s east and accelerates at 3m/s west for 2s
*Monday, October 12, 2015 by jolie*

**Physics **

A 60 kg is pushed 12m across a horizontal floor by a horizontal force of 200N. The coefficient of kinetic friction is 0.3. How much work went into overcoming friction and how much work went into accelerating the box.
*Monday, October 12, 2015 by Ali*

**Physics**

An Object moves along x-axis such that its position varies with time according to the relation x=50t-5t^2.Here x is in meters and t in seconds.Average Speed between t=0 to t=6s.
*Monday, October 12, 2015 by Jeet Shah*

**physics**

A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 8.0x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas? do I use the formula? T= (mv^2)/u No 3k
*Monday, October 12, 2015 by james *

**Physics**

The filament in an incandescent light bulb is made from tungsten (resistivity 5.6 x 10-8 Ù·m). The light bulb is plugged into a 120-V outlet and draws a current of 2.36 A. If the radius of the tungsten wire is 0.00464 mm, how long must the wire be? restivity of ...
*Monday, October 12, 2015 by james check please*

**Physics**

Identical +2.83 μC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total potential at the remaining empty corner is 0 V? φ =k•q/r φ1+ φ2 + φ3 =0...
*Monday, October 12, 2015 by james*

**Ap physics **

A ball rolls down an incline with an acceleration of 10 cm/s^2. If it starts with an initial velocity of 0 cm/s and has a velocy of 50 cm/s when it reaches the bottom of the ramp, how long is the ramp?
*Sunday, October 11, 2015 by Jasmine *

**physics**

A dart leaves the barrel of a blowgun at a speed v. The length of the blowgun barrel is L. Assume that the acceleration of the dart in the barrel is uniform. If the darts exit speed is 17 m/s and the length of the blowgun is 1.10 m, find the time the dart is in the barrel.
*Sunday, October 11, 2015 by nancy*

**Physics **

An Earth satellite moves in a circular orbit 765 km above the Earth's surface. The period of the motion is 99.9 min. (a) What is the speed of the satellite? ______ m/s (b) What is the magnitude of the centripetal acceleration of the satellite? ______m/s^2
*Sunday, October 11, 2015 by Corey*

**physics**

A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in ...
*Sunday, October 11, 2015 by jose *

**Physics**

When the Sun is directly overhead, a hawk dives toward the ground at a speed of 2.18 m/s. If the direction of his motion is at an angle of 25.1◦below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s
*Sunday, October 11, 2015 by Natasha*

**Physics**

A factory worker pushes a 32.0 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32 ∘ below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25. What magnitude of force must the ...
*Sunday, October 11, 2015 by octavio*

**physics**

"A 3.5 kg monket is suspended motionless 35 meter above the ground by holding two vines (a vertical vine and a diagonal vine)" We need to find the tension force in the diagonal vine as well as the angle of the diagonal vine with respect to the y axis. I'm having ...
*Sunday, October 11, 2015 by ana*

**Physics**

An explorer is stranded in the desert. A rescue service has located him using GPS, but can reach him only by plane. A supply package is kicked out the door of the plane while while it is flying at a speed of 61.7 m/s at an altitude of 35 m. Does the package fall straight down?
*Sunday, October 11, 2015 by Lindsey*

**physics**

The problem propmpts us with the info: "Two friends play with a card-board box on a grassy hill side. The boy in the box has a mass of 50.0 kg and the box has a mass of 5.00 kg. The incline of the hill is 44° and its height is 10 meter. Assume that friction plays a ...
*Sunday, October 11, 2015 by ana*

**physics**

A person takes a trip, driving with a constant speed of 93.5 km/h except for a 21.0 min rest stop. If the person's average speed is 69.8 km/h, how much time is spent on the trip and how far does the person travel?
*Sunday, October 11, 2015 by Emma *

**Physics**

A rocket has put your spacecraft in a circular orbit around Earth at an altitude of 350 km. Calculate the force due to gravitational between the Earth and the spacecraft in N if the mass of the spacecraft is 2450 kg.
*Sunday, October 11, 2015 by Kay*

**Physics**

A knight sits on a castle wall during a siege. To while away the time, he notes that boul- ders catapulted from below land on the top of his wall with a vertical velocity of 8.3 m/s. If he is 41 m above the catapult, what is the initial velocity of the boulders? The ...
*Sunday, October 11, 2015 by Chanelle*

**Physics**

A box has a weight of 120 N and is being pulled across a horizontal floor by a force that has a magnitude of 100 N. The pulling force can point horizontally, or it can point above the horizontal at an angle θ. When the pulling force points horizontally, the kinetic ...
*Sunday, October 11, 2015 by Erne*

**physics**

The driver of a car wishes to pass a truck that is traveling at a constant speed of 19.0 m/s . Initially, the car is also traveling at a speed 19.0 m/s and its front bumper is a distance 24.3 m behind the truck's rear bumper. The car begins accelerating at a constant ...
*Sunday, October 11, 2015 by elif*

**Physics**

A simple pendulum has a bob of mass M. The bob is on a light string of length l. The string is fixed at C. At position A, the string if horizontal and the bob is at rest. The bob is released from A and swings to B, where the string is vertical. The tension in the string when ...
*Sunday, October 11, 2015 by Kyle*

**Physics**

A 45 kg girl is sitting on one end of a see-saw, 0.6 m away from the the pivot pt. How far away form the pivot pt must a 60 kg boy sit on the other side in order for the see saw o be balanced?
*Sunday, October 11, 2015 by Hannah*

**Physics**

a uniform meter stick is at rotational equilibrium when 220 g is suspended at 5 com, 120 g is suspended at 90, and the support stand is placed at the 40 cm mark what is the mass of the meter stick?
*Sunday, October 11, 2015 by Hannah*

**physics help**

The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q answer F=Gm1m2/r^2 F=(6,67x10^-11)(55kg)(70kg)/(80cm) F=4.01x10^-11..... Is it correct is correct (b)give only the ...
*Sunday, October 11, 2015 by angel*

**physics help**

A block of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block. calculate the tension in the string.
*Sunday, October 11, 2015 by happy*

**Physics**

A child climbs up a set of stairs and reaches a height of 2.5m what is the child's gain I potential energy ?
*Sunday, October 11, 2015 by Caroline*

**Physics (Thin Film Interference)**

A layer of transparent plastic (n=1.61) on glass (n=1.52) looks dark when viewed in reflected light whose wavelength is 589 nanometers in vacuum. Find the two smallest possible nonzero values for the thickness of the layer. Answers are 183 nm and 366 but I don't understand...
*Sunday, October 11, 2015 by Richard*

**physics **

In the figure, a radar station detects an airplane approaching directly from the east. At first observation, the airplane is at distance d1 = 350 m from the station and at angle θ1 = 31° above the horizon. The airplane is tracked through an angular change Δθ...
*Sunday, October 11, 2015 by collins *

**physics **

Identical +2.83 μC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total potential at the remaining empty corner is 0 V? φ =k•q/r φ1+ φ2 + φ3 =0...
*Sunday, October 11, 2015 by james please check correct working*

**physics **

The filament in an incandescent light bulb is made from tungsten (resistivity 5.6 x 10-8 Ù·m). The light bulb is plugged into a 120-V outlet and draws a current of 2.36 A. If the radius of the tungsten wire is 0.00464 mm, how long must the wire be? restivity of ...
*Saturday, October 10, 2015 by james small help plz *

**Physics **

A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 8.0x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas? do I use the formula? T= (mv^2)/u No 3k
*Saturday, October 10, 2015 by james*

**PHYSICS**

A cart of weight 25 N is released at the top of an inclined plane of length 1m, which makes an angle of 30° with the ground. It rolls down the plane and hits another cart of weight 40 N at the bottom of the incline. Calculate the speed of the first cart at the bottom of ...
*Saturday, October 10, 2015 by VIPIN*

**Physics**

Two forces act on an object. The first force has a magnitude of 19.0 N and is oriented 58.0° counter-clockwise from the x axis, while the 2nd force has x- and y-components (-25.0 N, 16.5 N). Express the magnitude and direction of the net force.
*Saturday, October 10, 2015 by Lc*

**Physics**

Consider a train that rounds a curve with a radius of 574 m at a speed of 160 km/h. Calculate the friction force on the passenger if the train tilts at an angle of 8.0∘ toward the center of the curve.
*Saturday, October 10, 2015 by Kaity*

**physics, please help**

An object of mass m can slide without friction on a tabletop. A horizontal string tied to the object passes through a frictionless hole in the table and is connected to a second, hanging mass, M. If m is put into motion so that it moves in a circular path of radius r, find a) ...
*Saturday, October 10, 2015 by johnny*

**physics**

in the compton scattering event, the scattered photon has an energy of 120 keV and the recoiling e- has an energy of 40 keV. Find the wavelength of the photon.
*Saturday, October 10, 2015 by paul*

**Physics i need hlp i have exams next weeks that is why i post the question that which i cannot do**

The cost C of running a ship on a certain voyage is said to be given by c=av+b/v where v is the average speed in km/h and a,b are constant.find the value of v in terms of a and b to give the maximum cost,and also find the cost???
*Saturday, October 10, 2015 by Collins*

**Physics**

In a rescue, a 74.1 kg police officer is suspended by two cables, as shown in the figure. Cable A makes an angle θA = 32.0° with respect to the horizontal, and cable B, θB = 74.0°. Sketch a free body diagram. Calculate the tension in cable A.
*Saturday, October 10, 2015 by Carol*

**physics **

the velocity of a particle moving along the axis is given for t>0 by v=(32t -2t^3 ) m/s where t is in s what is the acceleration of a particle when (after t=0 ) it achieves its maximum displacement in the positive x direction
*Saturday, October 10, 2015 by nada*

**physics (Compton effect)**

need helppp. Find the energy of an x-ray photon that can impart a maximum energy of 50 keV to an electron by Compton collision. Max energy being Kinetic Energy? do I just plug the 50*10^3 eV (convert to J) into the E=h (c/lambda) equation?? We are not given theta, the incident...
*Saturday, October 10, 2015 by paul*

**Physics **

You can shoot an arrow straight up so that it reaches the top of a 25-m-t building. (a) How far will the arrow travel of you shoot it horizontally while pulling the bow in the same way? The arrow starts 1.45 m above the ground.(b) Where do you need to put a target that is 1.45...
*Saturday, October 10, 2015 by K*

**Physics**

A car decelerates uniformly and comes to a stop after 9 seconds. The car's average velocity during deceleration was 45 km/h. What was the cars deceleration while slowing down?
*Saturday, October 10, 2015 by Joe*

**physics**

Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Because of these accelerations, the pilots are subjected to forces that can be much greater than their body weight, leading to an accumulation of blood in the...
*Friday, October 9, 2015 by Regheim Beck*

**physics**

Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 427 km above the earth’s surface, while that for satellite B is at a height of 873 km. Find the orbital speed for (a) satellite A and (b) satellite B.
*Friday, October 9, 2015 by Regheim Beck*

**physics**

when starting a foot race a 66 kg sprinter exerts an average force of 640 N backward on the ground for 0.85s. What is his final speed in m/s?
*Friday, October 9, 2015 by Anonymous*

**Child development**

Infants' naïve theory of physics leads them to believe that a.gravity is not important so floating objects are not unusual. b.one object striking a second object does not affect the second object. c.objects cannot move through other objects. d.objects move along ...
*Friday, October 9, 2015 by Woody*

**Child development**

Infants' naïve theory of physics leads them to believe that A.gravity is not important so floating objects are not unusual. b.one object striking a second object does not affect the second object. c.objects cannot move through other objects. objects move along ...
*Friday, October 9, 2015 by Woody*

**physics**

a block of mass 5 kg is position at angle 45 degree ,a force of 10 newton is applied to the block parallel to the ground. is the coefficient of kinetic friction is 0.5 , calculate its acceleration?
*Friday, October 9, 2015 by Amna *

**Physics **

A bullet leaves a rifle with a velocity of 100 m/s and the rifle mass 2.5 kg recoils with a velocity of 1 m/s. Find the mass of the bullet. PLEASEEEE HELP ME.👏
*Friday, October 9, 2015 by Manan Bhattacharya*

**Physics/trig**

A fire hose ejects a stream of water at an angle of 33.6 ° above the horizontal. The water leaves the nozzle with a speed of 29.6 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
*Friday, October 9, 2015 by Jenna*

**physics**

On a plot of position x versus time t for an object’s motion, what corresponds to the object’s average velocity between instant t1 and instant t2? (a) intercept of the plot on the horizontal axis (b) intercept of the plot on the vertical axis (c) slope of a line ...
*Friday, October 9, 2015 by ahmed *

**Physics **

A player throws a ball at an initial velocity of 36 m/s. The maximum distance the ball can reach (assume ball is caught at the same height at which it was released) is? (I tried to solve it but i think it doesn't have all the information needed to slove it, but i'm not...
*Friday, October 9, 2015 by Yass*

**physics**

The elastic potential energy E is given by E=C p^2 g^2 A l0^3,where p is the density of the metal.g is the acceleration of free fall. A is the cross-sectional area of the wire and C is a constant. determine the si base units of C?
*Friday, October 9, 2015 by monique*

**physics**

gayle runs at a speed of 4.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill. after she has descended a vertical distance at a 5.00 m, her brother,who is initially at rest, hops on her back, and they continue down the hill together, ...
*Thursday, October 8, 2015 by naome*

**Physics**

A man runs east 9.8 m/s for 11 s, stops for 6.9 s, then runs back (west) at 1.5 m/s for 1.2 s. What is the man's average velocity?
*Thursday, October 8, 2015 by Sean *

**physics**

A hang glider pilot is flying horizontally over an open field when her shoe falls off. She was going 23.0 m/s and was 81.0 m above the ground. How long did it take for the shoe to hit the ground?
*Thursday, October 8, 2015 by sheri*

**Physics**

A ball thrown upward from the a point 7 meters below the bottom of a window rises past the window, which is 2.5 meters high, passing the window in 0.33 seconds. How fast was it going when it reached the bottom of the window, and with what velocity was it initially thrown upward?
*Thursday, October 8, 2015 by Anonymous*

**Physics**

You are standing on the roof of a building 300 m high, and throw a stone upward at 25 m/s. Find the speed of the stone as it strikes the ground.
*Thursday, October 8, 2015 by Jean-Paul*

**science- physics**

A position vector with magnitude 40 m points to the right and up. Its x-component is 32 m . What is the value of its y-component?
*Thursday, October 8, 2015 by Laura*

**Physics**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 37.1 m/s in a time of 6.28 s. The mass of the car and riders is 8.88 × 103 kg. Find the average net force exerted on the car and riders by the magnets.
*Thursday, October 8, 2015 by Natasha*

**Physics**

A plane flies at 220 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 2.8 x 105 m/h south. What is the velocity of the wind that affects the plane?
*Thursday, October 8, 2015 by Pip*

**physics **

A soccer ball accelerates from rest and rolls 6.5 meters down a hill in 3.1 seconds. It then bumps a tree. What is the speed of the ball right before it hits a tree?
*Thursday, October 8, 2015 by ashley*

**physics **

Block A (Mass = 2.319 kg) and Block B (Mass = 1.870 kg) are attached by a massless string as shown in the diagram. Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over (you guessed it) a frictionless, massless pulley...
*Thursday, October 8, 2015 by Carly*

**physics **

A 3.90 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1N at an angle theta=32.5degrees above the horizontal, as shown. a.) What is the magnitude of the acceleration of the block when the force is applied? b.) What is the ...
*Thursday, October 8, 2015 by Carly*

**Physics **

Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 38 kg, m2 = 37 kg, and m3 = 17 kg. a.) The pulling force is equal to T3 = 45 N. What is ...
*Thursday, October 8, 2015 by Carly*

**science- physics**

Find the x- and y-components of the vector d⃗ = (6.0 km , 31 ∘ left of +y-axis). I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.
*Thursday, October 8, 2015 by Laura*

**Physics**

a soccer ball is kicked and given an initial velocity of 12m/s at an angle of 30 degrees from the ground what's the velocity of the ball in the x axis
*Thursday, October 8, 2015 by Raesha*

**physics**

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. ...
*Thursday, October 8, 2015 by jovelyn trocio*

**physics help**

A block of wood experiences a normal force of 32 N from a rough,flat surface.there is a rope tied to the block.the rope is pulled parallel to the surface and the tension in the rope can be increased to 8 N before the block starts to slide. Determine the coefficient of static ...
*Thursday, October 8, 2015 by john*